11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD$"); 401556Srgrimes 41100437Stjr#include <paths.h> 4217987Speter#include <signal.h> 43102576Skeramida#include <stdlib.h> 4417987Speter#include <unistd.h> 45153091Sstefanf#include <sys/resource.h> 4645266Scracauer#include <sys/wait.h> /* For WIFSIGNALED(status) */ 4753891Scracauer#include <errno.h> 4817987Speter 491556Srgrimes/* 501556Srgrimes * Evaluate a command. 511556Srgrimes */ 521556Srgrimes 531556Srgrimes#include "shell.h" 541556Srgrimes#include "nodes.h" 551556Srgrimes#include "syntax.h" 561556Srgrimes#include "expand.h" 571556Srgrimes#include "parser.h" 581556Srgrimes#include "jobs.h" 591556Srgrimes#include "eval.h" 601556Srgrimes#include "builtins.h" 611556Srgrimes#include "options.h" 621556Srgrimes#include "exec.h" 631556Srgrimes#include "redir.h" 641556Srgrimes#include "input.h" 651556Srgrimes#include "output.h" 661556Srgrimes#include "trap.h" 671556Srgrimes#include "var.h" 681556Srgrimes#include "memalloc.h" 691556Srgrimes#include "error.h" 7017987Speter#include "show.h" 711556Srgrimes#include "mystring.h" 7217987Speter#ifndef NO_HISTORY 731556Srgrimes#include "myhistedit.h" 7417987Speter#endif 751556Srgrimes 761556Srgrimes 77201053Sjillesint evalskip; /* set if we are skipping commands */ 78230212Sdumbbellint skipcount; /* number of levels to skip */ 79253658Sjillesstatic int loopnest; /* current loop nesting level */ 801556Srgrimesint funcnest; /* depth of function calls */ 81213760Sobrienstatic int builtin_flags; /* evalcommand flags for builtins */ 821556Srgrimes 831556Srgrimes 841556Srgrimeschar *commandname; 851556Srgrimesstruct strlist *cmdenviron; 861556Srgrimesint exitstatus; /* exit status of last command */ 8717987Speterint oexitstatus; /* saved exit status */ 881556Srgrimes 891556Srgrimes 90213811Sobrienstatic void evalloop(union node *, int); 91213811Sobrienstatic void evalfor(union node *, int); 92230161Sjillesstatic union node *evalcase(union node *); 93213811Sobrienstatic void evalsubshell(union node *, int); 94213811Sobrienstatic void evalredir(union node *, int); 95246288Sjillesstatic void exphere(union node *, struct arglist *); 96213811Sobrienstatic void expredir(union node *); 97213811Sobrienstatic void evalpipe(union node *); 98216778Sjillesstatic int is_valid_fast_cmdsubst(union node *n); 99213811Sobrienstatic void evalcommand(union node *, int, struct backcmd *); 100213811Sobrienstatic void prehash(union node *); 1011556Srgrimes 1021556Srgrimes 1031556Srgrimes/* 1041556Srgrimes * Called to reset things after an exception. 1051556Srgrimes */ 1061556Srgrimes 107253650Sjillesvoid 108253650Sjillesreseteval(void) 109253650Sjilles{ 1101556Srgrimes evalskip = 0; 1111556Srgrimes loopnest = 0; 1121556Srgrimes} 1131556Srgrimes 1141556Srgrimes 1151556Srgrimes/* 11646684Skris * The eval command. 1171556Srgrimes */ 1181556Srgrimes 11917987Speterint 12090111Simpevalcmd(int argc, char **argv) 1211556Srgrimes{ 1221556Srgrimes char *p; 1231556Srgrimes char *concat; 1241556Srgrimes char **ap; 1251556Srgrimes 1261556Srgrimes if (argc > 1) { 1271556Srgrimes p = argv[1]; 1281556Srgrimes if (argc > 2) { 1291556Srgrimes STARTSTACKSTR(concat); 1301556Srgrimes ap = argv + 2; 1311556Srgrimes for (;;) { 132215783Sjilles STPUTS(p, concat); 1331556Srgrimes if ((p = *ap++) == NULL) 1341556Srgrimes break; 1351556Srgrimes STPUTC(' ', concat); 1361556Srgrimes } 1371556Srgrimes STPUTC('\0', concat); 1381556Srgrimes p = grabstackstr(concat); 1391556Srgrimes } 140223163Sjilles evalstring(p, builtin_flags); 141210829Sjilles } else 142210829Sjilles exitstatus = 0; 1431556Srgrimes return exitstatus; 1441556Srgrimes} 1451556Srgrimes 1461556Srgrimes 1471556Srgrimes/* 1481556Srgrimes * Execute a command or commands contained in a string. 1491556Srgrimes */ 1501556Srgrimes 1511556Srgrimesvoid 152193169Sstefanfevalstring(char *s, int flags) 15390111Simp{ 1541556Srgrimes union node *n; 1551556Srgrimes struct stackmark smark; 156194128Sjilles int flags_exit; 157210829Sjilles int any; 1581556Srgrimes 159194128Sjilles flags_exit = flags & EV_EXIT; 160194128Sjilles flags &= ~EV_EXIT; 161210829Sjilles any = 0; 1621556Srgrimes setstackmark(&smark); 1631556Srgrimes setinputstring(s, 1); 1641556Srgrimes while ((n = parsecmd(0)) != NEOF) { 165222676Sjilles if (n != NULL && !nflag) { 166194128Sjilles if (flags_exit && preadateof()) 167194128Sjilles evaltree(n, flags | EV_EXIT); 168194128Sjilles else 169194128Sjilles evaltree(n, flags); 170210829Sjilles any = 1; 171194128Sjilles } 1721556Srgrimes popstackmark(&smark); 173247013Sjilles setstackmark(&smark); 1741556Srgrimes } 1751556Srgrimes popfile(); 1761556Srgrimes popstackmark(&smark); 177210829Sjilles if (!any) 178210829Sjilles exitstatus = 0; 179194128Sjilles if (flags_exit) 180220978Sjilles exraise(EXEXIT); 1811556Srgrimes} 1821556Srgrimes 1831556Srgrimes 1841556Srgrimes/* 1851556Srgrimes * Evaluate a parse tree. The value is left in the global variable 1861556Srgrimes * exitstatus. 1871556Srgrimes */ 1881556Srgrimes 1891556Srgrimesvoid 19090111Simpevaltree(union node *n, int flags) 19117987Speter{ 192149927Sstefanf int do_etest; 193214599Sjilles union node *next; 194245698Sjilles struct stackmark smark; 195149927Sstefanf 196245698Sjilles setstackmark(&smark); 197149927Sstefanf do_etest = 0; 1981556Srgrimes if (n == NULL) { 1991556Srgrimes TRACE(("evaltree(NULL) called\n")); 2001556Srgrimes exitstatus = 0; 2011556Srgrimes goto out; 2021556Srgrimes } 203214599Sjilles do { 204214600Sjilles next = NULL; 20517987Speter#ifndef NO_HISTORY 206214600Sjilles displayhist = 1; /* show history substitutions done with fc */ 20717987Speter#endif 208214600Sjilles TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type)); 209214600Sjilles switch (n->type) { 210214600Sjilles case NSEMI: 211214600Sjilles evaltree(n->nbinary.ch1, flags & ~EV_EXIT); 212214600Sjilles if (evalskip) 213214600Sjilles goto out; 214214600Sjilles next = n->nbinary.ch2; 215214600Sjilles break; 216214600Sjilles case NAND: 217214600Sjilles evaltree(n->nbinary.ch1, EV_TESTED); 218214600Sjilles if (evalskip || exitstatus != 0) { 219214600Sjilles goto out; 220214600Sjilles } 221214600Sjilles next = n->nbinary.ch2; 222214600Sjilles break; 223214600Sjilles case NOR: 224214600Sjilles evaltree(n->nbinary.ch1, EV_TESTED); 225214600Sjilles if (evalskip || exitstatus == 0) 226214600Sjilles goto out; 227214600Sjilles next = n->nbinary.ch2; 228214600Sjilles break; 229214600Sjilles case NREDIR: 230214600Sjilles evalredir(n, flags); 231214600Sjilles break; 232214600Sjilles case NSUBSHELL: 233214600Sjilles evalsubshell(n, flags); 234214600Sjilles do_etest = !(flags & EV_TESTED); 235214600Sjilles break; 236214600Sjilles case NBACKGND: 237214600Sjilles evalsubshell(n, flags); 238214600Sjilles break; 239214600Sjilles case NIF: { 240214600Sjilles evaltree(n->nif.test, EV_TESTED); 241214600Sjilles if (evalskip) 242214600Sjilles goto out; 243214600Sjilles if (exitstatus == 0) 244214600Sjilles next = n->nif.ifpart; 245214600Sjilles else if (n->nif.elsepart) 246214600Sjilles next = n->nif.elsepart; 247214600Sjilles else 248214600Sjilles exitstatus = 0; 249214600Sjilles break; 25018754Ssteve } 251214600Sjilles case NWHILE: 252214600Sjilles case NUNTIL: 253214600Sjilles evalloop(n, flags & ~EV_EXIT); 254214600Sjilles break; 255214600Sjilles case NFOR: 256214600Sjilles evalfor(n, flags & ~EV_EXIT); 257214600Sjilles break; 258214600Sjilles case NCASE: 259230161Sjilles next = evalcase(n); 260214600Sjilles break; 261230161Sjilles case NCLIST: 262230161Sjilles next = n->nclist.body; 263230161Sjilles break; 264230161Sjilles case NCLISTFALLTHRU: 265230161Sjilles if (n->nclist.body) { 266230161Sjilles evaltree(n->nclist.body, flags & ~EV_EXIT); 267230161Sjilles if (evalskip) 268230161Sjilles goto out; 269230161Sjilles } 270230161Sjilles next = n->nclist.next; 271230161Sjilles break; 272214600Sjilles case NDEFUN: 273214600Sjilles defun(n->narg.text, n->narg.next); 27420425Ssteve exitstatus = 0; 275214600Sjilles break; 276214600Sjilles case NNOT: 277214600Sjilles evaltree(n->nnot.com, EV_TESTED); 278249407Sjilles if (evalskip) 279249407Sjilles goto out; 280214600Sjilles exitstatus = !exitstatus; 281214600Sjilles break; 2821556Srgrimes 283214600Sjilles case NPIPE: 284214600Sjilles evalpipe(n); 285214600Sjilles do_etest = !(flags & EV_TESTED); 286214600Sjilles break; 287214600Sjilles case NCMD: 288214600Sjilles evalcommand(n, flags, (struct backcmd *)NULL); 289214600Sjilles do_etest = !(flags & EV_TESTED); 290214600Sjilles break; 291214600Sjilles default: 292214600Sjilles out1fmt("Node type = %d\n", n->type); 293214600Sjilles flushout(&output); 294214600Sjilles break; 295214600Sjilles } 296214600Sjilles n = next; 297245698Sjilles popstackmark(&smark); 298247013Sjilles setstackmark(&smark); 299214599Sjilles } while (n != NULL); 3001556Srgrimesout: 301245698Sjilles popstackmark(&smark); 302247206Sjilles if (pendingsig) 3031556Srgrimes dotrap(); 304220978Sjilles if (eflag && exitstatus != 0 && do_etest) 3051556Srgrimes exitshell(exitstatus); 306220978Sjilles if (flags & EV_EXIT) 307220978Sjilles exraise(EXEXIT); 3081556Srgrimes} 3091556Srgrimes 3101556Srgrimes 311213811Sobrienstatic void 312149933Sstefanfevalloop(union node *n, int flags) 31317987Speter{ 3141556Srgrimes int status; 3151556Srgrimes 3161556Srgrimes loopnest++; 3171556Srgrimes status = 0; 3181556Srgrimes for (;;) { 3191556Srgrimes evaltree(n->nbinary.ch1, EV_TESTED); 3201556Srgrimes if (evalskip) { 3211556Srgrimesskipping: if (evalskip == SKIPCONT && --skipcount <= 0) { 3221556Srgrimes evalskip = 0; 3231556Srgrimes continue; 3241556Srgrimes } 3251556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3261556Srgrimes evalskip = 0; 327255215Sjilles if (evalskip == SKIPRETURN) 328212475Sjilles status = exitstatus; 3291556Srgrimes break; 3301556Srgrimes } 3311556Srgrimes if (n->type == NWHILE) { 3321556Srgrimes if (exitstatus != 0) 3331556Srgrimes break; 3341556Srgrimes } else { 3351556Srgrimes if (exitstatus == 0) 3361556Srgrimes break; 3371556Srgrimes } 338149933Sstefanf evaltree(n->nbinary.ch2, flags); 3391556Srgrimes status = exitstatus; 3401556Srgrimes if (evalskip) 3411556Srgrimes goto skipping; 3421556Srgrimes } 3431556Srgrimes loopnest--; 3441556Srgrimes exitstatus = status; 3451556Srgrimes} 3461556Srgrimes 3471556Srgrimes 3481556Srgrimes 349213811Sobrienstatic void 350149933Sstefanfevalfor(union node *n, int flags) 35117987Speter{ 3521556Srgrimes struct arglist arglist; 3531556Srgrimes union node *argp; 3541556Srgrimes struct strlist *sp; 355230463Sjilles int status; 3561556Srgrimes 3571556Srgrimes arglist.lastp = &arglist.list; 3581556Srgrimes for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { 35917987Speter oexitstatus = exitstatus; 3601556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 3611556Srgrimes } 3621556Srgrimes *arglist.lastp = NULL; 3631556Srgrimes 3641556Srgrimes loopnest++; 365230463Sjilles status = 0; 3661556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 3671556Srgrimes setvar(n->nfor.var, sp->text, 0); 368149933Sstefanf evaltree(n->nfor.body, flags); 369230463Sjilles status = exitstatus; 3701556Srgrimes if (evalskip) { 3711556Srgrimes if (evalskip == SKIPCONT && --skipcount <= 0) { 3721556Srgrimes evalskip = 0; 3731556Srgrimes continue; 3741556Srgrimes } 3751556Srgrimes if (evalskip == SKIPBREAK && --skipcount <= 0) 3761556Srgrimes evalskip = 0; 3771556Srgrimes break; 3781556Srgrimes } 3791556Srgrimes } 3801556Srgrimes loopnest--; 381230463Sjilles exitstatus = status; 3821556Srgrimes} 3831556Srgrimes 3841556Srgrimes 385230161Sjilles/* 386230161Sjilles * Evaluate a case statement, returning the selected tree. 387230161Sjilles * 388230161Sjilles * The exit status needs care to get right. 389230161Sjilles */ 3901556Srgrimes 391228013Sjillesstatic union node * 392230161Sjillesevalcase(union node *n) 39317987Speter{ 3941556Srgrimes union node *cp; 3951556Srgrimes union node *patp; 3961556Srgrimes struct arglist arglist; 3971556Srgrimes 3981556Srgrimes arglist.lastp = &arglist.list; 39917987Speter oexitstatus = exitstatus; 4001556Srgrimes expandarg(n->ncase.expr, &arglist, EXP_TILDE); 401228013Sjilles for (cp = n->ncase.cases ; cp ; cp = cp->nclist.next) { 4021556Srgrimes for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { 4031556Srgrimes if (casematch(patp, arglist.list->text)) { 404223186Sjilles while (cp->nclist.next && 405230161Sjilles cp->type == NCLISTFALLTHRU && 406230161Sjilles cp->nclist.body == NULL) 407223186Sjilles cp = cp->nclist.next; 408230161Sjilles if (cp->nclist.next && 409230161Sjilles cp->type == NCLISTFALLTHRU) 410230161Sjilles return (cp); 411230154Sjilles if (cp->nclist.body == NULL) 412230154Sjilles exitstatus = 0; 413228013Sjilles return (cp->nclist.body); 4141556Srgrimes } 4151556Srgrimes } 4161556Srgrimes } 417230154Sjilles exitstatus = 0; 418228013Sjilles return (NULL); 4191556Srgrimes} 4201556Srgrimes 4211556Srgrimes 4221556Srgrimes 4231556Srgrimes/* 4241556Srgrimes * Kick off a subshell to evaluate a tree. 4251556Srgrimes */ 4261556Srgrimes 427213811Sobrienstatic void 42890111Simpevalsubshell(union node *n, int flags) 42917987Speter{ 4301556Srgrimes struct job *jp; 4311556Srgrimes int backgnd = (n->type == NBACKGND); 4321556Srgrimes 433222716Sjilles oexitstatus = exitstatus; 4341556Srgrimes expredir(n->nredir.redirect); 435194774Sjilles if ((!backgnd && flags & EV_EXIT && !have_traps()) || 436194774Sjilles forkshell(jp = makejob(n, 1), n, backgnd) == 0) { 4371556Srgrimes if (backgnd) 4381556Srgrimes flags &=~ EV_TESTED; 4391556Srgrimes redirect(n->nredir.redirect, 0); 4401556Srgrimes evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ 441201053Sjilles } else if (! backgnd) { 4421556Srgrimes INTOFF; 44345916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 4441556Srgrimes INTON; 445221027Sjilles } else 446221027Sjilles exitstatus = 0; 4471556Srgrimes} 4481556Srgrimes 4491556Srgrimes 450205154Sjilles/* 451205154Sjilles * Evaluate a redirected compound command. 452205154Sjilles */ 4531556Srgrimes 454213811Sobrienstatic void 455205154Sjillesevalredir(union node *n, int flags) 456205154Sjilles{ 457205154Sjilles struct jmploc jmploc; 458205154Sjilles struct jmploc *savehandler; 459205154Sjilles volatile int in_redirect = 1; 460205154Sjilles 461222716Sjilles oexitstatus = exitstatus; 462205154Sjilles expredir(n->nredir.redirect); 463205154Sjilles savehandler = handler; 464205154Sjilles if (setjmp(jmploc.loc)) { 465205154Sjilles int e; 466205154Sjilles 467205154Sjilles handler = savehandler; 468205154Sjilles e = exception; 469220978Sjilles popredir(); 470205154Sjilles if (e == EXERROR || e == EXEXEC) { 471205154Sjilles if (in_redirect) { 472205154Sjilles exitstatus = 2; 473205154Sjilles return; 474205154Sjilles } 475205154Sjilles } 476205154Sjilles longjmp(handler->loc, 1); 477205154Sjilles } else { 478205154Sjilles INTOFF; 479205154Sjilles handler = &jmploc; 480205154Sjilles redirect(n->nredir.redirect, REDIR_PUSH); 481205154Sjilles in_redirect = 0; 482205154Sjilles INTON; 483205154Sjilles evaltree(n->nredir.n, flags); 484205154Sjilles } 485205154Sjilles INTOFF; 486205154Sjilles handler = savehandler; 487205154Sjilles popredir(); 488205154Sjilles INTON; 489205154Sjilles} 490205154Sjilles 491205154Sjilles 492246288Sjillesstatic void 493246288Sjillesexphere(union node *redir, struct arglist *fn) 494246288Sjilles{ 495246288Sjilles struct jmploc jmploc; 496246288Sjilles struct jmploc *savehandler; 497246288Sjilles struct localvar *savelocalvars; 498246288Sjilles int need_longjmp = 0; 499246288Sjilles 500246288Sjilles redir->nhere.expdoc = nullstr; 501246288Sjilles savelocalvars = localvars; 502246288Sjilles localvars = NULL; 503246288Sjilles forcelocal++; 504246288Sjilles savehandler = handler; 505246288Sjilles if (setjmp(jmploc.loc)) 506246288Sjilles need_longjmp = exception != EXERROR && exception != EXEXEC; 507246288Sjilles else { 508246288Sjilles handler = &jmploc; 509246288Sjilles expandarg(redir->nhere.doc, fn, 0); 510246288Sjilles redir->nhere.expdoc = fn->list->text; 511246288Sjilles INTOFF; 512246288Sjilles } 513246288Sjilles handler = savehandler; 514246288Sjilles forcelocal--; 515246288Sjilles poplocalvars(); 516246288Sjilles localvars = savelocalvars; 517246288Sjilles if (need_longjmp) 518246288Sjilles longjmp(handler->loc, 1); 519246288Sjilles INTON; 520246288Sjilles} 521246288Sjilles 522246288Sjilles 5231556Srgrimes/* 5241556Srgrimes * Compute the names of the files in a redirection list. 5251556Srgrimes */ 5261556Srgrimes 527213811Sobrienstatic void 52890111Simpexpredir(union node *n) 52917987Speter{ 53025222Ssteve union node *redir; 5311556Srgrimes 5321556Srgrimes for (redir = n ; redir ; redir = redir->nfile.next) { 53317987Speter struct arglist fn; 53417987Speter fn.lastp = &fn.list; 53517987Speter switch (redir->type) { 53617987Speter case NFROM: 53717987Speter case NTO: 53866612Sbrian case NFROMTO: 53917987Speter case NAPPEND: 54096922Stjr case NCLOBBER: 5411556Srgrimes expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); 5421556Srgrimes redir->nfile.expfname = fn.list->text; 54317987Speter break; 54417987Speter case NFROMFD: 54517987Speter case NTOFD: 54617987Speter if (redir->ndup.vname) { 547181017Sstefanf expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR); 54817987Speter fixredir(redir, fn.list->text, 1); 54917987Speter } 55017987Speter break; 551246288Sjilles case NXHERE: 552246288Sjilles exphere(redir, &fn); 553246288Sjilles break; 5541556Srgrimes } 5551556Srgrimes } 5561556Srgrimes} 5571556Srgrimes 5581556Srgrimes 5591556Srgrimes 5601556Srgrimes/* 5611556Srgrimes * Evaluate a pipeline. All the processes in the pipeline are children 5621556Srgrimes * of the process creating the pipeline. (This differs from some versions 5631556Srgrimes * of the shell, which make the last process in a pipeline the parent 5641556Srgrimes * of all the rest.) 5651556Srgrimes */ 5661556Srgrimes 567213811Sobrienstatic void 56890111Simpevalpipe(union node *n) 56917987Speter{ 5701556Srgrimes struct job *jp; 5711556Srgrimes struct nodelist *lp; 5721556Srgrimes int pipelen; 5731556Srgrimes int prevfd; 5741556Srgrimes int pip[2]; 5751556Srgrimes 576149802Sstefanf TRACE(("evalpipe(%p) called\n", (void *)n)); 5771556Srgrimes pipelen = 0; 5781556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) 5791556Srgrimes pipelen++; 5801556Srgrimes INTOFF; 5811556Srgrimes jp = makejob(n, pipelen); 5821556Srgrimes prevfd = -1; 5831556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 5841556Srgrimes prehash(lp->n); 5851556Srgrimes pip[1] = -1; 5861556Srgrimes if (lp->next) { 5871556Srgrimes if (pipe(pip) < 0) { 588252359Sjilles if (prevfd >= 0) 589252359Sjilles close(prevfd); 59053891Scracauer error("Pipe call failed: %s", strerror(errno)); 5911556Srgrimes } 5921556Srgrimes } 5931556Srgrimes if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { 5941556Srgrimes INTON; 5951556Srgrimes if (prevfd > 0) { 596124780Sdes dup2(prevfd, 0); 5971556Srgrimes close(prevfd); 5981556Srgrimes } 5991556Srgrimes if (pip[1] >= 0) { 60053282Scracauer if (!(prevfd >= 0 && pip[0] == 0)) 60152900Scracauer close(pip[0]); 6021556Srgrimes if (pip[1] != 1) { 603124780Sdes dup2(pip[1], 1); 6041556Srgrimes close(pip[1]); 6051556Srgrimes } 6061556Srgrimes } 6071556Srgrimes evaltree(lp->n, EV_EXIT); 6081556Srgrimes } 6091556Srgrimes if (prevfd >= 0) 6101556Srgrimes close(prevfd); 6111556Srgrimes prevfd = pip[0]; 612221970Sjilles if (pip[1] != -1) 613221970Sjilles close(pip[1]); 6141556Srgrimes } 6151556Srgrimes INTON; 6161556Srgrimes if (n->npipe.backgnd == 0) { 6171556Srgrimes INTOFF; 61845916Scracauer exitstatus = waitforjob(jp, (int *)NULL); 6191556Srgrimes TRACE(("evalpipe: job done exit status %d\n", exitstatus)); 6201556Srgrimes INTON; 621221027Sjilles } else 622221027Sjilles exitstatus = 0; 6231556Srgrimes} 6241556Srgrimes 6251556Srgrimes 6261556Srgrimes 627216778Sjillesstatic int 628216778Sjillesis_valid_fast_cmdsubst(union node *n) 629216778Sjilles{ 630216778Sjilles 631223024Sjilles return (n->type == NCMD); 632216778Sjilles} 633216778Sjilles 6341556Srgrimes/* 6351556Srgrimes * Execute a command inside back quotes. If it's a builtin command, we 6361556Srgrimes * want to save its output in a block obtained from malloc. Otherwise 6371556Srgrimes * we fork off a subprocess and get the output of the command via a pipe. 6381556Srgrimes * Should be called with interrupts off. 6391556Srgrimes */ 6401556Srgrimes 6411556Srgrimesvoid 64290111Simpevalbackcmd(union node *n, struct backcmd *result) 64317987Speter{ 6441556Srgrimes int pip[2]; 6451556Srgrimes struct job *jp; 646245698Sjilles struct stackmark smark; 647216761Sjilles struct jmploc jmploc; 648216761Sjilles struct jmploc *savehandler; 649223024Sjilles struct localvar *savelocalvars; 6501556Srgrimes 6511556Srgrimes setstackmark(&smark); 6521556Srgrimes result->fd = -1; 6531556Srgrimes result->buf = NULL; 6541556Srgrimes result->nleft = 0; 6551556Srgrimes result->jp = NULL; 65617987Speter if (n == NULL) { 65717987Speter exitstatus = 0; 6581556Srgrimes goto out; 65917987Speter } 660245422Sjilles exitstatus = oexitstatus; 661216778Sjilles if (is_valid_fast_cmdsubst(n)) { 662223024Sjilles savelocalvars = localvars; 663223024Sjilles localvars = NULL; 664223024Sjilles forcelocal++; 665216761Sjilles savehandler = handler; 666216761Sjilles if (setjmp(jmploc.loc)) { 667216761Sjilles if (exception == EXERROR || exception == EXEXEC) 668216761Sjilles exitstatus = 2; 669216761Sjilles else if (exception != 0) { 670216761Sjilles handler = savehandler; 671223024Sjilles forcelocal--; 672223024Sjilles poplocalvars(); 673223024Sjilles localvars = savelocalvars; 674216761Sjilles longjmp(handler->loc, 1); 675216761Sjilles } 676216761Sjilles } else { 677216761Sjilles handler = &jmploc; 678216761Sjilles evalcommand(n, EV_BACKCMD, result); 679216761Sjilles } 680216761Sjilles handler = savehandler; 681223024Sjilles forcelocal--; 682223024Sjilles poplocalvars(); 683223024Sjilles localvars = savelocalvars; 6841556Srgrimes } else { 6851556Srgrimes if (pipe(pip) < 0) 68653891Scracauer error("Pipe call failed: %s", strerror(errno)); 6871556Srgrimes jp = makejob(n, 1); 6881556Srgrimes if (forkshell(jp, n, FORK_NOJOB) == 0) { 6891556Srgrimes FORCEINTON; 6901556Srgrimes close(pip[0]); 6911556Srgrimes if (pip[1] != 1) { 692124780Sdes dup2(pip[1], 1); 6931556Srgrimes close(pip[1]); 6941556Srgrimes } 6951556Srgrimes evaltree(n, EV_EXIT); 6961556Srgrimes } 6971556Srgrimes close(pip[1]); 6981556Srgrimes result->fd = pip[0]; 6991556Srgrimes result->jp = jp; 7001556Srgrimes } 7011556Srgrimesout: 7021556Srgrimes popstackmark(&smark); 703109627Stjr TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n", 7041556Srgrimes result->fd, result->buf, result->nleft, result->jp)); 7051556Srgrimes} 7061556Srgrimes 707238468Sjillesstatic int 708238468Sjillesmustexpandto(const char *argtext, const char *mask) 709238468Sjilles{ 710238468Sjilles for (;;) { 711238468Sjilles if (*argtext == CTLQUOTEMARK || *argtext == CTLQUOTEEND) { 712238468Sjilles argtext++; 713238468Sjilles continue; 714238468Sjilles } 715238468Sjilles if (*argtext == CTLESC) 716238468Sjilles argtext++; 717238468Sjilles else if (BASESYNTAX[(int)*argtext] == CCTL) 718238468Sjilles return (0); 719238468Sjilles if (*argtext != *mask) 720238468Sjilles return (0); 721238468Sjilles if (*argtext == '\0') 722238468Sjilles return (1); 723238468Sjilles argtext++; 724238468Sjilles mask++; 725238468Sjilles } 726238468Sjilles} 727238468Sjilles 728238468Sjillesstatic int 729238468Sjillesisdeclarationcmd(struct narg *arg) 730238468Sjilles{ 731238468Sjilles int have_command = 0; 732238468Sjilles 733238468Sjilles if (arg == NULL) 734238468Sjilles return (0); 735238468Sjilles while (mustexpandto(arg->text, "command")) { 736238468Sjilles have_command = 1; 737238468Sjilles arg = &arg->next->narg; 738238468Sjilles if (arg == NULL) 739238468Sjilles return (0); 740238468Sjilles /* 741238468Sjilles * To also allow "command -p" and "command --" as part of 742238468Sjilles * a declaration command, add code here. 743238468Sjilles * We do not do this, as ksh does not do it either and it 744238468Sjilles * is not required by POSIX. 745238468Sjilles */ 746238468Sjilles } 747238468Sjilles return (mustexpandto(arg->text, "export") || 748238468Sjilles mustexpandto(arg->text, "readonly") || 749238468Sjilles (mustexpandto(arg->text, "local") && 750238468Sjilles (have_command || !isfunc("local")))); 751238468Sjilles} 752238468Sjilles 753262951Sjmmvstatic void 754262951Sjmmvxtracecommand(struct arglist *varlist, struct arglist *arglist) 755262951Sjmmv{ 756262951Sjmmv struct strlist *sp; 757262951Sjmmv char sep = 0; 758262951Sjmmv const char *p, *ps4; 759262951Sjmmv 760262951Sjmmv ps4 = expandstr(ps4val()); 761262951Sjmmv out2str(ps4 != NULL ? ps4 : ps4val()); 762262951Sjmmv for (sp = varlist->list ; sp ; sp = sp->next) { 763262951Sjmmv if (sep != 0) 764262951Sjmmv out2c(' '); 765262951Sjmmv p = strchr(sp->text, '='); 766262951Sjmmv if (p != NULL) { 767262951Sjmmv p++; 768262951Sjmmv outbin(sp->text, p - sp->text, out2); 769262951Sjmmv out2qstr(p); 770262951Sjmmv } else 771262951Sjmmv out2qstr(sp->text); 772262951Sjmmv sep = ' '; 773262951Sjmmv } 774262951Sjmmv for (sp = arglist->list ; sp ; sp = sp->next) { 775262951Sjmmv if (sep != 0) 776262951Sjmmv out2c(' '); 777262951Sjmmv /* Disambiguate command looking like assignment. */ 778262951Sjmmv if (sp == arglist->list && 779262951Sjmmv strchr(sp->text, '=') != NULL && 780262951Sjmmv strchr(sp->text, '\'') == NULL) { 781262951Sjmmv out2c('\''); 782262951Sjmmv out2str(sp->text); 783262951Sjmmv out2c('\''); 784262951Sjmmv } else 785262951Sjmmv out2qstr(sp->text); 786262951Sjmmv sep = ' '; 787262951Sjmmv } 788262951Sjmmv out2c('\n'); 789262951Sjmmv flushout(&errout); 790262951Sjmmv} 791262951Sjmmv 792216826Sjilles/* 793216826Sjilles * Check if a builtin can safely be executed in the same process, 794216826Sjilles * even though it should be in a subshell (command substitution). 795216826Sjilles * Note that jobid, jobs, times and trap can show information not 796216826Sjilles * available in a child process; this is deliberate. 797216826Sjilles * The arguments should already have been expanded. 798216826Sjilles */ 799216826Sjillesstatic int 800216826Sjillessafe_builtin(int idx, int argc, char **argv) 801216826Sjilles{ 802216826Sjilles if (idx == BLTINCMD || idx == COMMANDCMD || idx == ECHOCMD || 803216826Sjilles idx == FALSECMD || idx == JOBIDCMD || idx == JOBSCMD || 804216826Sjilles idx == KILLCMD || idx == PRINTFCMD || idx == PWDCMD || 805216826Sjilles idx == TESTCMD || idx == TIMESCMD || idx == TRUECMD || 806216826Sjilles idx == TYPECMD) 807216826Sjilles return (1); 808216826Sjilles if (idx == EXPORTCMD || idx == TRAPCMD || idx == ULIMITCMD || 809216826Sjilles idx == UMASKCMD) 810216826Sjilles return (argc <= 1 || (argc == 2 && argv[1][0] == '-')); 811216826Sjilles if (idx == SETCMD) 812216826Sjilles return (argc <= 1 || (argc == 2 && (argv[1][0] == '-' || 813216826Sjilles argv[1][0] == '+') && argv[1][1] == 'o' && 814216826Sjilles argv[1][2] == '\0')); 815216826Sjilles return (0); 816216826Sjilles} 8171556Srgrimes 8181556Srgrimes/* 8191556Srgrimes * Execute a simple command. 820217035Sjilles * Note: This may or may not return if (flags & EV_EXIT). 8211556Srgrimes */ 8221556Srgrimes 823213811Sobrienstatic void 82490111Simpevalcommand(union node *cmd, int flags, struct backcmd *backcmd) 82517987Speter{ 8261556Srgrimes union node *argp; 8271556Srgrimes struct arglist arglist; 8281556Srgrimes struct arglist varlist; 8291556Srgrimes char **argv; 8301556Srgrimes int argc; 8311556Srgrimes char **envp; 8321556Srgrimes int varflag; 8331556Srgrimes struct strlist *sp; 8341556Srgrimes int mode; 8351556Srgrimes int pip[2]; 8361556Srgrimes struct cmdentry cmdentry; 8371556Srgrimes struct job *jp; 8381556Srgrimes struct jmploc jmploc; 839194765Sjilles struct jmploc *savehandler; 840194765Sjilles char *savecmdname; 841194765Sjilles struct shparam saveparam; 842194765Sjilles struct localvar *savelocalvars; 843199647Sjilles struct parsefile *savetopfile; 8441556Srgrimes volatile int e; 8451556Srgrimes char *lastarg; 84645916Scracauer int realstatus; 84754884Scracauer int do_clearcmdentry; 848211287Sjilles const char *path = pathval(); 8491556Srgrimes 8501556Srgrimes /* First expand the arguments. */ 851149802Sstefanf TRACE(("evalcommand(%p, %d) called\n", (void *)cmd, flags)); 8521556Srgrimes arglist.lastp = &arglist.list; 8531556Srgrimes varlist.lastp = &varlist.list; 8541556Srgrimes varflag = 1; 855217035Sjilles jp = NULL; 85654884Scracauer do_clearcmdentry = 0; 85717987Speter oexitstatus = exitstatus; 85817987Speter exitstatus = 0; 8591556Srgrimes for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { 860222165Sjilles if (varflag && isassignment(argp->narg.text)) { 861238468Sjilles expandarg(argp, varflag == 1 ? &varlist : &arglist, 862238468Sjilles EXP_VARTILDE); 863222165Sjilles continue; 864238468Sjilles } else if (varflag == 1) 865238468Sjilles varflag = isdeclarationcmd(&argp->narg) ? 2 : 0; 8661556Srgrimes expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); 8671556Srgrimes } 8681556Srgrimes *arglist.lastp = NULL; 8691556Srgrimes *varlist.lastp = NULL; 8701556Srgrimes expredir(cmd->ncmd.redirect); 8711556Srgrimes argc = 0; 8721556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) 8731556Srgrimes argc++; 874218306Sjilles /* Add one slot at the beginning for tryexec(). */ 875218306Sjilles argv = stalloc(sizeof (char *) * (argc + 2)); 876218306Sjilles argv++; 8771556Srgrimes 8781556Srgrimes for (sp = arglist.list ; sp ; sp = sp->next) { 8791556Srgrimes TRACE(("evalcommand arg: %s\n", sp->text)); 8801556Srgrimes *argv++ = sp->text; 8811556Srgrimes } 8821556Srgrimes *argv = NULL; 8831556Srgrimes lastarg = NULL; 8841556Srgrimes if (iflag && funcnest == 0 && argc > 0) 8851556Srgrimes lastarg = argv[-1]; 8861556Srgrimes argv -= argc; 8871556Srgrimes 8881556Srgrimes /* Print the command if xflag is set. */ 889262951Sjmmv if (xflag) 890262951Sjmmv xtracecommand(&varlist, &arglist); 8911556Srgrimes 8921556Srgrimes /* Now locate the command. */ 8931556Srgrimes if (argc == 0) { 894157601Sstefanf /* Variable assignment(s) without command */ 8951556Srgrimes cmdentry.cmdtype = CMDBUILTIN; 8961556Srgrimes cmdentry.u.index = BLTINCMD; 897205138Sjilles cmdentry.special = 0; 8981556Srgrimes } else { 89917987Speter static const char PATH[] = "PATH="; 900204800Sjilles int cmd_flags = 0, bltinonly = 0; 90117987Speter 90217987Speter /* 90317987Speter * Modify the command lookup path, if a PATH= assignment 90417987Speter * is present 90517987Speter */ 90617987Speter for (sp = varlist.list ; sp ; sp = sp->next) 90754884Scracauer if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) { 90817987Speter path = sp->text + sizeof(PATH) - 1; 909155301Sschweikh /* 91054884Scracauer * On `PATH=... command`, we need to make 91154884Scracauer * sure that the command isn't using the 91254884Scracauer * non-updated hash table of the outer PATH 913155301Sschweikh * setting and we need to make sure that 91454884Scracauer * the hash table isn't filled with items 91554884Scracauer * from the temporary setting. 91654884Scracauer * 917155301Sschweikh * It would be better to forbit using and 91854884Scracauer * updating the table while this command 91954884Scracauer * runs, by the command finding mechanism 92054884Scracauer * is heavily integrated with hash handling, 92154884Scracauer * so we just delete the hash before and after 92254884Scracauer * the command runs. Partly deleting like 92354884Scracauer * changepatch() does doesn't seem worth the 92454884Scracauer * bookinging effort, since most such runs add 925123996Smaxim * directories in front of the new PATH. 92654884Scracauer */ 927218324Sjilles clearcmdentry(); 92854884Scracauer do_clearcmdentry = 1; 92954884Scracauer } 93017987Speter 931204800Sjilles for (;;) { 932204800Sjilles if (bltinonly) { 933204800Sjilles cmdentry.u.index = find_builtin(*argv, &cmdentry.special); 934204800Sjilles if (cmdentry.u.index < 0) { 935201431Sjilles cmdentry.u.index = BLTINCMD; 936201431Sjilles argv--; 937201431Sjilles argc++; 938201431Sjilles break; 9391556Srgrimes } 940204800Sjilles } else 941204800Sjilles find_command(argv[0], &cmdentry, cmd_flags, path); 942204800Sjilles /* implement the bltin and command builtins here */ 943204800Sjilles if (cmdentry.cmdtype != CMDBUILTIN) 944204800Sjilles break; 945204800Sjilles if (cmdentry.u.index == BLTINCMD) { 946204800Sjilles if (argc == 1) 9471556Srgrimes break; 948204800Sjilles argv++; 949204800Sjilles argc--; 950204800Sjilles bltinonly = 1; 951204800Sjilles } else if (cmdentry.u.index == COMMANDCMD) { 952204800Sjilles if (argc == 1) 953204800Sjilles break; 954204800Sjilles if (!strcmp(argv[1], "-p")) { 955204800Sjilles if (argc == 2) 956204800Sjilles break; 957204800Sjilles if (argv[2][0] == '-') { 958204800Sjilles if (strcmp(argv[2], "--")) 959204800Sjilles break; 960204800Sjilles if (argc == 3) 961204800Sjilles break; 962204800Sjilles argv += 3; 963204800Sjilles argc -= 3; 964204800Sjilles } else { 965204800Sjilles argv += 2; 966204800Sjilles argc -= 2; 967204800Sjilles } 968204800Sjilles path = _PATH_STDPATH; 969218324Sjilles clearcmdentry(); 970204800Sjilles do_clearcmdentry = 1; 971204800Sjilles } else if (!strcmp(argv[1], "--")) { 972204800Sjilles if (argc == 2) 973204800Sjilles break; 974204800Sjilles argv += 2; 975204800Sjilles argc -= 2; 976204800Sjilles } else if (argv[1][0] == '-') 977204800Sjilles break; 978204800Sjilles else { 979204800Sjilles argv++; 980204800Sjilles argc--; 981204800Sjilles } 982204800Sjilles cmd_flags |= DO_NOFUNC; 983204800Sjilles bltinonly = 0; 984204800Sjilles } else 985204800Sjilles break; 9861556Srgrimes } 987204800Sjilles /* 988204800Sjilles * Special builtins lose their special properties when 989204800Sjilles * called via 'command'. 990204800Sjilles */ 991204800Sjilles if (cmd_flags & DO_NOFUNC) 992204800Sjilles cmdentry.special = 0; 9931556Srgrimes } 9941556Srgrimes 9951556Srgrimes /* Fork off a child process if necessary. */ 996223282Sjilles if (((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) 997194127Sjilles && ((flags & EV_EXIT) == 0 || have_traps())) 99817987Speter || ((flags & EV_BACKCMD) != 0 999216826Sjilles && (cmdentry.cmdtype != CMDBUILTIN || 1000216826Sjilles !safe_builtin(cmdentry.u.index, argc, argv)))) { 10011556Srgrimes jp = makejob(cmd, 1); 1002223282Sjilles mode = FORK_FG; 10031556Srgrimes if (flags & EV_BACKCMD) { 10041556Srgrimes mode = FORK_NOJOB; 10051556Srgrimes if (pipe(pip) < 0) 100653891Scracauer error("Pipe call failed: %s", strerror(errno)); 10071556Srgrimes } 1008230998Sjilles if (cmdentry.cmdtype == CMDNORMAL && 1009230998Sjilles cmd->ncmd.redirect == NULL && 1010230998Sjilles varlist.list == NULL && 1011230998Sjilles (mode == FORK_FG || mode == FORK_NOJOB) && 1012230998Sjilles !disvforkset() && !iflag && !mflag) { 1013230998Sjilles vforkexecshell(jp, argv, environment(), path, 1014230998Sjilles cmdentry.u.index, flags & EV_BACKCMD ? pip : NULL); 1015230998Sjilles goto parent; 1016230998Sjilles } 10171556Srgrimes if (forkshell(jp, cmd, mode) != 0) 10181556Srgrimes goto parent; /* at end of routine */ 10191556Srgrimes if (flags & EV_BACKCMD) { 10201556Srgrimes FORCEINTON; 10211556Srgrimes close(pip[0]); 10221556Srgrimes if (pip[1] != 1) { 1023124780Sdes dup2(pip[1], 1); 10241556Srgrimes close(pip[1]); 10251556Srgrimes } 1026223163Sjilles flags &= ~EV_BACKCMD; 10271556Srgrimes } 10281556Srgrimes flags |= EV_EXIT; 10291556Srgrimes } 10301556Srgrimes 10311556Srgrimes /* This is the child process if a fork occurred. */ 10321556Srgrimes /* Execute the command. */ 10331556Srgrimes if (cmdentry.cmdtype == CMDFUNCTION) { 103420425Ssteve#ifdef DEBUG 10351556Srgrimes trputs("Shell function: "); trargs(argv); 103620425Ssteve#endif 10371556Srgrimes saveparam = shellparam; 10381556Srgrimes shellparam.malloc = 0; 103920425Ssteve shellparam.reset = 1; 10401556Srgrimes shellparam.nparam = argc - 1; 10411556Srgrimes shellparam.p = argv + 1; 10421556Srgrimes shellparam.optnext = NULL; 10431556Srgrimes INTOFF; 10441556Srgrimes savelocalvars = localvars; 10451556Srgrimes localvars = NULL; 1046196483Sjilles reffunc(cmdentry.u.func); 1047194765Sjilles savehandler = handler; 10481556Srgrimes if (setjmp(jmploc.loc)) { 1049218306Sjilles freeparam(&shellparam); 1050218306Sjilles shellparam = saveparam; 1051220978Sjilles popredir(); 1052196483Sjilles unreffunc(cmdentry.u.func); 10531556Srgrimes poplocalvars(); 10541556Srgrimes localvars = savelocalvars; 1055201283Sjilles funcnest--; 10561556Srgrimes handler = savehandler; 10571556Srgrimes longjmp(handler->loc, 1); 10581556Srgrimes } 10591556Srgrimes handler = &jmploc; 1060201283Sjilles funcnest++; 1061204802Sjilles redirect(cmd->ncmd.redirect, REDIR_PUSH); 1062199660Sjilles INTON; 10631556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 10641556Srgrimes mklocal(sp->text); 1065185231Sstefanf exitstatus = oexitstatus; 1066220978Sjilles evaltree(getfuncnode(cmdentry.u.func), 1067220978Sjilles flags & (EV_TESTED | EV_EXIT)); 10681556Srgrimes INTOFF; 1069196483Sjilles unreffunc(cmdentry.u.func); 10701556Srgrimes poplocalvars(); 10711556Srgrimes localvars = savelocalvars; 10721556Srgrimes freeparam(&shellparam); 10731556Srgrimes shellparam = saveparam; 10741556Srgrimes handler = savehandler; 1075201283Sjilles funcnest--; 10761556Srgrimes popredir(); 10771556Srgrimes INTON; 1078255215Sjilles if (evalskip == SKIPRETURN) { 10791556Srgrimes evalskip = 0; 10801556Srgrimes skipcount = 0; 10811556Srgrimes } 1082217035Sjilles if (jp) 10831556Srgrimes exitshell(exitstatus); 10841556Srgrimes } else if (cmdentry.cmdtype == CMDBUILTIN) { 108520425Ssteve#ifdef DEBUG 10861556Srgrimes trputs("builtin command: "); trargs(argv); 108720425Ssteve#endif 10881556Srgrimes mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; 10891556Srgrimes if (flags == EV_BACKCMD) { 10901556Srgrimes memout.nleft = 0; 10911556Srgrimes memout.nextc = memout.buf; 10921556Srgrimes memout.bufsize = 64; 10931556Srgrimes mode |= REDIR_BACKQ; 10941556Srgrimes } 10951556Srgrimes savecmdname = commandname; 1096199647Sjilles savetopfile = getcurrentfile(); 10971556Srgrimes cmdenviron = varlist.list; 10981556Srgrimes e = -1; 1099194765Sjilles savehandler = handler; 11001556Srgrimes if (setjmp(jmploc.loc)) { 11011556Srgrimes e = exception; 1102220978Sjilles if (e == EXINT) 1103220978Sjilles exitstatus = SIGINT+128; 1104220978Sjilles else if (e != EXEXIT) 1105220978Sjilles exitstatus = 2; 11061556Srgrimes goto cmddone; 11071556Srgrimes } 11081556Srgrimes handler = &jmploc; 1109157601Sstefanf redirect(cmd->ncmd.redirect, mode); 1110244162Sjilles outclearerror(out1); 1111205138Sjilles /* 1112205138Sjilles * If there is no command word, redirection errors should 1113205138Sjilles * not be fatal but assignment errors should. 1114205138Sjilles */ 1115228937Sjilles if (argc == 0) 1116205138Sjilles cmdentry.special = 1; 1117216870Sjilles listsetvar(cmdenviron, cmdentry.special ? 0 : VNOSET); 1118207678Sjilles if (argc > 0) 1119207678Sjilles bltinsetlocale(); 11201556Srgrimes commandname = argv[0]; 11211556Srgrimes argptr = argv + 1; 1122201053Sjilles nextopt_optptr = NULL; /* initialize nextopt */ 1123193169Sstefanf builtin_flags = flags; 11241556Srgrimes exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); 11251556Srgrimes flushall(); 1126244162Sjilles if (outiserror(out1)) { 1127244162Sjilles warning("write error on stdout"); 1128244162Sjilles if (exitstatus == 0 || exitstatus == 1) 1129244162Sjilles exitstatus = 2; 1130244162Sjilles } 11311556Srgrimescmddone: 1132207678Sjilles if (argc > 0) 1133207678Sjilles bltinunsetlocale(); 113460592Scracauer cmdenviron = NULL; 11351556Srgrimes out1 = &output; 11361556Srgrimes out2 = &errout; 11371556Srgrimes freestdout(); 1138217035Sjilles handler = savehandler; 1139218306Sjilles commandname = savecmdname; 1140218306Sjilles if (jp) 1141218306Sjilles exitshell(exitstatus); 1142201366Sjilles if (flags == EV_BACKCMD) { 1143201366Sjilles backcmd->buf = memout.buf; 1144201366Sjilles backcmd->nleft = memout.nextc - memout.buf; 1145201366Sjilles memout.buf = NULL; 1146201366Sjilles } 1147220978Sjilles if (cmdentry.u.index != EXECCMD) 1148204801Sjilles popredir(); 11491556Srgrimes if (e != -1) { 115020425Ssteve if ((e != EXERROR && e != EXEXEC) 1151157601Sstefanf || cmdentry.special) 11521556Srgrimes exraise(e); 1153199647Sjilles popfilesupto(savetopfile); 1154201366Sjilles if (flags != EV_BACKCMD) 1155201366Sjilles FORCEINTON; 11561556Srgrimes } 11571556Srgrimes } else { 115820425Ssteve#ifdef DEBUG 11591556Srgrimes trputs("normal command: "); trargs(argv); 116020425Ssteve#endif 11611556Srgrimes redirect(cmd->ncmd.redirect, 0); 11621556Srgrimes for (sp = varlist.list ; sp ; sp = sp->next) 11631556Srgrimes setvareq(sp->text, VEXPORT|VSTACK); 11641556Srgrimes envp = environment(); 1165204800Sjilles shellexec(argv, envp, path, cmdentry.u.index); 11661556Srgrimes /*NOTREACHED*/ 11671556Srgrimes } 11681556Srgrimes goto out; 11691556Srgrimes 11701556Srgrimesparent: /* parent process gets here (if we forked) */ 1171212214Sjilles if (mode == FORK_FG) { /* argument to fork */ 11721556Srgrimes INTOFF; 117345916Scracauer exitstatus = waitforjob(jp, &realstatus); 11741556Srgrimes INTON; 117545916Scracauer if (iflag && loopnest > 0 && WIFSIGNALED(realstatus)) { 117645266Scracauer evalskip = SKIPBREAK; 117745266Scracauer skipcount = loopnest; 117845266Scracauer } 1179212214Sjilles } else if (mode == FORK_NOJOB) { 11801556Srgrimes backcmd->fd = pip[0]; 11811556Srgrimes close(pip[1]); 11821556Srgrimes backcmd->jp = jp; 1183223282Sjilles } 11841556Srgrimes 11851556Srgrimesout: 11861556Srgrimes if (lastarg) 11871556Srgrimes setvar("_", lastarg, 0); 118854884Scracauer if (do_clearcmdentry) 1189218324Sjilles clearcmdentry(); 11901556Srgrimes} 11911556Srgrimes 11921556Srgrimes 11931556Srgrimes 11941556Srgrimes/* 11951556Srgrimes * Search for a command. This is called before we fork so that the 11961556Srgrimes * location of the command will be available in the parent as well as 11971556Srgrimes * the child. The check for "goodname" is an overly conservative 11981556Srgrimes * check that the name will not be subject to expansion. 11991556Srgrimes */ 12001556Srgrimes 1201213811Sobrienstatic void 120290111Simpprehash(union node *n) 120317987Speter{ 12041556Srgrimes struct cmdentry entry; 12051556Srgrimes 1206159633Sstefanf if (n && n->type == NCMD && n->ncmd.args) 120717987Speter if (goodname(n->ncmd.args->narg.text)) 120817987Speter find_command(n->ncmd.args->narg.text, &entry, 0, 120917987Speter pathval()); 12101556Srgrimes} 12111556Srgrimes 12121556Srgrimes 12131556Srgrimes 12141556Srgrimes/* 12151556Srgrimes * Builtin commands. Builtin commands whose functions are closely 12161556Srgrimes * tied to evaluation are implemented here. 12171556Srgrimes */ 12181556Srgrimes 12191556Srgrimes/* 1220201431Sjilles * No command given, a bltin command with no arguments, or a bltin command 1221201431Sjilles * with an invalid name. 12221556Srgrimes */ 12231556Srgrimes 122417987Speterint 1225201431Sjillesbltincmd(int argc, char **argv) 122617987Speter{ 1227201431Sjilles if (argc > 1) { 1228201431Sjilles out2fmt_flush("%s: not found\n", argv[1]); 1229201431Sjilles return 127; 1230201431Sjilles } 123120425Ssteve /* 123217987Speter * Preserve exitstatus of a previous possible redirection 123320425Ssteve * as POSIX mandates 123417987Speter */ 12351556Srgrimes return exitstatus; 12361556Srgrimes} 12371556Srgrimes 12381556Srgrimes 12391556Srgrimes/* 12401556Srgrimes * Handle break and continue commands. Break, continue, and return are 12411556Srgrimes * all handled by setting the evalskip flag. The evaluation routines 12421556Srgrimes * above all check this flag, and if it is set they start skipping 12431556Srgrimes * commands rather than executing them. The variable skipcount is 12441556Srgrimes * the number of loops to break/continue, or the number of function 12451556Srgrimes * levels to return. (The latter is always 1.) It should probably 12461556Srgrimes * be an error to break out of more loops than exist, but it isn't 12471556Srgrimes * in the standard shell so we don't make it one here. 12481556Srgrimes */ 12491556Srgrimes 125017987Speterint 125190111Simpbreakcmd(int argc, char **argv) 125217987Speter{ 125320425Ssteve int n = argc > 1 ? number(argv[1]) : 1; 12541556Srgrimes 12551556Srgrimes if (n > loopnest) 12561556Srgrimes n = loopnest; 12571556Srgrimes if (n > 0) { 12581556Srgrimes evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; 12591556Srgrimes skipcount = n; 12601556Srgrimes } 12611556Srgrimes return 0; 12621556Srgrimes} 12631556Srgrimes 1264100437Stjr/* 1265100437Stjr * The `command' command. 1266100437Stjr */ 1267100437Stjrint 1268240541Sjillescommandcmd(int argc __unused, char **argv __unused) 1269100437Stjr{ 1270207783Sjilles const char *path; 1271100437Stjr int ch; 1272151810Sstefanf int cmd = -1; 12731556Srgrimes 1274204800Sjilles path = bltinlookup("PATH", 1); 1275100437Stjr 1276240541Sjilles while ((ch = nextopt("pvV")) != '\0') { 1277100437Stjr switch (ch) { 1278100437Stjr case 'p': 1279207783Sjilles path = _PATH_STDPATH; 1280100437Stjr break; 1281151810Sstefanf case 'v': 1282151810Sstefanf cmd = TYPECMD_SMALLV; 1283151810Sstefanf break; 1284151810Sstefanf case 'V': 1285151810Sstefanf cmd = TYPECMD_BIGV; 1286151810Sstefanf break; 1287100437Stjr } 1288100437Stjr } 1289100437Stjr 1290151810Sstefanf if (cmd != -1) { 1291240541Sjilles if (*argptr == NULL || argptr[1] != NULL) 1292151810Sstefanf error("wrong number of arguments"); 1293240541Sjilles return typecmd_impl(2, argptr - 1, cmd, path); 1294151810Sstefanf } 1295240541Sjilles if (*argptr != NULL) 1296214538Sjilles error("commandcmd bad call"); 1297100437Stjr 1298100437Stjr /* 1299100437Stjr * Do nothing successfully if no command was specified; 1300100437Stjr * ksh also does this. 1301100437Stjr */ 1302204800Sjilles return 0; 1303100437Stjr} 1304100437Stjr 1305100437Stjr 13061556Srgrimes/* 13071556Srgrimes * The return command. 13081556Srgrimes */ 13091556Srgrimes 131017987Speterint 131190111Simpreturncmd(int argc, char **argv) 131217987Speter{ 131320425Ssteve int ret = argc > 1 ? number(argv[1]) : oexitstatus; 13141556Srgrimes 1315255215Sjilles evalskip = SKIPRETURN; 1316255215Sjilles skipcount = 1; 13171556Srgrimes return ret; 13181556Srgrimes} 13191556Srgrimes 13201556Srgrimes 132117987Speterint 132290111Simpfalsecmd(int argc __unused, char **argv __unused) 132317987Speter{ 132417987Speter return 1; 132517987Speter} 132617987Speter 132717987Speter 132817987Speterint 132990111Simptruecmd(int argc __unused, char **argv __unused) 133017987Speter{ 13311556Srgrimes return 0; 13321556Srgrimes} 13331556Srgrimes 13341556Srgrimes 133517987Speterint 133690111Simpexeccmd(int argc, char **argv) 133717987Speter{ 1338208630Sjilles /* 1339208630Sjilles * Because we have historically not supported any options, 1340208630Sjilles * only treat "--" specially. 1341208630Sjilles */ 1342208630Sjilles if (argc > 1 && strcmp(argv[1], "--") == 0) 1343208630Sjilles argc--, argv++; 13441556Srgrimes if (argc > 1) { 134517987Speter struct strlist *sp; 134617987Speter 13471556Srgrimes iflag = 0; /* exit on error */ 13481556Srgrimes mflag = 0; 13491556Srgrimes optschanged(); 135017987Speter for (sp = cmdenviron; sp ; sp = sp->next) 135117987Speter setvareq(sp->text, VEXPORT|VSTACK); 13521556Srgrimes shellexec(argv + 1, environment(), pathval(), 0); 13531556Srgrimes 13541556Srgrimes } 13551556Srgrimes return 0; 13561556Srgrimes} 1357153091Sstefanf 1358153091Sstefanf 1359153091Sstefanfint 1360153091Sstefanftimescmd(int argc __unused, char **argv __unused) 1361153091Sstefanf{ 1362153091Sstefanf struct rusage ru; 1363153091Sstefanf long shumins, shsmins, chumins, chsmins; 1364153091Sstefanf double shusecs, shssecs, chusecs, chssecs; 1365153091Sstefanf 1366153091Sstefanf if (getrusage(RUSAGE_SELF, &ru) < 0) 1367153091Sstefanf return 1; 1368153091Sstefanf shumins = ru.ru_utime.tv_sec / 60; 1369153091Sstefanf shusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1370153091Sstefanf shsmins = ru.ru_stime.tv_sec / 60; 1371153091Sstefanf shssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1372153091Sstefanf if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 1373153091Sstefanf return 1; 1374153091Sstefanf chumins = ru.ru_utime.tv_sec / 60; 1375153091Sstefanf chusecs = ru.ru_utime.tv_sec % 60 + ru.ru_utime.tv_usec / 1000000.; 1376153091Sstefanf chsmins = ru.ru_stime.tv_sec / 60; 1377153091Sstefanf chssecs = ru.ru_stime.tv_sec % 60 + ru.ru_stime.tv_usec / 1000000.; 1378153091Sstefanf out1fmt("%ldm%.3fs %ldm%.3fs\n%ldm%.3fs %ldm%.3fs\n", shumins, 1379153091Sstefanf shusecs, shsmins, shssecs, chumins, chusecs, chsmins, chssecs); 1380153091Sstefanf return 0; 1381153091Sstefanf} 1382