1/* Utilities to execute a program in a subprocess (possibly linked by pipes 2 with other subprocesses), and wait for it. Generic Unix version 3 (also used for UWIN and VMS). 4 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2009, 5 2010, 2015 Free Software Foundation, Inc. 6 7This file is part of the libiberty library. 8Libiberty is free software; you can redistribute it and/or 9modify it under the terms of the GNU Library General Public 10License as published by the Free Software Foundation; either 11version 2 of the License, or (at your option) any later version. 12 13Libiberty is distributed in the hope that it will be useful, 14but WITHOUT ANY WARRANTY; without even the implied warranty of 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16Library General Public License for more details. 17 18You should have received a copy of the GNU Library General Public 19License along with libiberty; see the file COPYING.LIB. If not, 20write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 21Boston, MA 02110-1301, USA. */ 22 23#include "config.h" 24#include "libiberty.h" 25#include "pex-common.h" 26#include "environ.h" 27 28#include <stdio.h> 29#include <signal.h> 30#include <errno.h> 31#ifdef NEED_DECLARATION_ERRNO 32extern int errno; 33#endif 34#ifdef HAVE_STDLIB_H 35#include <stdlib.h> 36#endif 37#ifdef HAVE_STRING_H 38#include <string.h> 39#endif 40#ifdef HAVE_UNISTD_H 41#include <unistd.h> 42#endif 43 44#include <sys/types.h> 45 46#ifdef HAVE_FCNTL_H 47#include <fcntl.h> 48#endif 49#ifdef HAVE_SYS_WAIT_H 50#include <sys/wait.h> 51#endif 52#ifdef HAVE_GETRUSAGE 53#include <sys/time.h> 54#include <sys/resource.h> 55#endif 56#ifdef HAVE_SYS_STAT_H 57#include <sys/stat.h> 58#endif 59#ifdef HAVE_PROCESS_H 60#include <process.h> 61#endif 62 63#ifdef vfork /* Autoconf may define this to fork for us. */ 64# define VFORK_STRING "fork" 65#else 66# define VFORK_STRING "vfork" 67#endif 68#ifdef HAVE_VFORK_H 69#include <vfork.h> 70#endif 71#if defined(VMS) && defined (__LONG_POINTERS) 72#ifndef __CHAR_PTR32 73typedef char * __char_ptr32 74__attribute__ ((mode (SI))); 75#endif 76 77typedef __char_ptr32 *__char_ptr_char_ptr32 78__attribute__ ((mode (SI))); 79 80/* Return a 32 bit pointer to an array of 32 bit pointers 81 given a 64 bit pointer to an array of 64 bit pointers. */ 82 83static __char_ptr_char_ptr32 84to_ptr32 (char **ptr64) 85{ 86 int argc; 87 __char_ptr_char_ptr32 short_argv; 88 89 /* Count number of arguments. */ 90 for (argc = 0; ptr64[argc] != NULL; argc++) 91 ; 92 93 /* Reallocate argv with 32 bit pointers. */ 94 short_argv = (__char_ptr_char_ptr32) decc$malloc 95 (sizeof (__char_ptr32) * (argc + 1)); 96 97 for (argc = 0; ptr64[argc] != NULL; argc++) 98 short_argv[argc] = (__char_ptr32) decc$strdup (ptr64[argc]); 99 100 short_argv[argc] = (__char_ptr32) 0; 101 return short_argv; 102 103} 104#else 105#define to_ptr32(argv) argv 106#endif 107 108/* File mode to use for private and world-readable files. */ 109 110#if defined (S_IRUSR) && defined (S_IWUSR) && defined (S_IRGRP) && defined (S_IWGRP) && defined (S_IROTH) && defined (S_IWOTH) 111#define PUBLIC_MODE \ 112 (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH) 113#else 114#define PUBLIC_MODE 0666 115#endif 116 117/* Get the exit status of a particular process, and optionally get the 118 time that it took. This is simple if we have wait4, slightly 119 harder if we have waitpid, and is a pain if we only have wait. */ 120 121static pid_t pex_wait (struct pex_obj *, pid_t, int *, struct pex_time *); 122 123#ifdef HAVE_WAIT4 124 125static pid_t 126pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status, 127 struct pex_time *time) 128{ 129 pid_t ret; 130 struct rusage r; 131 132#ifdef HAVE_WAITPID 133 if (time == NULL) 134 return waitpid (pid, status, 0); 135#endif 136 137 ret = wait4 (pid, status, 0, &r); 138 139 if (time != NULL) 140 { 141 time->user_seconds = r.ru_utime.tv_sec; 142 time->user_microseconds= r.ru_utime.tv_usec; 143 time->system_seconds = r.ru_stime.tv_sec; 144 time->system_microseconds= r.ru_stime.tv_usec; 145 } 146 147 return ret; 148} 149 150#else /* ! defined (HAVE_WAIT4) */ 151 152#ifdef HAVE_WAITPID 153 154#ifndef HAVE_GETRUSAGE 155 156static pid_t 157pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status, 158 struct pex_time *time) 159{ 160 if (time != NULL) 161 memset (time, 0, sizeof (struct pex_time)); 162 return waitpid (pid, status, 0); 163} 164 165#else /* defined (HAVE_GETRUSAGE) */ 166 167static pid_t 168pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status, 169 struct pex_time *time) 170{ 171 struct rusage r1, r2; 172 pid_t ret; 173 174 if (time == NULL) 175 return waitpid (pid, status, 0); 176 177 getrusage (RUSAGE_CHILDREN, &r1); 178 179 ret = waitpid (pid, status, 0); 180 if (ret < 0) 181 return ret; 182 183 getrusage (RUSAGE_CHILDREN, &r2); 184 185 time->user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec; 186 time->user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec; 187 if (r2.ru_utime.tv_usec < r1.ru_utime.tv_usec) 188 { 189 --time->user_seconds; 190 time->user_microseconds += 1000000; 191 } 192 193 time->system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec; 194 time->system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec; 195 if (r2.ru_stime.tv_usec < r1.ru_stime.tv_usec) 196 { 197 --time->system_seconds; 198 time->system_microseconds += 1000000; 199 } 200 201 return ret; 202} 203 204#endif /* defined (HAVE_GETRUSAGE) */ 205 206#else /* ! defined (HAVE_WAITPID) */ 207 208struct status_list 209{ 210 struct status_list *next; 211 pid_t pid; 212 int status; 213 struct pex_time time; 214}; 215 216static pid_t 217pex_wait (struct pex_obj *obj, pid_t pid, int *status, struct pex_time *time) 218{ 219 struct status_list **pp; 220 221 for (pp = (struct status_list **) &obj->sysdep; 222 *pp != NULL; 223 pp = &(*pp)->next) 224 { 225 if ((*pp)->pid == pid) 226 { 227 struct status_list *p; 228 229 p = *pp; 230 *status = p->status; 231 if (time != NULL) 232 *time = p->time; 233 *pp = p->next; 234 free (p); 235 return pid; 236 } 237 } 238 239 while (1) 240 { 241 pid_t cpid; 242 struct status_list *psl; 243 struct pex_time pt; 244#ifdef HAVE_GETRUSAGE 245 struct rusage r1, r2; 246#endif 247 248 if (time != NULL) 249 { 250#ifdef HAVE_GETRUSAGE 251 getrusage (RUSAGE_CHILDREN, &r1); 252#else 253 memset (&pt, 0, sizeof (struct pex_time)); 254#endif 255 } 256 257 cpid = wait (status); 258 259#ifdef HAVE_GETRUSAGE 260 if (time != NULL && cpid >= 0) 261 { 262 getrusage (RUSAGE_CHILDREN, &r2); 263 264 pt.user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec; 265 pt.user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec; 266 if (pt.user_microseconds < 0) 267 { 268 --pt.user_seconds; 269 pt.user_microseconds += 1000000; 270 } 271 272 pt.system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec; 273 pt.system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec; 274 if (pt.system_microseconds < 0) 275 { 276 --pt.system_seconds; 277 pt.system_microseconds += 1000000; 278 } 279 } 280#endif 281 282 if (cpid < 0 || cpid == pid) 283 { 284 if (time != NULL) 285 *time = pt; 286 return cpid; 287 } 288 289 psl = XNEW (struct status_list); 290 psl->pid = cpid; 291 psl->status = *status; 292 if (time != NULL) 293 psl->time = pt; 294 psl->next = (struct status_list *) obj->sysdep; 295 obj->sysdep = (void *) psl; 296 } 297} 298 299#endif /* ! defined (HAVE_WAITPID) */ 300#endif /* ! defined (HAVE_WAIT4) */ 301 302static void pex_child_error (struct pex_obj *, const char *, const char *, int) 303 ATTRIBUTE_NORETURN; 304static int pex_unix_open_read (struct pex_obj *, const char *, int); 305static int pex_unix_open_write (struct pex_obj *, const char *, int, int); 306static pid_t pex_unix_exec_child (struct pex_obj *, int, const char *, 307 char * const *, char * const *, 308 int, int, int, int, 309 const char **, int *); 310static int pex_unix_close (struct pex_obj *, int); 311static int pex_unix_wait (struct pex_obj *, pid_t, int *, struct pex_time *, 312 int, const char **, int *); 313static int pex_unix_pipe (struct pex_obj *, int *, int); 314static FILE *pex_unix_fdopenr (struct pex_obj *, int, int); 315static FILE *pex_unix_fdopenw (struct pex_obj *, int, int); 316static void pex_unix_cleanup (struct pex_obj *); 317 318/* The list of functions we pass to the common routines. */ 319 320const struct pex_funcs funcs = 321{ 322 pex_unix_open_read, 323 pex_unix_open_write, 324 pex_unix_exec_child, 325 pex_unix_close, 326 pex_unix_wait, 327 pex_unix_pipe, 328 pex_unix_fdopenr, 329 pex_unix_fdopenw, 330 pex_unix_cleanup 331}; 332 333/* Return a newly initialized pex_obj structure. */ 334 335struct pex_obj * 336pex_init (int flags, const char *pname, const char *tempbase) 337{ 338 return pex_init_common (flags, pname, tempbase, &funcs); 339} 340 341/* Open a file for reading. */ 342 343static int 344pex_unix_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name, 345 int binary ATTRIBUTE_UNUSED) 346{ 347 return open (name, O_RDONLY); 348} 349 350/* Open a file for writing. */ 351 352static int 353pex_unix_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name, 354 int binary ATTRIBUTE_UNUSED, int append) 355{ 356 /* Note that we can't use O_EXCL here because gcc may have already 357 created the temporary file via make_temp_file. */ 358 return open (name, O_WRONLY | O_CREAT 359 | (append ? O_APPEND : O_TRUNC), PUBLIC_MODE); 360} 361 362/* Close a file. */ 363 364static int 365pex_unix_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) 366{ 367 return close (fd); 368} 369 370/* Report an error from a child process. We don't use stdio routines, 371 because we might be here due to a vfork call. */ 372 373static void 374pex_child_error (struct pex_obj *obj, const char *executable, 375 const char *errmsg, int err) 376{ 377 int retval = 0; 378#define writeerr(s) retval |= (write (STDERR_FILE_NO, s, strlen (s)) < 0) 379 writeerr (obj->pname); 380 writeerr (": error trying to exec '"); 381 writeerr (executable); 382 writeerr ("': "); 383 writeerr (errmsg); 384 writeerr (": "); 385 writeerr (xstrerror (err)); 386 writeerr ("\n"); 387#undef writeerr 388 /* Exit with -2 if the error output failed, too. */ 389 _exit (retval == 0 ? -1 : -2); 390} 391 392/* Execute a child. */ 393 394#if defined(HAVE_SPAWNVE) && defined(HAVE_SPAWNVPE) 395/* Implementation of pex->exec_child using the Cygwin spawn operation. */ 396 397/* Subroutine of pex_unix_exec_child. Move OLD_FD to a new file descriptor 398 to be stored in *PNEW_FD, save the flags in *PFLAGS, and arrange for the 399 saved copy to be close-on-exec. Move CHILD_FD into OLD_FD. If CHILD_FD 400 is -1, OLD_FD is to be closed. Return -1 on error. */ 401 402static int 403save_and_install_fd(int *pnew_fd, int *pflags, int old_fd, int child_fd) 404{ 405 int new_fd, flags; 406 407 flags = fcntl (old_fd, F_GETFD); 408 409 /* If we could not retrieve the flags, then OLD_FD was not open. */ 410 if (flags < 0) 411 { 412 new_fd = -1, flags = 0; 413 if (child_fd >= 0 && dup2 (child_fd, old_fd) < 0) 414 return -1; 415 } 416 /* If we wish to close OLD_FD, just mark it CLOEXEC. */ 417 else if (child_fd == -1) 418 { 419 new_fd = old_fd; 420 if ((flags & FD_CLOEXEC) == 0 && fcntl (old_fd, F_SETFD, FD_CLOEXEC) < 0) 421 return -1; 422 } 423 /* Otherwise we need to save a copy of OLD_FD before installing CHILD_FD. */ 424 else 425 { 426#ifdef F_DUPFD_CLOEXEC 427 new_fd = fcntl (old_fd, F_DUPFD_CLOEXEC, 3); 428 if (new_fd < 0) 429 return -1; 430#else 431 /* Prefer F_DUPFD over dup in order to avoid getting a new fd 432 in the range 0-2, right where a new stderr fd might get put. */ 433 new_fd = fcntl (old_fd, F_DUPFD, 3); 434 if (new_fd < 0) 435 return -1; 436 if (fcntl (new_fd, F_SETFD, FD_CLOEXEC) < 0) 437 return -1; 438#endif 439 if (dup2 (child_fd, old_fd) < 0) 440 return -1; 441 } 442 443 *pflags = flags; 444 if (pnew_fd) 445 *pnew_fd = new_fd; 446 else if (new_fd != old_fd) 447 abort (); 448 449 return 0; 450} 451 452/* Subroutine of pex_unix_exec_child. Move SAVE_FD back to OLD_FD 453 restoring FLAGS. If SAVE_FD < 0, OLD_FD is to be closed. */ 454 455static int 456restore_fd(int old_fd, int save_fd, int flags) 457{ 458 /* For SAVE_FD < 0, all we have to do is restore the 459 "closed-ness" of the original. */ 460 if (save_fd < 0) 461 return close (old_fd); 462 463 /* For SAVE_FD == OLD_FD, all we have to do is restore the 464 original setting of the CLOEXEC flag. */ 465 if (save_fd == old_fd) 466 { 467 if (flags & FD_CLOEXEC) 468 return 0; 469 return fcntl (old_fd, F_SETFD, flags); 470 } 471 472 /* Otherwise we have to move the descriptor back, restore the flags, 473 and close the saved copy. */ 474#ifdef HAVE_DUP3 475 if (flags == FD_CLOEXEC) 476 { 477 if (dup3 (save_fd, old_fd, O_CLOEXEC) < 0) 478 return -1; 479 } 480 else 481#endif 482 { 483 if (dup2 (save_fd, old_fd) < 0) 484 return -1; 485 if (flags != 0 && fcntl (old_fd, F_SETFD, flags) < 0) 486 return -1; 487 } 488 return close (save_fd); 489} 490 491static pid_t 492pex_unix_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED, 493 int flags, const char *executable, 494 char * const * argv, char * const * env, 495 int in, int out, int errdes, int toclose, 496 const char **errmsg, int *err) 497{ 498 int fl_in = 0, fl_out = 0, fl_err = 0, fl_tc = 0; 499 int save_in = -1, save_out = -1, save_err = -1; 500 int max, retries; 501 pid_t pid; 502 503 if (flags & PEX_STDERR_TO_STDOUT) 504 errdes = out; 505 506 /* We need the three standard file descriptors to be set up as for 507 the child before we perform the spawn. The file descriptors for 508 the parent need to be moved and marked for close-on-exec. */ 509 if (in != STDIN_FILE_NO 510 && save_and_install_fd (&save_in, &fl_in, STDIN_FILE_NO, in) < 0) 511 goto error_dup2; 512 if (out != STDOUT_FILE_NO 513 && save_and_install_fd (&save_out, &fl_out, STDOUT_FILE_NO, out) < 0) 514 goto error_dup2; 515 if (errdes != STDERR_FILE_NO 516 && save_and_install_fd (&save_err, &fl_err, STDERR_FILE_NO, errdes) < 0) 517 goto error_dup2; 518 if (toclose >= 0 519 && save_and_install_fd (NULL, &fl_tc, toclose, -1) < 0) 520 goto error_dup2; 521 522 /* Now that we've moved the file descriptors for the child into place, 523 close the originals. Be careful not to close any of the standard 524 file descriptors that we just set up. */ 525 max = -1; 526 if (errdes >= 0) 527 max = STDERR_FILE_NO; 528 else if (out >= 0) 529 max = STDOUT_FILE_NO; 530 else if (in >= 0) 531 max = STDIN_FILE_NO; 532 if (in > max) 533 close (in); 534 if (out > max) 535 close (out); 536 if (errdes > max && errdes != out) 537 close (errdes); 538 539 /* If we were not given an environment, use the global environment. */ 540 if (env == NULL) 541 env = environ; 542 543 /* Launch the program. If we get EAGAIN (normally out of pid's), try 544 again a few times with increasing backoff times. */ 545 retries = 0; 546 while (1) 547 { 548 typedef const char * const *cc_cp; 549 550 if (flags & PEX_SEARCH) 551 pid = spawnvpe (_P_NOWAITO, executable, (cc_cp)argv, (cc_cp)env); 552 else 553 pid = spawnve (_P_NOWAITO, executable, (cc_cp)argv, (cc_cp)env); 554 555 if (pid > 0) 556 break; 557 558 *err = errno; 559 *errmsg = "spawn"; 560 if (errno != EAGAIN || ++retries == 4) 561 return (pid_t) -1; 562 sleep (1 << retries); 563 } 564 565 /* Success. Restore the parent's file descriptors that we saved above. */ 566 if (toclose >= 0 567 && restore_fd (toclose, toclose, fl_tc) < 0) 568 goto error_dup2; 569 if (in != STDIN_FILE_NO 570 && restore_fd (STDIN_FILE_NO, save_in, fl_in) < 0) 571 goto error_dup2; 572 if (out != STDOUT_FILE_NO 573 && restore_fd (STDOUT_FILE_NO, save_out, fl_out) < 0) 574 goto error_dup2; 575 if (errdes != STDERR_FILE_NO 576 && restore_fd (STDERR_FILE_NO, save_err, fl_err) < 0) 577 goto error_dup2; 578 579 return pid; 580 581 error_dup2: 582 *err = errno; 583 *errmsg = "dup2"; 584 return (pid_t) -1; 585} 586 587#else 588/* Implementation of pex->exec_child using standard vfork + exec. */ 589 590static pid_t 591pex_unix_exec_child (struct pex_obj *obj, int flags, const char *executable, 592 char * const * argv, char * const * env, 593 int in, int out, int errdes, 594 int toclose, const char **errmsg, int *err) 595{ 596 pid_t pid; 597 598 /* We declare these to be volatile to avoid warnings from gcc about 599 them being clobbered by vfork. */ 600 volatile int sleep_interval; 601 volatile int retries; 602 603 /* We vfork and then set environ in the child before calling execvp. 604 This clobbers the parent's environ so we need to restore it. 605 It would be nice to use one of the exec* functions that takes an 606 environment as a parameter, but that may have portability issues. */ 607 char **save_environ = environ; 608 609 sleep_interval = 1; 610 pid = -1; 611 for (retries = 0; retries < 4; ++retries) 612 { 613 pid = vfork (); 614 if (pid >= 0) 615 break; 616 sleep (sleep_interval); 617 sleep_interval *= 2; 618 } 619 620 switch (pid) 621 { 622 case -1: 623 *err = errno; 624 *errmsg = VFORK_STRING; 625 return (pid_t) -1; 626 627 case 0: 628 /* Child process. */ 629 if (in != STDIN_FILE_NO) 630 { 631 if (dup2 (in, STDIN_FILE_NO) < 0) 632 pex_child_error (obj, executable, "dup2", errno); 633 if (close (in) < 0) 634 pex_child_error (obj, executable, "close", errno); 635 } 636 if (out != STDOUT_FILE_NO) 637 { 638 if (dup2 (out, STDOUT_FILE_NO) < 0) 639 pex_child_error (obj, executable, "dup2", errno); 640 if (close (out) < 0) 641 pex_child_error (obj, executable, "close", errno); 642 } 643 if (errdes != STDERR_FILE_NO) 644 { 645 if (dup2 (errdes, STDERR_FILE_NO) < 0) 646 pex_child_error (obj, executable, "dup2", errno); 647 if (close (errdes) < 0) 648 pex_child_error (obj, executable, "close", errno); 649 } 650 if (toclose >= 0) 651 { 652 if (close (toclose) < 0) 653 pex_child_error (obj, executable, "close", errno); 654 } 655 if ((flags & PEX_STDERR_TO_STDOUT) != 0) 656 { 657 if (dup2 (STDOUT_FILE_NO, STDERR_FILE_NO) < 0) 658 pex_child_error (obj, executable, "dup2", errno); 659 } 660 661 if (env) 662 { 663 /* NOTE: In a standard vfork implementation this clobbers the 664 parent's copy of environ "too" (in reality there's only one copy). 665 This is ok as we restore it below. */ 666 environ = (char**) env; 667 } 668 669 if ((flags & PEX_SEARCH) != 0) 670 { 671 execvp (executable, to_ptr32 (argv)); 672 pex_child_error (obj, executable, "execvp", errno); 673 } 674 else 675 { 676 execv (executable, to_ptr32 (argv)); 677 pex_child_error (obj, executable, "execv", errno); 678 } 679 680 /* NOTREACHED */ 681 return (pid_t) -1; 682 683 default: 684 /* Parent process. */ 685 686 /* Restore environ. 687 Note that the parent either doesn't run until the child execs/exits 688 (standard vfork behaviour), or if it does run then vfork is behaving 689 more like fork. In either case we needn't worry about clobbering 690 the child's copy of environ. */ 691 environ = save_environ; 692 693 if (in != STDIN_FILE_NO) 694 { 695 if (close (in) < 0) 696 { 697 *err = errno; 698 *errmsg = "close"; 699 return (pid_t) -1; 700 } 701 } 702 if (out != STDOUT_FILE_NO) 703 { 704 if (close (out) < 0) 705 { 706 *err = errno; 707 *errmsg = "close"; 708 return (pid_t) -1; 709 } 710 } 711 if (errdes != STDERR_FILE_NO) 712 { 713 if (close (errdes) < 0) 714 { 715 *err = errno; 716 *errmsg = "close"; 717 return (pid_t) -1; 718 } 719 } 720 721 return pid; 722 } 723} 724#endif /* SPAWN */ 725 726/* Wait for a child process to complete. */ 727 728static int 729pex_unix_wait (struct pex_obj *obj, pid_t pid, int *status, 730 struct pex_time *time, int done, const char **errmsg, 731 int *err) 732{ 733 /* If we are cleaning up when the caller didn't retrieve process 734 status for some reason, encourage the process to go away. */ 735 if (done) 736 kill (pid, SIGTERM); 737 738 if (pex_wait (obj, pid, status, time) < 0) 739 { 740 *err = errno; 741 *errmsg = "wait"; 742 return -1; 743 } 744 745 return 0; 746} 747 748/* Create a pipe. */ 749 750static int 751pex_unix_pipe (struct pex_obj *obj ATTRIBUTE_UNUSED, int *p, 752 int binary ATTRIBUTE_UNUSED) 753{ 754 return pipe (p); 755} 756 757/* Get a FILE pointer to read from a file descriptor. */ 758 759static FILE * 760pex_unix_fdopenr (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd, 761 int binary ATTRIBUTE_UNUSED) 762{ 763 return fdopen (fd, "r"); 764} 765 766static FILE * 767pex_unix_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd, 768 int binary ATTRIBUTE_UNUSED) 769{ 770 if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0) 771 return NULL; 772 return fdopen (fd, "w"); 773} 774 775static void 776pex_unix_cleanup (struct pex_obj *obj ATTRIBUTE_UNUSED) 777{ 778#if !defined (HAVE_WAIT4) && !defined (HAVE_WAITPID) 779 while (obj->sysdep != NULL) 780 { 781 struct status_list *this; 782 struct status_list *next; 783 784 this = (struct status_list *) obj->sysdep; 785 next = this->next; 786 free (this); 787 obj->sysdep = (void *) next; 788 } 789#endif 790} 791