1/* The <sys/wait.h> header contains macros related to wait(). The value 2 * returned by wait() and waitpid() depends on whether the process 3 * terminated by an exit() call, was killed by a signal, or was stopped 4 * due to job control, as follows: 5 * 6 * High byte Low byte 7 * +---------------------+ 8 * exit(status) | status | 0 | 9 * +---------------------+ 10 * killed by signal | 0 | signal | 11 * +---------------------+ 12 * stopped (job control) | signal | 0177 | 13 * +---------------------+ 14 */ 15 16#ifndef _WAIT_H 17#define _WAIT_H 18 19#ifndef _TYPES_H /* not quite right */ 20#include <sys/types.h> 21#endif 22 23#define __LOW(v) ((v) & 0377) 24#define __HIGH(v) (((v) >> 8) & 0377) 25 26#define WNOHANG 1 /* do not wait for child to exit */ 27#define WUNTRACED 2 /* for job control; not implemented */ 28 29#define WIFEXITED(s) (__LOW(s) == 0) /* normal exit */ 30#define WEXITSTATUS(s) (__HIGH(s)) /* exit status */ 31#define WTERMSIG(s) (__LOW(s) & 0177) /* sig value */ 32#define WIFSIGNALED(s) ((((unsigned int)(s)-1) & 0xFFFF) < 0xFF) /* signaled */ 33#define WIFSTOPPED(s) (__LOW(s) == 0177) /* stopped */ 34#define WSTOPSIG(s) (__HIGH(s) & 0377) /* stop signal */ 35 36/* Function Prototypes. */ 37#ifndef _ANSI_H 38#include <ansi.h> 39#endif 40 41_PROTOTYPE( pid_t wait, (int *_stat_loc) ); 42_PROTOTYPE( pid_t waitpid, (pid_t _pid, int *_stat_loc, int _options) ); 43 44#endif /* _WAIT_H */ 45