da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/***********************************************************************
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* This software is part of the ast package *
3e14f97f673e8a630f076077de35afdd43dc1587Roger A. Faulkner* Copyright (c) 1985-2010 AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* and is licensed under the *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Common Public License, Version 1.0 *
7c2fbfb345896881c631598ee3852ce9ce33fb07April Chin* by AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* A copy of the License is available at *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* http://www.opensource.org/licenses/cpl1.0.txt *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Information and Software Systems Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* AT&T Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Florham Park NJ *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Glenn Fowler <gsf@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* David Korn <dgk@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Phong Vo <kpv@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin***********************************************************************/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#pragma prototyped
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * POSIX waitpid()
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * pid < -1 WUNTRACED may not be fully supported
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * process group specifics ignored by non-{waitpid,wait4}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <ast.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <wait.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_waitpid
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinNoN(waitpid)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_wait4
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinstruct rusage;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinextern int wait4(int, int*, int, struct rusage*);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinpid_t
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinwaitpid(pid_t pid, int* status, int flags)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(wait4(pid, status, flags, NiL));
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#undef SIGCLD
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_wait3
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinextern int wait3(int*, int, struct rusage*);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_wait2
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#define wait3(s,f,u) wait2(s,f)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinextern int wait2(int*, int);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <sig.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#define wait3(s,f,u) wait(s)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinstatic int caught;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinstatic void
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chincatch(sig)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinint sig;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin NoP(sig);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin caught = 1;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <error.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinstruct zombie
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct zombie* next;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int status;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin pid_t pid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin};
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinpid_t
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinwaitpid(pid_t pid, int* status, int flags)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register struct zombie* zp;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register struct zombie* pp;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register int p;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int s;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if !_lib_wait2 && !_lib_wait3
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if !defined(SIGCLD)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int n;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int oerrno;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin Sig_handler_t handler;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static struct zombie* zombies;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin pp = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp = zombies;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (zp)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (zp->pid >= 0 && (zp->pid == pid || pid <= 0))
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (pp) pp->next = zp->next;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else zombies = zp->next;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (status) *status = zp->status;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin pid = zp->pid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin free(zp);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(pid);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (pid > 0 && kill(pid, 0) < 0) return(-1);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (;;)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if !_lib_wait2 && !_lib_wait3
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if !defined(SIGCLD)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin oerrno = errno;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & WNOHANG)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin caught = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if defined(SIGCLD)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin handler = signal(SIGCLD, catch);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!caught)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin signal(SIGCLD, handler);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(0);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if defined(SIGALRM)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin handler = signal(SIGALRM, catch);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin n = alarm(1);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin p = wait3(&s, flags, NiL);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if !_lib_wait3
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if !_lib_wait2
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if defined(SIGCLD)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & WNOHANG) signal(SIGCLD, handler);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if defined(SIGALRM)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & WNOHANG)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (n == 0 && !caught || n == 1) alarm(n);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else if (n > 1) alarm(n - caught);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin signal(SIGALRM, handler);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (p == -1 && errno == EINTR)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin errno = oerrno;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin p = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin s = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (p == -1 && errno == EINVAL && (flags & ~WNOHANG))
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin p = wait3(&s, flags & WNOHANG, NiL);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (p <= 0)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (p == 0 && status) *status = s;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(p);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (pid <= 0 || p == pid)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (status) *status = s;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(p);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!(zp = newof(0, struct zombie, 1, 0))) return(-1);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->pid = p;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->status = s;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->next = zombies;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zombies = zp;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /*NOTREACHED*/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif