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121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/* Copyright (C) 1993,94,95,96,97,2002,2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Brendan Kehoe (brendan@zen.org).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <stddef.h>
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#include "siginfo.h"
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typedef enum __idtype
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{
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/* Look for processes based upon a given PID. */
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P_PID,
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/* Look for processes based upon a given process-group ID. */
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P_PGID = 2,
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/* Look for any process. */
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P_ALL = 7,
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} __idtype_t;
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extern __pid_t __getpgid (__pid_t pid);
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extern int __waitid (__idtype_t idtype, __pid_t id,
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__siginfo_t *infop, int options);
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/* Wait for a child matching PID to die.
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If PID is greater than 0, match any process whose process ID is PID.
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If PID is (pid_t) -1, match any process.
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If PID is (pid_t) 0, match any process with the
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same process group as the current process.
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If PID is less than -1, match any process whose
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process group is the absolute value of PID.
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If the WNOHANG bit is set in OPTIONS, and that child
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is not already dead, return (pid_t) 0. If successful,
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return PID and store the dead child's status in STAT_LOC.
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Return (pid_t) -1 for errors. If the WUNTRACED bit is set in OPTIONS,
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return status for stopped children; otherwise don't. */
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__pid_t
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__libc_waitpid (__pid_t pid, int *stat_loc, int options)
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{
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__idtype_t idtype;
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__pid_t tmp_pid = pid;
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__siginfo_t infop;
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if (pid <= WAIT_MYPGRP)
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{
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if (pid == WAIT_ANY)
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{
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/* Request the status for any child. */
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idtype = P_ALL;
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}
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else if (pid == WAIT_MYPGRP)
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{
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/* Request the status for any child process that has
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a pgid that's equal to that of our parent. */
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tmp_pid = __getpgid (0);
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idtype = P_PGID;
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}
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else /* PID < -1 */
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{
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/* Request the status for any child whose pgid is equal
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to the absolute value of PID. */
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tmp_pid = pid & ~0; /* XXX not pseudo-insn */
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idtype = P_PGID;
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}
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}
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else
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{
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/* Request the status for the child whose pid is PID. */
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idtype = P_PID;
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}
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if (__waitid (idtype, tmp_pid, &infop, options | WEXITED | WTRAPPED) < 0)
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return -1;
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switch (infop.__code)
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{
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case EXITED:
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*stat_loc = W_EXITCODE (infop.__status, 0);
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break;
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case STOPPED:
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case TRAPPED:
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*stat_loc = W_STOPCODE (infop.__status);
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break;
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case KILLED:
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/* Don't know what to do with continue, since it isn't documented.
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Putting it here seemed the right place though. */
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case CONTINUED:
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*stat_loc = infop.__status;
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/* FALLTHROUGH */
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case CORED:
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*stat_loc |= WCOREFLAG;
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break;
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}
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/* Return the PID out of the INFOP structure instead of the one we were
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called with, to account for cases of being called with -1 to signify
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any PID. */
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return infop.__pid;
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}
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weak_alias (__libc_waitpid, __waitpid)
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weak_alias (__libc_waitpid, waitpid)
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libc_hidden_weak (__waitpid)
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