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Brendan Kehoe 1993-12-18 06:38:01 +00:00
parent 32ce7e8a01
commit 39224cc9be
2 changed files with 99 additions and 0 deletions
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sysdeps/unix/sysv/sysv4/siginfo.h Normal file
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sysdeps/unix/sysv/sysv4/waitpid.c Normal file
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/* Copyright (C) 1993 Free Software Foundation, Inc.
Contributed by Brendan Kehoe (brendan@zen.org).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <stddef.h>
#include "siginfo.h"
typedef enum __idtype
{
/* Look for processes based upon a given PID. */
P_PID,
/* Look for processes based upon a given process-group ID. */
P_PGID = 2,
/* Look for any process. */
P_ALL = 7,
} __idtype_t;
extern __pid_t __getpgid __P ((__pid_t pid));
extern int __waitid __P ((__idtype_t idtype, __pid_t id,
__siginfo_t *infop, int options));
/* Wait for a child matching PID to die.
If PID is greater than 0, match any process whose process ID is PID.
If PID is (pid_t) -1, match any process.
If PID is (pid_t) 0, match any process with the
same process group as the current process.
If PID is less than -1, match any process whose
process group is the absolute value of PID.
If the WNOHANG bit is set in OPTIONS, and that child
is not already dead, return (pid_t) 0. If successful,
return PID and store the dead child's status in STAT_LOC.
Return (pid_t) -1 for errors. If the WUNTRACED bit is set in OPTIONS,
return status for stopped children; otherwise don't. */
__pid_t
DEFUN(__waitpid, (__pid, __stat_loc, __options),
__pid_t __pid AND int *__stat_loc AND int __options)
{
__idtype_t idtype;
__pid_t tmp_pid = __pid;
__siginfo_t infop;
if (__pid <= WAIT_MYPGRP)
{
if (__pid == WAIT_ANY)
{
/* Request the status for any child. */
idtype = P_ALL;
}
else if (__pid == WAIT_MYPGRP)
{
/* Request the status for any child process that has
a pgid that's equal to that of our parent. */
tmp_pid = __getpgid (0);
idtype = P_PGID;
}
else /* __pid < -1 */
{
/* Request the status for any child whose pgid is equal
to the absolute value of PID. */
tmp_pid = __pid & ~0; /* XXX not pseudo-insn */
idtype = P_PGID;
}
}
else
{
/* Request the status for the child whose pid is PID. */
idtype = P_PID;
}
if (__waitid (idtype, tmp_pid, &infop, __options | WEXITED | WTRAPPED) < 0)
{
*__stat_loc = infop.__status;
return -1;
}
*__stat_loc = infop.__status;
return __pid;
}