diff options
Diffstat (limited to 'sysdeps/unix/sysv/sysv4/waitpid.c')
| -rw-r--r-- | sysdeps/unix/sysv/sysv4/waitpid.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/sysv4/waitpid.c b/sysdeps/unix/sysv/sysv4/waitpid.c new file mode 100644 index 0000000000..f54df4bf6b --- /dev/null +++ b/sysdeps/unix/sysv/sysv4/waitpid.c @@ -0,0 +1,120 @@ +/* Copyright (C) 1993, 1994, 1995 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) + return -1; + + switch (infop.__code) + { + case EXITED: + *stat_loc = W_EXITCODE (infop.__status, 0); + break; + case STOPPED: + case TRAPPED: + *stat_loc = W_STOPCODE (infop.__status); + break; + case KILLED: + /* Don't know what to do with continue, since it isn't documented. + Putting it here seemed the right place though. */ + case CONTINUED: + *stat_loc = infop.__status; + /* FALLTHROUGH */ + case CORED: + *stat_loc |= WCOREFLAG; + break; + } + + /* Return the PID out of the INFOP structure instead of the one we were + called with, to account for cases of being called with -1 to signify + any PID. */ + return infop.__pid; +} + +weak_alias (__waitpid, waitpid) |