| /* Copyright (C) 1993,94,95,96,97,2002,2004 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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 (__pid_t pid); |
| extern int __waitid (__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 |
| __libc_waitpid (__pid_t pid, int *stat_loc, 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 (__libc_waitpid, __waitpid) |
| weak_alias (__libc_waitpid, waitpid) |
| libc_hidden_weak (__waitpid) |