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* sysdeps/unix/sysv/linux/bits/waitflags.h
(WSTOPPED, WEXITED, WCONTINUED, WNOWAIT): New macros. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_WAITID_SYSCALL): New macro. * sysdeps/unix/sysv/linux/waitid.c: New file. Use new syscall when available, or fall back to the waitpid-based generic code.
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Roland McGrath
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Sep 1, 2004
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/* Linux implementation of waitid. | ||
Copyright (C) 2004 Free Software Foundation, Inc. | ||
This file is part of the GNU C Library. | ||
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. */ | ||
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#include <errno.h> | ||
#include <sys/wait.h> | ||
#include <kernel-features.h> | ||
#include <sysdep.h> | ||
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#ifdef __NR_waitid | ||
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# if __ASSUME_WAITID_SYSCALL > 0 | ||
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static inline int | ||
do_waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options) | ||
{ | ||
return INLINE_SYSCALL (waitid, 4, idtype, id, infop, options); | ||
} | ||
# define NO_DO_WAITID | ||
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# else | ||
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static int do_compat_waitid (idtype_t idtype, id_t id, | ||
siginfo_t *infop, int options); | ||
# define DO_WAITID do_compat_waitid | ||
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static int | ||
do_waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options) | ||
{ | ||
static int waitid_works; | ||
if (waitid_works > 0) | ||
return INLINE_SYSCALL (waitid, 4, idtype, id, infop, options); | ||
if (waitid_works == 0) | ||
{ | ||
int result = INLINE_SYSCALL (waitid, 4, idtype, id, infop, options); | ||
if (result < 0 && errno == ENOSYS) | ||
waitid_works = -1; | ||
else | ||
{ | ||
waitid_works = 1; | ||
return result; | ||
} | ||
} | ||
return do_compat_waitid (idtype, id, infop, options); | ||
} | ||
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# endif | ||
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#endif | ||
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#include "sysdeps/posix/waitid.c" |