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/* vi: set sw=4 ts=4: */
/*
* Copyright (C) 2007 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <features.h>
#if defined __USE_SVID || defined __USE_XOPEN
# include <string.h>
# include <sys/types.h>
# include <sys/wait.h>
# include <sys/syscall.h>
# ifdef __NR_waitid
# ifdef __UCLIBC_HAS_THREADS_NATIVE__
# include <sysdep-cancel.h>
# else
# define SINGLE_THREAD_P 1
# endif
/* The waitid() POSIX interface takes 4 arguments, but the kernel function
* actually takes 5. The fifth is a pointer to struct rusage. Make sure
* we pass NULL rather than letting whatever was in the register bleed up.
*/
#define __NR_waitid5 __NR_waitid
static __always_inline
_syscall5(int, waitid5, idtype_t, idtype, id_t, id, siginfo_t*, infop,
int, options, struct rusage*, ru)
# endif
int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
# ifdef __NR_waitid
if (SINGLE_THREAD_P)
return waitid5(idtype, id, infop, options, NULL);
# ifdef __UCLIBC_HAS_THREADS_NATIVE__
int oldtype = LIBC_CANCEL_ASYNC ();
int result = waitid5(idtype, id, infop, options, NULL);
LIBC_CANCEL_RESET (oldtype);
return result;
# endif
# elif defined __NR_waitpid
switch (idtype) {
case P_PID:
if (id <= 0)
goto invalid;
break;
case P_PGID:
if (id < 0 || id == 1)
goto invalid;
id = -id;
break;
case P_ALL:
id = -1;
break;
default:
invalid:
__set_errno(EINVAL);
return -1;
}
memset(infop, 0, sizeof *infop);
infop->si_pid = waitpid(id, &infop->si_status, options
# ifdef WEXITED
&~ WEXITED
# endif
);
if (infop->si_pid < 0)
return infop->si_pid;
return 0;
# else
__set_errno(ENOSYS);
return -1;
# endif
}
#endif
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