/* 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