diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/getpid.c')
-rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/getpid.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/getpid.c b/libpthread/nptl/sysdeps/unix/sysv/linux/getpid.c new file mode 100644 index 000000000..9a4f51c9d --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/getpid.c @@ -0,0 +1,63 @@ +/* Copyright (C) 2003, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. + + 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 <unistd.h> +#include <tls.h> +#include <sysdep.h> + + +extern __typeof(getpid) __getpid; +#ifndef NOT_IN_libc +static __always_inline pid_t really_getpid (pid_t oldval); + +static __always_inline pid_t really_getpid (pid_t oldval) +{ + if (__builtin_expect (oldval == 0, 1)) + { + pid_t selftid = THREAD_GETMEM (THREAD_SELF, tid); + if (__builtin_expect (selftid != 0, 1)) + return selftid; + } + + INTERNAL_SYSCALL_DECL (err); + pid_t result = INTERNAL_SYSCALL (getpid, err, 0); + + /* We do not set the PID field in the TID here since we might be + called from a signal handler while the thread executes fork. */ + if (oldval == 0) + THREAD_SETMEM (THREAD_SELF, tid, result); + return result; +} +#endif + +pid_t __getpid (void) +{ +#ifdef NOT_IN_libc + INTERNAL_SYSCALL_DECL (err); + pid_t result = INTERNAL_SYSCALL (getpid, err, 0); +#else + pid_t result = THREAD_GETMEM (THREAD_SELF, pid); + if (__builtin_expect (result <= 0, 0)) + result = really_getpid (result); +#endif + return result; +} +libc_hidden_proto(getpid) +weak_alias(__getpid, getpid) +libc_hidden_weak(getpid) |