| /* Copyright (C) 2003-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <unistd.h> |
| #include <tls.h> |
| #include <sysdep.h> |
| |
| |
| #ifndef NOT_IN_libc |
| static inline __attribute__((always_inline)) pid_t really_getpid (pid_t oldval); |
| |
| static inline __attribute__((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_def (__getpid) |
| weak_alias (__getpid, getpid) |
| libc_hidden_def (getpid) |