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- /* 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>
- #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
- extern __typeof(getpid) __getpid;
- 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)
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