| /* Copyright (C) 1997,1998,1999,2000,2002,2003,2006 |
| Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| |
| 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 <assert.h> |
| #include <errno.h> |
| #include <unistd.h> |
| |
| #include <sysdep-cancel.h> |
| #include <sys/syscall.h> |
| #include <bp-checks.h> |
| |
| #include <kernel-features.h> |
| |
| #if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0 |
| |
| # if __ASSUME_PREAD_SYSCALL == 0 |
| static ssize_t __emulate_pread (int fd, void *buf, size_t count, |
| off_t offset) internal_function; |
| # endif |
| |
| |
| ssize_t |
| __libc_pread (fd, buf, count, offset) |
| int fd; |
| void *buf; |
| size_t count; |
| off_t offset; |
| { |
| ssize_t result; |
| |
| if (SINGLE_THREAD_P) |
| { |
| /* On PPC32 64bit values are aligned in odd/even register pairs. */ |
| result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count, |
| 0, offset >> 31, offset); |
| # if __ASSUME_PREAD_SYSCALL == 0 |
| if (result == -1 && errno == ENOSYS) |
| /* No system call available. Use the emulation. */ |
| result = __emulate_pread (fd, buf, count, offset); |
| # endif |
| |
| return result; |
| } |
| |
| int oldtype = LIBC_CANCEL_ASYNC (); |
| |
| /* On PPC32 64bit values are aligned in odd/even register pairs. */ |
| result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count, |
| 0, offset >> 31, offset); |
| # if __ASSUME_PREAD_SYSCALL == 0 |
| if (result == -1 && errno == ENOSYS) |
| /* No system call available. Use the emulation. */ |
| result = __emulate_pread (fd, buf, count, offset); |
| # endif |
| |
| LIBC_CANCEL_RESET (oldtype); |
| |
| return result; |
| } |
| |
| strong_alias (__libc_pread, __pread) |
| weak_alias (__libc_pread, pread) |
| |
| # define __libc_pread(fd, buf, count, offset) \ |
| static internal_function __emulate_pread (fd, buf, count, offset) |
| #endif |
| |
| #if __ASSUME_PREAD_SYSCALL == 0 |
| # include <sysdeps/posix/pread.c> |
| #endif |