| /* Copyright (C) 2009-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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 <errno.h> |
| #include <stddef.h> |
| #include <sys/param.h> |
| #include <stdint.h> |
| #if __WORDSIZE == 64 |
| /* Hide the preadv64 declaration. */ |
| # define preadv64 __redirect_preadv64 |
| #endif |
| #include <sys/uio.h> |
| |
| #include <sysdep-cancel.h> |
| #include <sys/syscall.h> |
| #include <kernel-features.h> |
| |
| |
| #ifndef PREADV |
| # define PREADV preadv |
| # define PREADV_REPLACEMENT __atomic_preadv_replacement |
| # define PREAD __pread |
| # define OFF_T off_t |
| #endif |
| |
| #define LO_HI_LONG(val) \ |
| (off_t) val, \ |
| (off_t) ((((uint64_t) (val)) >> (sizeof (long) * 4)) >> (sizeof (long) * 4)) |
| |
| #ifndef __ASSUME_PREADV |
| static ssize_t PREADV_REPLACEMENT (int, const struct iovec *, |
| int, OFF_T) internal_function; |
| #endif |
| |
| |
| ssize_t |
| PREADV (fd, vector, count, offset) |
| int fd; |
| const struct iovec *vector; |
| int count; |
| OFF_T offset; |
| { |
| #ifdef __NR_preadv |
| ssize_t result; |
| |
| if (SINGLE_THREAD_P) |
| result = INLINE_SYSCALL (preadv, 5, fd, vector, count, |
| LO_HI_LONG (offset)); |
| else |
| { |
| int oldtype = LIBC_CANCEL_ASYNC (); |
| |
| result = INLINE_SYSCALL (preadv, 5, fd, vector, count, |
| LO_HI_LONG (offset)); |
| |
| LIBC_CANCEL_RESET (oldtype); |
| } |
| # ifdef __ASSUME_PREADV |
| return result; |
| # endif |
| #endif |
| |
| #ifndef __ASSUME_PREADV |
| # ifdef __NR_preadv |
| if (result >= 0 || errno != ENOSYS) |
| return result; |
| # endif |
| |
| return PREADV_REPLACEMENT (fd, vector, count, offset); |
| #endif |
| } |
| #if __WORDSIZE == 64 |
| # undef preadv64 |
| strong_alias (preadv, preadv64) |
| #endif |
| |
| #ifndef __ASSUME_PREADV |
| # undef PREADV |
| # define PREADV static internal_function PREADV_REPLACEMENT |
| # include <sysdeps/posix/preadv.c> |
| #endif |