1 /* Copyright (C) 1991,1992,1996-1999,2003,2009,2012 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_UIO_H 20 #define _SYS_UIO_H 1 21 22 #include <features.h> 23 24 #include <sys/types.h> 25 26 __BEGIN_DECLS 27 28 /* This file defines `struct iovec'. */ 29 #include <bits/uio.h> 30 31 32 /* Read data from file descriptor FD, and put the result in the 33 buffers described by IOVEC, which is a vector of COUNT 'struct iovec's. 34 The buffers are filled in the order specified. 35 Operates just like 'read' (see <unistd.h>) except that data are 36 put in IOVEC instead of a contiguous buffer. 37 38 This function is a cancellation point and therefore not marked with 39 __THROW. */ 40 extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count) 41 __wur; 42 43 /* Write data pointed by the buffers described by IOVEC, which 44 is a vector of COUNT 'struct iovec's, to file descriptor FD. 45 The data is written in the order specified. 46 Operates just like 'write' (see <unistd.h>) except that the data 47 are taken from IOVEC instead of a contiguous buffer. 48 49 This function is a cancellation point and therefore not marked with 50 __THROW. */ 51 extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count) 52 __wur; 53 54 55 #ifdef __USE_BSD 56 # ifndef __USE_FILE_OFFSET64 57 /* Read data from file descriptor FD at the given position OFFSET 58 without change the file pointer, and put the result in the buffers 59 described by IOVEC, which is a vector of COUNT 'struct iovec's. 60 The buffers are filled in the order specified. Operates just like 61 'pread' (see <unistd.h>) except that data are put in IOVEC instead 62 of a contiguous buffer. 63 64 This function is a cancellation point and therefore not marked with 65 __THROW. */ 66 extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count, 67 __off_t __offset) __wur; 68 69 /* Write data pointed by the buffers described by IOVEC, which is a 70 vector of COUNT 'struct iovec's, to file descriptor FD at the given 71 position OFFSET without change the file pointer. The data is 72 written in the order specified. Operates just like 'pwrite' (see 73 <unistd.h>) except that the data are taken from IOVEC instead of a 74 contiguous buffer. 75 76 This function is a cancellation point and therefore not marked with 77 __THROW. */ 78 extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count, 79 __off_t __offset) __wur; 80 # else 81 # ifdef __REDIRECT 82 extern ssize_t __REDIRECT (preadv, (int __fd, const struct iovec *__iovec, 83 int __count, __off64_t __offset), 84 preadv64) __wur; 85 extern ssize_t __REDIRECT (pwritev, (int __fd, const struct iovec *__iovec, 86 int __count, __off64_t __offset), 87 pwritev64) __wur; 88 # else 89 # define preadv preadv64 90 # define pwritev pwritev64 91 # endif 92 # endif 93 94 # ifdef __USE_LARGEFILE64 95 /* Read data from file descriptor FD at the given position OFFSET 96 without change the file pointer, and put the result in the buffers 97 described by IOVEC, which is a vector of COUNT 'struct iovec's. 98 The buffers are filled in the order specified. Operates just like 99 'pread' (see <unistd.h>) except that data are put in IOVEC instead 100 of a contiguous buffer. 101 102 This function is a cancellation point and therefore not marked with 103 __THROW. */ 104 extern ssize_t preadv64 (int __fd, const struct iovec *__iovec, int __count, 105 __off64_t __offset) __wur; 106 107 /* Write data pointed by the buffers described by IOVEC, which is a 108 vector of COUNT 'struct iovec's, to file descriptor FD at the given 109 position OFFSET without change the file pointer. The data is 110 written in the order specified. Operates just like 'pwrite' (see 111 <unistd.h>) except that the data are taken from IOVEC instead of a 112 contiguous buffer. 113 114 This function is a cancellation point and therefore not marked with 115 __THROW. */ 116 extern ssize_t pwritev64 (int __fd, const struct iovec *__iovec, int __count, 117 __off64_t __offset) __wur; 118 # endif 119 #endif /* Use BSD */ 120 121 __END_DECLS 122 123 #endif /* sys/uio.h */ 124