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