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001: /* Copyright (C) 1991,1992,1996-1999,2003,2009 Free Software Foundation, Inc.
002:    This file is part of the GNU C Library.
003: 
004:    The GNU C Library is free software; you can redistribute it and/or
005:    modify it under the terms of the GNU Lesser General Public
006:    License as published by the Free Software Foundation; either
007:    version 2.1 of the License, or (at your option) any later version.
008: 
009:    The GNU C Library is distributed in the hope that it will be useful,
010:    but WITHOUT ANY WARRANTY; without even the implied warranty of
011:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012:    Lesser General Public License for more details.
013: 
014:    You should have received a copy of the GNU Lesser General Public
015:    License along with the GNU C Library; if not, write to the Free
016:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
017:    02111-1307 USA.  */
018: 
019: #ifndef _SYS_UIO_H
020: #define _SYS_UIO_H      1
021: 
022: #include <features.h>
023: 
024: #include <sys/types.h>
025: 
026: __BEGIN_DECLS
027: 
028: /* This file defines `struct iovec'.  */
029: #include <bits/uio.h>
030: 
031: 
032: /* Read data from file descriptor FD, and put the result in the
033:    buffers described by IOVEC, which is a vector of COUNT 'struct iovec's.
034:    The buffers are filled in the order specified.
035:    Operates just like 'read' (see <unistd.h>) except that data are
036:    put in IOVEC instead of a contiguous buffer.
037: 
038:    This function is a cancellation point and therefore not marked with
039:    __THROW.  */
040: extern ssize_t readv (int __fd, __const struct iovec *__iovec, int __count)
041:   __wur;
042: 
043: /* Write data pointed by the buffers described by IOVEC, which
044:    is a vector of COUNT 'struct iovec's, to file descriptor FD.
045:    The data is written in the order specified.
046:    Operates just like 'write' (see <unistd.h>) except that the data
047:    are taken from IOVEC instead of a contiguous buffer.
048: 
049:    This function is a cancellation point and therefore not marked with
050:    __THROW.  */
051: extern ssize_t writev (int __fd, __const struct iovec *__iovec, int __count)
052:   __wur;
053: 
054: 
055: #ifdef __USE_BSD
056: # ifndef __USE_FILE_OFFSET64
057: /* Read data from file descriptor FD at the given position OFFSET
058:    without change the file pointer, and put the result in the buffers
059:    described by IOVEC, which is a vector of COUNT 'struct iovec's.
060:    The buffers are filled in the order specified.  Operates just like
061:    'pread' (see <unistd.h>) except that data are put in IOVEC instead
062:    of a contiguous buffer.
063: 
064:    This function is a cancellation point and therefore not marked with
065:    __THROW.  */
066: extern ssize_t preadv (int __fd, __const struct iovec *__iovec, int __count,
067:                        __off_t __offset) __wur;
068: 
069: /* Write data pointed by the buffers described by IOVEC, which is a
070:    vector of COUNT 'struct iovec's, to file descriptor FD at the given
071:    position OFFSET without change the file pointer.  The data is
072:    written in the order specified.  Operates just like 'pwrite' (see
073:    <unistd.h>) except that the data are taken from IOVEC instead of a
074:    contiguous buffer.
075: 
076:    This function is a cancellation point and therefore not marked with
077:    __THROW.  */
078: extern ssize_t pwritev (int __fd, __const struct iovec *__iovec, int __count,
079:                         __off_t __offset) __wur;
080: # else
081: #  ifdef __REDIRECT
082: extern ssize_t __REDIRECT (preadv, (int __fd, __const struct iovec *__iovec,
083:                                     int __count, __off64_t __offset),
084:                            preadv64) __wur;
085: extern ssize_t __REDIRECT (pwritev, (int __fd, __const struct iovec *__iovec,
086:                                      int __count, __off64_t __offset),
087:                            pwritev64) __wur;
088: #  else
089: #   define preadv preadv64
090: #   define pwritev pwritev64
091: #  endif
092: # endif
093: 
094: # ifdef __USE_LARGEFILE64
095: /* Read data from file descriptor FD at the given position OFFSET
096:    without change the file pointer, and put the result in the buffers
097:    described by IOVEC, which is a vector of COUNT 'struct iovec's.
098:    The buffers are filled in the order specified.  Operates just like
099:    '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: 

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