diff options
Diffstat (limited to 'sysdeps/posix/writev.c')
-rw-r--r-- | sysdeps/posix/writev.c | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/sysdeps/posix/writev.c b/sysdeps/posix/writev.c deleted file mode 100644 index 7ce1deb80f..0000000000 --- a/sysdeps/posix/writev.c +++ /dev/null @@ -1,91 +0,0 @@ -/* Copyright (C) 1991-2017 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 <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <limits.h> -#include <stdbool.h> -#include <sys/param.h> -#include <sys/uio.h> -#include <errno.h> - - -static void -ifree (char **ptrp) -{ - free (*ptrp); -} - - -/* Write data pointed by the buffers described by VECTOR, which - is a vector of COUNT 'struct iovec's, to file descriptor FD. - The data is written in the order specified. - Operates just like 'write' (see <unistd.h>) except that the data - are taken from VECTOR instead of a contiguous buffer. */ -ssize_t -__writev (int fd, const struct iovec *vector, int count) -{ - /* Find the total number of bytes to be written. */ - size_t bytes = 0; - for (int i = 0; i < count; ++i) - { - /* Check for ssize_t overflow. */ - if (SSIZE_MAX - bytes < vector[i].iov_len) - { - __set_errno (EINVAL); - return -1; - } - bytes += vector[i].iov_len; - } - - /* Allocate a temporary buffer to hold the data. We should normally - use alloca since it's faster and does not require synchronization - with other threads. But we cannot if the amount of memory - required is too large. */ - char *buffer; - char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL; - if (__libc_use_alloca (bytes)) - buffer = (char *) __alloca (bytes); - else - { - malloced_buffer = buffer = (char *) malloc (bytes); - if (buffer == NULL) - /* XXX I don't know whether it is acceptable to try writing - the data in chunks. Probably not so we just fail here. */ - return -1; - } - - /* Copy the data into BUFFER. */ - size_t to_copy = bytes; - char *bp = buffer; - for (int i = 0; i < count; ++i) - { - size_t copy = MIN (vector[i].iov_len, to_copy); - - bp = __mempcpy ((void *) bp, (void *) vector[i].iov_base, copy); - - to_copy -= copy; - if (to_copy == 0) - break; - } - - ssize_t bytes_written = __write (fd, buffer, bytes); - - return bytes_written; -} -weak_alias (__writev, writev) |