diff options
Diffstat (limited to 'sysdeps/posix/pwritev.c')
| -rw-r--r-- | sysdeps/posix/pwritev.c | 79 |
1 files changed, 7 insertions, 72 deletions
diff --git a/sysdeps/posix/pwritev.c b/sysdeps/posix/pwritev.c index 57e641b8b5..f9de092aa5 100644 --- a/sysdeps/posix/pwritev.c +++ b/sysdeps/posix/pwritev.c @@ -1,4 +1,5 @@ -/* Copyright (C) 2009-2017 Free Software Foundation, Inc. +/* Write data into multiple buffers. Generic version. + Copyright (C) 2009-2017 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 @@ -15,81 +16,15 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#include <errno.h> -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <limits.h> -#include <stdbool.h> -#include <sys/param.h> -#if __WORDSIZE == 64 && !defined PWRITEV -/* Hide the pwritev64 declaration. */ -# define pwritev64 __redirect_pwritev64 -#endif -#include <sys/uio.h> -#include <bits/wordsize.h> +#include <sys/types.h> + +#ifndef __OFF_T_MATCHES_OFF64_T -#ifndef PWRITEV # define PWRITEV pwritev # define PWRITE __pwrite # define OFF_T off_t -#endif - - -static void -ifree (char **ptrp) -{ - free (*ptrp); -} - - -/* Write data pointed by the buffers described by IOVEC, which is a - vector of COUNT 'struct iovec's, to file descriptor FD at the given - position OFFSET without change the file pointer. The data is - written in the order specified. Operates just like 'write' (see - <unistd.h>) except that the data are taken from IOVEC instead of a - contiguous buffer. */ -ssize_t -PWRITEV (int fd, const struct iovec *vector, int count, OFF_T offset) -{ - /* Find the total number of bytes to be read. */ - 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) - return -1; - } +# include <sysdeps/posix/pwritev_common.c> - /* Copy the data from BUFFER into the memory specified by VECTOR. */ - char *ptr = buffer; - for (int i = 0; i < count; ++i) - ptr = __mempcpy ((void *) ptr, (void *) vector[i].iov_base, - vector[i].iov_len); +libc_hidden_def (pwritev) - /* Write the data. */ - return PWRITE (fd, buffer, bytes, offset); -} -#if __WORDSIZE == 64 && defined pwritev64 -# undef pwritev64 -strong_alias (pwritev, pwritev64) #endif |