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Diffstat (limited to 'sysdeps/posix/pwritev_common.c')
-rw-r--r-- | sysdeps/posix/pwritev_common.c | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/sysdeps/posix/pwritev_common.c b/sysdeps/posix/pwritev_common.c deleted file mode 100644 index 03830650e4..0000000000 --- a/sysdeps/posix/pwritev_common.c +++ /dev/null @@ -1,72 +0,0 @@ -/* Write data into multiple buffers. Base implementation for pwritev - and pwritev64. - Copyright (C) 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 <unistd.h> -#include <sys/uio.h> -#include <sys/param.h> -#include <errno.h> -#include <malloc.h> - -#include <ldsodefs.h> - -/* 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. It could be done with a - stack allocation, but due limitations on some system (Linux with - O_DIRECT) it aligns the buffer to pagesize. A possible optimization - would be querying if the syscall would impose any alignment constraint, - but 1. it is system specific (not meant in generic implementation), and - 2. it would make the implementation more complex, and 3. it will require - another syscall (fcntl). */ - void *buffer = NULL; - if (__posix_memalign (&buffer, GLRO(dl_pagesize), bytes) != 0) - return -1; - - /* 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); - - ssize_t ret = PWRITE (fd, buffer, bytes, offset); - - free (buffer); - - return ret; -} |