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| author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
|---|---|---|
| committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
| commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
| tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /sysdeps/posix/readv.c | |
| parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
| download | glibc-zack/build-layout-experiment.tar glibc-zack/build-layout-experiment.tar.gz glibc-zack/build-layout-experiment.tar.bz2 glibc-zack/build-layout-experiment.zip | |
Prepare for radical source tree reorganization.zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).
Diffstat (limited to 'sysdeps/posix/readv.c')
| -rw-r--r-- | sysdeps/posix/readv.c | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/sysdeps/posix/readv.c b/sysdeps/posix/readv.c deleted file mode 100644 index 5b0c124e89..0000000000 --- a/sysdeps/posix/readv.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); -} - -/* Read data from file descriptor FD, and put the result in the - buffers described by VECTOR, which is a vector of COUNT 'struct iovec's. - The buffers are filled in the order specified. - Operates just like 'read' (see <unistd.h>) except that data are - put in VECTOR instead of a contiguous buffer. */ -ssize_t -__readv (int fd, const struct iovec *vector, int count) -{ - /* 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; - } - - /* Read the data. */ - ssize_t bytes_read = __read (fd, buffer, bytes); - if (bytes_read < 0) - return -1; - - /* Copy the data from BUFFER into the memory specified by VECTOR. */ - bytes = bytes_read; - for (int i = 0; i < count; ++i) - { - size_t copy = MIN (vector[i].iov_len, bytes); - - (void) memcpy ((void *) vector[i].iov_base, (void *) buffer, copy); - - buffer += copy; - bytes -= copy; - if (bytes == 0) - break; - } - - return bytes_read; -} -weak_alias (__readv, readv) |