Hash :
a4fd2b6f
Author :
Date :
2018-05-05T10:27:38
sys-limits.h: new file for crypto and safe I/O * lib/af_alg.c: Include sys-limits.h. (MAX_RW_COUNT): Remove. Use replaced by SYS_BUFSIZE_MAX. (afalg_stream): Also reject negative sizes for sendfile; they should not happen and the code is a bit cleaner and faster this way. * lib/safe-read.c: Include sys-limits.h. (BUGGY_READ_MAXIMUM): Remove. All uses replaced by SYS_BUFSIZE_MAX. * lib/sys-limits.h: New file, with values and commentary derived from the old safe-read.c and from GNU Emacs sysdep.c. * modules/crypto/md5, modules/crypto/sha1, modules/crypto/sha256: * modules/crypto/sha512, modules/safe-read, modules/safe-write: Add lib/sys-limits.h to Files section.
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/* An interface to read and write that retries after interrupts.
Copyright (C) 1993-1994, 1998, 2002-2006, 2009-2018 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#ifdef SAFE_WRITE
# include "safe-write.h"
#else
# include "safe-read.h"
#endif
/* Get ssize_t. */
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#ifdef EINTR
# define IS_EINTR(x) ((x) == EINTR)
#else
# define IS_EINTR(x) 0
#endif
#include "sys-limits.h"
#ifdef SAFE_WRITE
# define safe_rw safe_write
# define rw write
#else
# define safe_rw safe_read
# define rw read
# undef const
# define const /* empty */
#endif
/* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if
interrupted. Return the actual number of bytes read(written), zero for EOF,
or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error. */
size_t
safe_rw (int fd, void const *buf, size_t count)
{
for (;;)
{
ssize_t result = rw (fd, buf, count);
if (0 <= result)
return result;
else if (IS_EINTR (errno))
continue;
else if (errno == EINVAL && SYS_BUFSIZE_MAX < count)
count = SYS_BUFSIZE_MAX;
else
return result;
}
}