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/* $OpenBSD: atomic.c,v 1.3 2008/11/05 12:49:58 sobrado Exp $ */
/*
* Copyright (c) 2008 Gilles Chehade <gilles@openbsd.org>
* Copyright (c) 2008 Charles Longeau <chl@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "smtpd.h"
ssize_t
atomic_write(int d, const void *buf, size_t nbytes)
{
ssize_t ret;
size_t n = nbytes;
do {
ret = write(d, buf, n);
if (ret == -1 && errno != EINTR)
return -1;
if (ret != -1)
n -= ret;
} while (n > 0 || (ret == -1 && errno == EINTR));
return nbytes;
}
ssize_t
atomic_read(int d, void *buf, size_t nbytes)
{
ssize_t ret;
size_t n = nbytes;
do {
ret = read(d, buf, n);
if (ret == -1 && errno != EINTR)
return -1;
if (ret != -1)
n -= ret;
if (ret == 0 && n != 0)
return -1;
} while (n > 0 || (ret == -1 && errno == EINTR));
return nbytes;
}
ssize_t
atomic_printfd(int d, const char *fmt, ...)
{
int ret;
char *buf;
va_list ap;
va_start(ap, fmt);
if ((ret = vasprintf(&buf, fmt, ap)) == -1) {
va_end(ap);
return -1;
}
va_end(ap);
ret = atomic_write(d, buf, ret);
free(buf);
return ret;
}
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