/*
|
* Close stdin, move stdout to a non-standard descriptor, and print.
|
*
|
* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
|
* All rights reserved.
|
*
|
* Redistribution and use in source and binary forms, with or without
|
* modification, are permitted provided that the following conditions
|
* are met:
|
* 1. Redistributions of source code must retain the above copyright
|
* notice, this list of conditions and the following disclaimer.
|
* 2. Redistributions in binary form must reproduce the above copyright
|
* notice, this list of conditions and the following disclaimer in the
|
* documentation and/or other materials provided with the distribution.
|
* 3. The name of the author may not be used to endorse or promote products
|
* derived from this software without specific prior written permission.
|
*
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
*/
|
|
#include "tests.h"
|
|
#include <assert.h>
|
#include <errno.h>
|
#include <stdarg.h>
|
#include <stdio.h>
|
#include <unistd.h>
|
|
static ssize_t
|
write_retry(int fd, const void *buf, size_t count)
|
{
|
ssize_t rc;
|
|
do {
|
errno = 0;
|
rc = write(fd, buf, count);
|
} while (rc == -1 && EINTR == errno);
|
|
if (rc <= 0)
|
perror_msg_and_fail("write");
|
|
return rc;
|
}
|
|
static void
|
write_loop(int fd, const char *buf, size_t count)
|
{
|
ssize_t offset = 0;
|
|
while (count > 0) {
|
ssize_t block = write_retry(fd, &buf[offset], count);
|
|
offset += block;
|
count -= (size_t) block;
|
}
|
}
|
|
void
|
tprintf(const char *fmt, ...)
|
{
|
static int initialized;
|
if (!initialized) {
|
assert(dup2(1, 3) == 3);
|
assert(close(1) == 0);
|
(void) close(0);
|
initialized = 1;
|
}
|
|
va_list p;
|
va_start(p, fmt);
|
|
static char buf[65536];
|
int len = vsnprintf(buf, sizeof(buf), fmt, p);
|
if (len < 0)
|
perror_msg_and_fail("vsnprintf");
|
assert((unsigned) len < sizeof(buf));
|
|
write_loop(3, buf, len);
|
|
va_end(p);
|
}
|
