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