2 * Close stdin, move stdout to a non-standard descriptor, and print.
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 write_retry(int fd, const void *buf, size_t count)
45 rc = write(fd, buf, count);
46 } while (rc == -1 && EINTR == errno);
49 perror_msg_and_fail("write");
55 write_loop(int fd, const char *buf, size_t count)
60 ssize_t block = write_retry(fd, &buf[offset], count);
63 count -= (size_t) block;
68 tprintf(const char *fmt, ...)
70 static int initialized;
72 assert(dup2(1, 3) == 3);
73 assert(close(1) == 0);
81 static char buf[65536];
82 int len = vsnprintf(buf, sizeof(buf), fmt, p);
84 perror_msg_and_fail("vsnprintf");
85 assert((unsigned) len < sizeof(buf));
87 write_loop(3, buf, len);