1 /* 2 * Close stdin, move stdout to a non-standard descriptor, and print. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 17 * 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. 28 */ 29 30 #include "tests.h" 31 32 #include <assert.h> 33 #include <errno.h> 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include <unistd.h> 37 38 static ssize_t 39 write_retry(int fd, const void *buf, size_t count) 40 { 41 ssize_t rc; 42 43 do { 44 errno = 0; 45 rc = write(fd, buf, count); 46 } while (rc == -1 && EINTR == errno); 47 48 if (rc <= 0) 49 perror_msg_and_fail("write"); 50 51 return rc; 52 } 53 54 static void 55 write_loop(int fd, const char *buf, size_t count) 56 { 57 ssize_t offset = 0; 58 59 while (count > 0) { 60 ssize_t block = write_retry(fd, &buf[offset], count); 61 62 offset += block; 63 count -= (size_t) block; 64 } 65 } 66 67 void 68 tprintf(const char *fmt, ...) 69 { 70 static int initialized; 71 if (!initialized) { 72 assert(dup2(1, 3) == 3); 73 assert(close(1) == 0); 74 (void) close(0); 75 initialized = 1; 76 } 77 78 va_list p; 79 va_start(p, fmt); 80 81 static char buf[65536]; 82 int len = vsnprintf(buf, sizeof(buf), fmt, p); 83 if (len < 0) 84 perror_msg_and_fail("vsnprintf"); 85 assert((unsigned) len < sizeof(buf)); 86 87 write_loop(3, buf, len); 88 89 va_end(p); 90 } 91
