1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2022 Oxide Computer Company
14 * Copyright 2022 OmniOS Community Edition (OmniOSce) Association.
15 */
16
17 /*
18 * Regression test for illumos #15294. A change in isatty(3C) caused printf(3C)
19 * to start setting errno on a successful call if the output is not a TTY.
20 */
21
22 #include <err.h>
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <stdarg.h>
26 #include <stdbool.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <strings.h>
31 #include <unistd.h>
32 #include <sys/debug.h>
33 #include <sys/types.h>
34
35 #include "common/openpty.c"
36
37 static int failures;
38
39 static void
fail(const char * fmt,...)40 fail(const char *fmt, ...)
41 {
42 va_list va;
43
44 va_start(va, fmt);
45 (void) vfprintf(stderr, fmt, va);
46 va_end(va);
47
48 failures++;
49 }
50
51 static void
test_file(FILE * fp,char * tag,int e_n,int e_err)52 test_file(FILE *fp, char *tag, int e_n, int e_err)
53 {
54 int n, err;
55
56 errno = 0;
57 n = fprintf(fp, "%s", tag);
58 err = errno;
59
60 if (n != e_n)
61 fail("%s return value was %d, expected %d\n", tag, n, e_n);
62 if (err != e_err)
63 fail("%s errno value was %d, expected %d\n", tag, errno, e_err);
64 }
65
66 int
main(void)67 main(void)
68 {
69 int mfd, sfd;
70 FILE *fp, *sfp;
71
72 if (!openpty(&mfd, &sfd))
73 errx(EXIT_FAILURE, "failed to open a pty");
74 if (isatty(sfd) != 1)
75 errx(EXIT_FAILURE, "subsidiary PTY fd somehow isn't a TTY!");
76
77 fp = tmpfile();
78 if (fp == NULL)
79 errx(EXIT_FAILURE, "could not create temporary file");
80
81 if ((sfp = fdopen(sfd, "w")) == NULL)
82 errx(EXIT_FAILURE, "could not fdopen subsidiary PTY fd");
83
84 test_file(fp, "test non-PTY", sizeof ("test non-PTY") - 1, 0);
85 test_file(sfp, "test PTY", sizeof ("test PTY") - 1, 0);
86
87 VERIFY0(fclose(fp));
88 VERIFY0(fclose(sfp));
89 VERIFY0(close(mfd));
90
91 return (failures);
92 }
93