1/* Copyright (C) 2004-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <stdio.h>
19#include <string.h>
20#include <wchar.h>
21
22static int
23do_test (void)
24{
25 FILE *f = popen (command: "echo test", modes: "r");
26 int result = 0, ret;
27 char *line = NULL;
28 size_t len = 0;
29
30 if (f == NULL)
31 {
32 printf (format: "popen failed %m");
33 return 1;
34 }
35
36 /* POSIX says that pipe streams are byte-oriented. */
37 if (fwide (fp: f, mode: 0) >= 0)
38 {
39 puts (s: "popen did not return byte-oriented stream");
40 result = 1;
41 }
42
43 if (getline (lineptr: &line, n: &len, stream: f) != 5)
44 {
45 puts (s: "could not read line from popen");
46 result = 1;
47 }
48 else if (strcmp (line, "test\n") != 0)
49 {
50 printf (format: "read \"%s\"\n", line);
51 result = 1;
52 }
53
54 if (getline (lineptr: &line, n: &len, stream: f) != -1)
55 {
56 puts (s: "second getline did not return -1");
57 result = 1;
58 }
59
60 ret = pclose (stream: f);
61 if (ret != 0)
62 {
63 printf (format: "pclose returned %d\n", ret);
64 result = 1;
65 }
66
67 return result;
68}
69
70#define TEST_FUNCTION do_test ()
71#include "../test-skeleton.c"
72

source code of glibc/stdio-common/tst-popen.c