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8b9d6054 | 1 | /* Test for vfork functions. |
688903eb | 2 | Copyright (C) 2004-2018 Free Software Foundation, Inc. |
c1b20290 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
c1b20290 UD |
19 | |
20 | #include <errno.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/types.h> | |
25 | #include <sys/wait.h> | |
26 | ||
27 | /* This test relies on non-POSIX functionality since the child | |
8b9d6054 | 28 | processes call write and getpid. */ |
c1b20290 UD |
29 | static int |
30 | do_test (void) | |
31 | { | |
32 | int result = 0; | |
33 | int fd[2]; | |
34 | ||
35 | if (pipe (fd) == -1) | |
36 | { | |
37 | puts ("pipe failed"); | |
38 | return 1; | |
39 | } | |
40 | ||
41 | /* First vfork() without previous getpid(). */ | |
42 | pid_t p1; | |
43 | if ((p1 = vfork ()) == 0) | |
44 | { | |
45 | pid_t p = getpid (); | |
46 | _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p)); | |
47 | } | |
48 | else if (p1 == -1) | |
49 | { | |
50 | puts ("1st vfork failed"); | |
51 | result = 1; | |
52 | } | |
53 | ||
54 | pid_t p2 = 0; | |
55 | if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t))) != sizeof (pid_t)) | |
56 | { | |
57 | puts ("1st read failed"); | |
58 | result = 1; | |
59 | } | |
60 | int r; | |
61 | if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1) | |
62 | { | |
63 | puts ("1st waitpid failed"); | |
64 | result = 1; | |
65 | } | |
66 | else if (r != 0) | |
67 | { | |
68 | puts ("write in 1st child failed"); | |
69 | result = 1; | |
70 | } | |
71 | ||
72 | /* Main process' ID. */ | |
73 | pid_t p0 = getpid (); | |
74 | ||
75 | /* vfork() again, but after a getpid() in the main process. */ | |
76 | pid_t p3; | |
77 | if ((p3 = vfork ()) == 0) | |
78 | { | |
79 | pid_t p = getpid (); | |
80 | _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p)); | |
81 | } | |
82 | else if (p1 == -1) | |
83 | { | |
84 | puts ("2nd vfork failed"); | |
85 | result = 1; | |
86 | } | |
87 | ||
88 | pid_t p4; | |
89 | if (TEMP_FAILURE_RETRY (read (fd[0], &p4, sizeof (pid_t))) != sizeof (pid_t)) | |
90 | { | |
91 | puts ("2nd read failed"); | |
92 | result = 1; | |
93 | } | |
94 | if (TEMP_FAILURE_RETRY (waitpid (p3, &r, 0)) != p3) | |
95 | { | |
96 | puts ("2nd waitpid failed"); | |
97 | result = 1; | |
98 | } | |
99 | else if (r != 0) | |
100 | { | |
101 | puts ("write in 2nd child failed"); | |
102 | result = 1; | |
103 | } | |
104 | ||
105 | /* And getpid in the main process again. */ | |
106 | pid_t p5 = getpid (); | |
107 | ||
108 | /* Analysis of the results. */ | |
109 | if (p0 != p5) | |
110 | { | |
111 | printf ("p0(%ld) != p5(%ld)\n", (long int) p0, (long int) p5); | |
112 | result = 1; | |
113 | } | |
114 | ||
115 | if (p0 == p1) | |
116 | { | |
117 | printf ("p0(%ld) == p1(%ld)\n", (long int) p0, (long int) p1); | |
118 | result = 1; | |
119 | } | |
120 | ||
121 | if (p1 != p2) | |
122 | { | |
123 | printf ("p1(%ld) != p2(%ld)\n", (long int) p1, (long int) p2); | |
124 | result = 1; | |
125 | } | |
126 | ||
127 | if (p0 == p3) | |
128 | { | |
129 | printf ("p0(%ld) == p3(%ld)\n", (long int) p0, (long int) p3); | |
130 | result = 1; | |
131 | } | |
132 | ||
133 | if (p3 != p4) | |
134 | { | |
135 | printf ("p3(%ld) != p4(%ld)\n", (long int) p3, (long int) p4); | |
136 | result = 1; | |
137 | } | |
138 | ||
139 | close (fd[0]); | |
140 | close (fd[1]); | |
141 | ||
142 | if (result == 0) | |
143 | puts ("All OK"); | |
144 | ||
145 | return result; | |
146 | } | |
147 | ||
148 | #define TEST_FUNCTION do_test () | |
149 | #include "../test-skeleton.c" |