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1d2736d4 PA |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
e2882c85 | 3 | Copyright 2016-2018 Free Software Foundation, Inc. |
1d2736d4 PA |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <stdio.h> | |
19 | #include <stdlib.h> | |
20 | #include <unistd.h> | |
21 | #include <assert.h> | |
6ccb54e2 | 22 | #include <sys/wait.h> |
1d2736d4 PA |
23 | |
24 | int fds[2] = { -1, -1 }; | |
25 | ||
26 | static void | |
27 | grandparent_done (void) | |
28 | { | |
29 | } | |
30 | ||
31 | /* The exp file overrides this in order to test both fork and | |
32 | vfork. */ | |
33 | #ifndef FORK | |
34 | #define FORK fork | |
35 | #endif | |
36 | ||
37 | int | |
38 | main (void) | |
39 | { | |
40 | int pid; | |
41 | int nbytes; | |
42 | const char string[] = "Hello, world!\n"; | |
43 | char readbuffer[80]; | |
44 | ||
45 | /* Don't run forever. */ | |
46 | alarm (300); | |
47 | ||
48 | /* Create a pipe. The write side will be inherited all the way to | |
49 | the grandchild. The grandparent will read this, expecting to see | |
50 | EOF (meaning the grandchild closed the pipe). */ | |
51 | pipe (fds); | |
52 | ||
53 | pid = FORK (); | |
54 | if (pid < 0) | |
55 | { | |
56 | perror ("fork"); | |
57 | exit (1); | |
58 | } | |
59 | else if (pid == 0) | |
60 | { | |
61 | /* Close input side of pipe. */ | |
62 | close (fds[0]); | |
63 | ||
64 | pid = FORK (); | |
65 | if (pid == 0) | |
66 | { | |
67 | printf ("I'm the grandchild!\n"); | |
68 | ||
69 | /* Don't explicitly close the pipe. If GDB fails to kill | |
70 | this process, then the grandparent will hang in the pipe | |
71 | read below. */ | |
72 | #if 0 | |
73 | close (fds[1]); | |
74 | #endif | |
75 | while (1) | |
76 | sleep (1); | |
77 | } | |
78 | else | |
79 | { | |
80 | close (fds[1]); | |
81 | printf ("I'm the proud parent of child #%d!\n", pid); | |
82 | wait (NULL); | |
83 | } | |
84 | } | |
85 | else if (pid > 0) | |
86 | { | |
87 | close (fds[1]); | |
88 | printf ("I'm the proud parent of child #%d!\n", pid); | |
89 | nbytes = read (fds[0], readbuffer, sizeof (readbuffer)); | |
90 | assert (nbytes == 0); | |
91 | printf ("read returned nbytes=%d\n", nbytes); | |
92 | wait (NULL); | |
93 | ||
94 | grandparent_done (); | |
95 | } | |
96 | ||
97 | return 0; | |
98 | } |