1 /* Test of posix_spawn() function with 'chdir' action.
2 Copyright (C) 2008-2020 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2018. */
31 #include <sys/types.h>
37 if (0 <= fd
&& fd
<= 2)
39 int f
= fd_safer (dup (fd
));
52 char *argv
[2] = { (char *) "pwd", NULL
};
54 sigset_t blocked_signals
;
55 sigset_t fatal_signal_set
;
56 posix_spawn_file_actions_t actions
;
57 bool actions_allocated
;
58 posix_spawnattr_t attrs
;
68 if (pipe (ifd
) < 0 || (ifd
[0] = fd_safer (ifd
[0])) < 0)
70 perror ("cannot create pipe");
73 sigprocmask (SIG_SETMASK
, NULL
, &blocked_signals
);
74 sigemptyset (&fatal_signal_set
);
75 sigaddset (&fatal_signal_set
, SIGINT
);
76 sigaddset (&fatal_signal_set
, SIGTERM
);
77 sigaddset (&fatal_signal_set
, SIGHUP
);
78 sigaddset (&fatal_signal_set
, SIGPIPE
);
79 sigprocmask (SIG_BLOCK
, &fatal_signal_set
, NULL
);
80 actions_allocated
= false;
81 attrs_allocated
= false;
82 if ((err
= posix_spawn_file_actions_init (&actions
)) != 0
83 || (actions_allocated
= true,
84 (err
= posix_spawn_file_actions_adddup2 (&actions
, ifd
[1], STDOUT_FILENO
)) != 0
85 || (err
= posix_spawn_file_actions_addclose (&actions
, ifd
[1])) != 0
86 || (err
= posix_spawn_file_actions_addclose (&actions
, ifd
[0])) != 0
87 || (err
= posix_spawn_file_actions_addopen (&actions
, STDIN_FILENO
, "/dev/null", O_RDONLY
, 0)) != 0
88 || (err
= posix_spawn_file_actions_addchdir (&actions
, "/")) != 0
89 || (err
= posix_spawnattr_init (&attrs
)) != 0
90 || (attrs_allocated
= true,
91 (err
= posix_spawnattr_setsigmask (&attrs
, &blocked_signals
)) != 0
92 || (err
= posix_spawnattr_setflags (&attrs
, POSIX_SPAWN_SETSIGMASK
)) != 0)
93 || (err
= posix_spawnp (&child
, "pwd", &actions
, &attrs
, argv
, environ
)) != 0))
95 if (actions_allocated
)
96 posix_spawn_file_actions_destroy (&actions
);
98 posix_spawnattr_destroy (&attrs
);
99 sigprocmask (SIG_UNBLOCK
, &fatal_signal_set
, NULL
);
101 perror ("subprocess failed");
104 posix_spawn_file_actions_destroy (&actions
);
105 posix_spawnattr_destroy (&attrs
);
106 sigprocmask (SIG_UNBLOCK
, &fatal_signal_set
, NULL
);
109 fp
= fdopen (fd
, "r");
112 fprintf (stderr
, "fdopen() failed\n");
115 if (fread (line
, 1, 80, fp
) < 2)
117 fprintf (stderr
, "could not read expected output\n");
120 if (memcmp (line
, "/\n", 2) != 0)
122 fprintf (stderr
, "read output is not the expected output");
127 while (waitpid (child
, &status
, 0) != child
)
129 if (!WIFEXITED (status
))
131 fprintf (stderr
, "subprocess terminated with unexpected wait status %d\n", status
);
134 exitstatus
= WEXITSTATUS (status
);
137 fprintf (stderr
, "subprocess terminated with unexpected exit status %d\n", exitstatus
);