1 /* Test of posix_spawn() function with 'fchdir' 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>
39 if (0 <= fd
&& fd
<= 2)
41 int f
= fd_safer (dup (fd
));
52 test (const char *pwd_prog
)
54 char *argv
[2] = { (char *) "pwd", NULL
};
57 sigset_t blocked_signals
;
58 sigset_t fatal_signal_set
;
59 posix_spawn_file_actions_t actions
;
60 bool actions_allocated
;
61 posix_spawnattr_t attrs
;
71 rootfd
= open ("/", O_RDONLY
);
74 perror ("cannot open directory");
77 if (pipe (ifd
) < 0 || (ifd
[0] = fd_safer (ifd
[0])) < 0)
79 perror ("cannot create pipe");
82 sigprocmask (SIG_SETMASK
, NULL
, &blocked_signals
);
83 sigemptyset (&fatal_signal_set
);
84 sigaddset (&fatal_signal_set
, SIGINT
);
85 sigaddset (&fatal_signal_set
, SIGTERM
);
86 sigaddset (&fatal_signal_set
, SIGHUP
);
87 sigaddset (&fatal_signal_set
, SIGPIPE
);
88 sigprocmask (SIG_BLOCK
, &fatal_signal_set
, NULL
);
89 actions_allocated
= false;
90 attrs_allocated
= false;
91 if ((err
= posix_spawn_file_actions_init (&actions
)) != 0
92 || (actions_allocated
= true,
93 (err
= posix_spawn_file_actions_adddup2 (&actions
, ifd
[1], STDOUT_FILENO
)) != 0
94 || (err
= posix_spawn_file_actions_addclose (&actions
, ifd
[1])) != 0
95 || (err
= posix_spawn_file_actions_addclose (&actions
, ifd
[0])) != 0
96 || (err
= posix_spawn_file_actions_addopen (&actions
, STDIN_FILENO
, "/dev/null", O_RDONLY
, 0)) != 0
97 || (err
= posix_spawn_file_actions_addfchdir (&actions
, rootfd
)) != 0
98 || (err
= posix_spawnattr_init (&attrs
)) != 0
99 || (attrs_allocated
= true,
100 (err
= posix_spawnattr_setsigmask (&attrs
, &blocked_signals
)) != 0
101 || (err
= posix_spawnattr_setflags (&attrs
, POSIX_SPAWN_SETSIGMASK
)) != 0)
102 || (err
= posix_spawnp (&child
, pwd_prog
, &actions
, &attrs
, argv
, environ
)) != 0))
104 if (actions_allocated
)
105 posix_spawn_file_actions_destroy (&actions
);
107 posix_spawnattr_destroy (&attrs
);
108 sigprocmask (SIG_UNBLOCK
, &fatal_signal_set
, NULL
);
110 perror ("subprocess failed");
113 posix_spawn_file_actions_destroy (&actions
);
114 posix_spawnattr_destroy (&attrs
);
115 sigprocmask (SIG_UNBLOCK
, &fatal_signal_set
, NULL
);
118 fp
= fdopen (fd
, "r");
121 fprintf (stderr
, "fdopen() failed\n");
124 if (fread (line
, 1, 80, fp
) < 2)
126 fprintf (stderr
, "could not read expected output\n");
129 if (memcmp (line
, "/\n", 2) != 0)
131 fprintf (stderr
, "read output is not the expected output");
136 while (waitpid (child
, &status
, 0) != child
)
138 if (!WIFEXITED (status
))
140 fprintf (stderr
, "subprocess terminated with unexpected wait status %d\n", status
);
143 exitstatus
= WEXITSTATUS (status
);
146 fprintf (stderr
, "subprocess terminated with unexpected exit status %d\n", exitstatus
);
156 /* Verify that if a program is given as a relative file name with at least one
157 slash, it is interpreted w.r.t. the current directory after fchdir has been
160 const char *abs_pwd_prog
= find_in_path ("pwd");
162 if (abs_pwd_prog
!= NULL
163 && abs_pwd_prog
[0] == '/'
164 && abs_pwd_prog
[1] != '0' && abs_pwd_prog
[1] != '/')
165 test (&abs_pwd_prog
[1]);