3 * Cryptonector LLC. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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13 * 3. Cryptonector LLC may not be used to endorse or promote products
14 * derived from this software without specific prior written
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45 static int pipefds
[2] = {-1, -1};
47 ROKEN_LIB_FUNCTION
void ROKEN_LIB_CALL
48 roken_detach_prep(int argc
, char **argv
, char *special_arg
)
59 if (_pipe(pipefds
, 4, O_BINARY
) == -1)
60 err(1, "failed to setup to detach daemon (_pipe failed)");
62 if (pipe(pipefds
) == -1)
63 err(1, "failed to setup to detach daemon (pipe failed)");
71 intptr_t child_handle
;
77 new_argv
= calloc(argc
+ 2, sizeof(*new_argv
));
79 err(1, "Out of memory");
81 write_side
= _dup(pipefds
[1]); /* The new fd will be inherited */
83 err(1, "Out of memory");
85 if (asprintf(&fildes
, "%d", write_side
) == -1 ||
87 err(1, "failed to setup to detach daemon (_dup failed)");
89 new_argv
[0] = argv
[0];
90 new_argv
[1] = special_arg
;
92 for (i
= 1; argv
[i
] != NULL
; i
++)
93 new_argv
[i
+ 1] = argv
[i
];
94 new_argv
[argc
+ 2] = NULL
;
97 child_handle
= spawnvp(_P_NOWAIT
, argv
[0], new_argv
);
98 if (child_handle
== -1)
101 child
= GetProcessId((HANDLE
)child_handle
);
104 if (child
== (pid_t
)-1)
105 err(1, "failed to setup to fork daemon (fork failed)");
111 (void) close(pipefds
[0]);
114 * Keep stdout/stderr for now so output and errors prior to
115 * detach_finish() can be seen by the user.
117 fd
= open(_PATH_DEVNULL
, O_RDWR
, 0);
119 err(1, "failed to open /dev/null");
120 (void) dup2(fd
, STDIN_FILENO
);
121 if (fd
> STDERR_FILENO
)
127 (void) close(pipefds
[1]);
130 bytes
= read(pipefds
[0], buf
, sizeof(buf
));
131 } while (bytes
== -1 && errno
== EINTR
);
132 (void) close(pipefds
[0]);
136 * No need to wait for the process. We've killed it. If it
137 * doesn't want to exit, we'd have to wait potentially forever,
138 * but we want to indicate failure to the user as soon as
139 * possible. A wait with timeout would end the same way
140 * (attempting to kill the process).
142 err(1, "failed to setup daemon child (read from child pipe)");
145 warnx("daemon child preparation failed, waiting for child");
146 status
= wait_for_process(child
);
147 if (SE_IS_ERROR(status
) || SE_PROCSTATUS(status
) != 0)
148 errx(SE_PROCSTATUS(status
),
149 "daemon child preparation failed (child exited)");
161 ROKEN_LIB_FUNCTION
void ROKEN_LIB_CALL
162 roken_detach_finish(const char *dir
, int daemon_child_fd
)
169 if (pipefds
[1] == -1 && daemon_child_fd
!= -1)
170 pipefds
[1] = daemon_child_fd
;
171 if (pipefds
[0] != -1)
172 (void) close(pipefds
[0]);
173 if (pipefds
[1] == -1)
178 err(1, "failed to detach from tty");
183 * Hopefully we've written any pidfiles by now, if they had to be in
184 * the current directory...
186 * The daemons do re-open logs and so on, therefore this chdir()
187 * call needs to be optional for testing.
189 if (dir
!= NULL
&& chdir(dir
) == -1)
190 err(1, "failed to chdir to /");
194 bytes
= write(pipefds
[1], buf
, sizeof(buf
));
195 } while (bytes
== -1 && errno
== EINTR
);
197 err(1, "failed to signal parent while detaching");
198 (void) close(pipefds
[1]);
199 if (bytes
!= sizeof(buf
))
200 errx(1, "failed to signal parent while detaching");
202 fd
= open(_PATH_DEVNULL
, O_RDWR
, 0);
204 err(1, "failed to open /dev/null");
206 * Maybe we should check that our output got written, if redirected
207 * to a file. File utils normally do this.
209 (void) dup2(fd
, STDOUT_FILENO
);
210 (void) dup2(fd
, STDERR_FILENO
);