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45 static int pipefds[2] = {-1, -1};
47 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
48 roken_detach_prep(int argc, char **argv, char *special_arg)
62 if (_pipe(pipefds, 4, _O_NOINHERIT | O_BINARY) == -1)
63 err(1, "failed to setup to detach daemon (_pipe failed)");
65 if (pipe(pipefds) == -1)
66 err(1, "failed to setup to detach daemon (pipe failed)");
69 new_argv = calloc(argc + 3, sizeof(*new_argv));
71 err(1, "Out of memory");
74 pipefds[1] = _dup(pipefds[1]); /* The new fd will be inherited */
76 err(1, "Out of memory");
78 fcntl(pipefds[1], F_SETFD, fcntl(pipefds[1], F_GETFD & ~(O_CLOEXEC)));
81 if (snprintf(fildes, sizeof(fildes), "%d", pipefds[1]) >= sizeof(fildes))
82 err(1, "failed to setup to detach daemon (fd number %d too large)",
85 new_argv[0] = argv[0];
86 new_argv[1] = special_arg;
88 for (i = 1; argv[i] != NULL; i++)
89 new_argv[i + 2] = argv[i];
90 new_argv[argc + 2] = NULL;
97 intptr_t child_handle;
100 child_handle = spawnvp(_P_NOWAIT, argv[0], new_argv);
101 if (child_handle == -1)
104 child = GetProcessId((HANDLE)child_handle);
107 if (child == (pid_t)-1)
108 err(1, "failed to setup to fork daemon (fork failed)");
114 (void) close(pipefds[0]);
117 * Keep stdout/stderr for now so output and errors prior to
118 * detach_finish() can be seen by the user.
120 fd = open(_PATH_DEVNULL, O_RDWR, 0);
122 err(1, "failed to open /dev/null");
123 (void) dup2(fd, STDIN_FILENO);
124 if (fd > STDERR_FILENO)
126 if (getenv("ROKEN_DETACH_USE_EXEC")) {
127 (void) execvp(argv[0], new_argv);
128 err(1, "failed to self-re-exec");
137 (void) close(pipefds[1]);
140 bytes = read(pipefds[0], buf, sizeof(buf));
141 } while (bytes == -1 && errno == EINTR);
142 (void) close(pipefds[0]);
146 * No need to wait for the process. We've killed it. If it
147 * doesn't want to exit, we'd have to wait potentially forever,
148 * but we want to indicate failure to the user as soon as
149 * possible. A wait with timeout would end the same way
150 * (attempting to kill the process).
152 err(1, "failed to setup daemon child (read from child pipe)");
155 warnx("daemon child preparation failed, waiting for child");
156 status = wait_for_process(child);
157 if (SE_IS_ERROR(status) || SE_PROCSTATUS(status) != 0)
158 errx(SE_PROCSTATUS(status),
159 "daemon child preparation failed (child exited)");
173 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
174 roken_detach_finish(const char *dir, int daemon_child_fd)
181 if (pipefds[1] == -1 && daemon_child_fd != -1)
182 pipefds[1] = daemon_child_fd;
183 if (pipefds[0] != -1)
184 (void) close(pipefds[0]);
185 if (pipefds[1] == -1)
190 err(1, "failed to detach from tty");
195 * Hopefully we've written any pidfiles by now, if they had to be in
196 * the current directory...
198 * The daemons do re-open logs and so on, therefore this chdir()
199 * call needs to be optional for testing.
201 if (dir != NULL && chdir(dir) == -1)
202 err(1, "failed to chdir to /");
206 bytes = write(pipefds[1], buf, sizeof(buf));
207 } while (bytes == -1 && errno == EINTR);
209 err(1, "failed to signal parent while detaching");
210 (void) close(pipefds[1]);
211 if (bytes != sizeof(buf))
212 errx(1, "failed to signal parent while detaching");
214 fd = open(_PATH_DEVNULL, O_RDWR, 0);
216 err(1, "failed to open /dev/null");
218 * Maybe we should check that our output got written, if redirected
219 * to a file. File utils normally do this.
221 (void) dup2(fd, STDOUT_FILENO);
222 (void) dup2(fd, STDERR_FILENO);