common: compile libcommon as C++

[lttng-tools.git] / src / common / daemonize.c

diff --git a/src/common/daemonize.c b/src/common/daemonize.c
deleted file mode 100644 (file)
index 16af5a3..0000000
--- a/src/common/daemonize.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
- * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <unistd.h>
-#include <common/compat/paths.h>
-#include <fcntl.h>
-#include <sys/wait.h>
-#include <stdlib.h>
-
-#include <urcu/system.h>
-
-#include <common/daemonize.h>
-#include <common/error.h>
-
-int lttng_daemonize(pid_t *child_ppid, int *completion_flag,
-               int close_fds)
-{
-       pid_t pid;
-
-       /* Get parent pid of this process. */
-       *child_ppid = getppid();
-
-       pid = fork();
-       if (pid < 0) {
-               PERROR("fork");
-               goto error;
-       } else if (pid == 0) {
-               int fd;
-               pid_t sid;
-               int ret;
-
-               /* Child */
-
-               /*
-                * Get the newly created parent pid so we can signal
-                * that process when we are ready to operate.
-                */
-               *child_ppid = getppid();
-
-               sid = setsid();
-               if (sid < 0) {
-                       PERROR("setsid");
-                       goto error;
-               }
-
-               /*
-                * Try to change directory to /. If we can't well at
-                * least notify.
-                */
-               ret = chdir("/");
-               if (ret < 0) {
-                       PERROR("chdir");
-               }
-
-               if (close_fds) {
-                       fd = open(_PATH_DEVNULL, O_RDWR, 0);
-                       if (fd < 0) {
-                               PERROR("open %s", _PATH_DEVNULL);
-                               /*
-                                * Let 0, 1 and 2 open since we can't
-                                * bind them to /dev/null.
-                                */
-                       } else {
-                               (void) dup2(fd, STDIN_FILENO);
-                               (void) dup2(fd, STDOUT_FILENO);
-                               (void) dup2(fd, STDERR_FILENO);
-                               if (fd > 2) {
-                                       ret = close(fd);
-                                       if (ret < 0) {
-                                               PERROR("close");
-                                       }
-                               }
-                       }
-               }
-               goto end;
-       } else {
-               /* Parent */
-
-               /*
-                * Waiting for child to notify this parent that it can
-                * exit. Note that sleep() is interrupted before the 1
-                * second delay as soon as the signal is received, so it
-                * will not cause visible delay for the user.
-                */
-               while (!CMM_LOAD_SHARED(*completion_flag)) {
-                       int status;
-                       pid_t ret;
-
-                       /*
-                        * Check if child exists without blocking. If
-                        * so, we have to stop this parent process and
-                        * return an error.
-                        */
-                       ret = waitpid(pid, &status, WNOHANG);
-                       if (ret < 0 || (ret != 0 && WIFEXITED(status))) {
-                               /* The child exited somehow or was not valid. */
-                               goto error;
-                       }
-                       sleep(1);
-               }
-
-               /*
-                * From this point on, the parent can exit and the child
-                * is now an operational session daemon ready to serve
-                * clients and applications.
-                */
-               exit(EXIT_SUCCESS);
-       }
-
-end:
-       return 0;
-
-error:
-       return -1;
-}