int fpm_unix_init_main() /* {{{ */
{
struct fpm_worker_pool_s *wp;
fpm_pagesize = getpagesize();
if (fpm_global_config.daemonize) {
switch (fork()) {
case -1 :
zlog(ZLOG_STUFF, ZLOG_SYSERROR, "daemonized fork() failed");
return -1;
case 0 :
break;
default :
fpm_cleanups_run(FPM_CLEANUP_PARENT_EXIT);
exit(0);
}
}
setsid();
if (0 > fpm_clock_init()) {
return -1;
}
fpm_globals.parent_pid = getpid();
for (wp = fpm_worker_all_pools; wp; wp = wp->next) {
if (0 > fpm_unix_conf_wp(wp)) {
return -1;
}
}
fpm_stdio_init_final();
return 0;
}
// 初始化unix
int fpm_unix_init_main() /* {{{ */
{
struct fpm_worker_pool_s *wp;
int is_root = !geteuid();
// 能够打开的最大的文件描述符数量
if (fpm_global_config.rlimit_files) {
struct rlimit r;
r.rlim_max = r.rlim_cur = (rlim_t) fpm_global_config.rlimit_files;
// setrlimit和getrlimit系统调用
if (0 > setrlimit(RLIMIT_NOFILE, &r)) {
zlog(ZLOG_SYSERROR, "failed to set rlimit_core for this pool. Please check your system limits or decrease rlimit_files. setrlimit(RLIMIT_NOFILE, %d)", fpm_global_config.rlimit_files);
return -1;
}
}
// coredump的最大值
if (fpm_global_config.rlimit_core) {
struct rlimit r;
r.rlim_max = r.rlim_cur = fpm_global_config.rlimit_core == -1 ? (rlim_t) RLIM_INFINITY : (rlim_t) fpm_global_config.rlimit_core;
if (0 > setrlimit(RLIMIT_CORE, &r)) {
zlog(ZLOG_SYSERROR, "failed to set rlimit_core for this pool. Please check your system limits or decrease rlimit_core. setrlimit(RLIMIT_CORE, %d)", fpm_global_config.rlimit_core);
return -1;
}
}
// linux页面大小
fpm_pagesize = getpagesize();
// 在守护进程模式下，会folk出子进程,而前台进程会当Init完毕后退出程
if (fpm_global_config.daemonize) {
/*
* If daemonize, the calling process will die soon
* and the master process continues to initialize itself.
*
* The parent process has then to wait for the master
* process to initialize to return a consistent exit
* value. For this pupose, the master process will
* send \"1\" into the pipe if everything went well
* and \"0\" otherwise.
*/
struct timeval tv;
fd_set rfds;
int ret;
// 创建管道，将send_config_pipe两个文件描述符连接起来
if (pipe(fpm_globals.send_config_pipe) == -1) {
zlog(ZLOG_SYSERROR, "failed to create pipe");
return -1;
}
/* then fork */
pid_t pid = fork();
switch (pid) {
case -1 : /* error */
zlog(ZLOG_SYSERROR, "failed to daemonize");
return -1;
case 0 : /* children */
close(fpm_globals.send_config_pipe[0]); /* close the read side of the pipe */
break;
default : /* parent */
close(fpm_globals.send_config_pipe[1]); /* close the write side of the pipe */
/*
* wait for 10s before exiting with error
* the child is supposed to send 1 or 0 into the pipe to tell the parent
* how it goes for it
*/
FD_ZERO(&rfds);
FD_SET(fpm_globals.send_config_pipe[0], &rfds);
tv.tv_sec = 10;
tv.tv_usec = 0;
zlog(ZLOG_DEBUG, "The calling process is waiting for the master process to ping via fd=%d", fpm_globals.send_config_pipe[0]);
ret = select(fpm_globals.send_config_pipe[0] + 1, &rfds, NULL, NULL, &tv);
if (ret == -1) {
zlog(ZLOG_SYSERROR, "failed to select");
exit(FPM_EXIT_SOFTWARE);
}
if (ret) { /* data available */
int readval;
ret = read(fpm_globals.send_config_pipe[0], &readval, sizeof(readval));
if (ret == -1) {
zlog(ZLOG_SYSERROR, "failed to read from pipe");
exit(FPM_EXIT_SOFTWARE);
}
if (ret == 0) {
zlog(ZLOG_ERROR, "no data have been read from pipe");
exit(FPM_EXIT_SOFTWARE);
} else {
// 收到了数据
// 1表示初始化成功
// 0表示失败
if (readval == 1) {
zlog(ZLOG_DEBUG, "I received a valid acknoledge from the master process, I can exit without error");
fpm_cleanups_run(FPM_CLEANUP_PARENT_EXIT);
exit(FPM_EXIT_OK);
} else {
zlog(ZLOG_DEBUG, "The master process returned an error !");
exit(FPM_EXIT_SOFTWARE);
}
}
} else { /* no date sent ! */
zlog(ZLOG_ERROR, "the master process didn't send back its status (via the pipe to the calling process)");
exit(FPM_EXIT_SOFTWARE);
}
exit(FPM_EXIT_SOFTWARE);
}
}
/* continue as a child */
setsid();
if (0 > fpm_clock_init()) {
return -1;
}
// 设置php-fpm进程的优先级
if (fpm_global_config.process_priority != 64) {
if (is_root) {
if (setpriority(PRIO_PROCESS, 0, fpm_global_config.process_priority) < 0) {
zlog(ZLOG_SYSERROR, "Unable to set priority for the master process");
return -1;
}
} else {
zlog(ZLOG_NOTICE, "'process.priority' directive is ignored when FPM is not running as root");
}
}
// 设置master进程的pid
fpm_globals.parent_pid = getpid();
for (wp = fpm_worker_all_pools; wp; wp = wp->next) {
if (0 > fpm_unix_conf_wp(wp)) {
return -1;
}
}
return 0;
}
