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/* (c) 2007,2008 Andrei Nigmatulin */
#include "fpm_config.h"
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "fpm.h"
#include "fpm_signals.h"
#include "fpm_sockets.h"
#include "fpm_php.h"
#include "zlog.h"
static int sp[2];
static sigset_t block_sigset;
static sigset_t child_block_sigset;
const char *fpm_signal_names[NSIG + 1] = {
#ifdef SIGHUP
[SIGHUP] = "SIGHUP",
#endif
#ifdef SIGINT
[SIGINT] = "SIGINT",
#endif
#ifdef SIGQUIT
[SIGQUIT] = "SIGQUIT",
#endif
#ifdef SIGILL
[SIGILL] = "SIGILL",
#endif
#ifdef SIGTRAP
[SIGTRAP] = "SIGTRAP",
#endif
#ifdef SIGABRT
[SIGABRT] = "SIGABRT",
#endif
#ifdef SIGEMT
[SIGEMT] = "SIGEMT",
#endif
#ifdef SIGBUS
[SIGBUS] = "SIGBUS",
#endif
#ifdef SIGFPE
[SIGFPE] = "SIGFPE",
#endif
#ifdef SIGKILL
[SIGKILL] = "SIGKILL",
#endif
#ifdef SIGUSR1
[SIGUSR1] = "SIGUSR1",
#endif
#ifdef SIGSEGV
[SIGSEGV] = "SIGSEGV",
#endif
#ifdef SIGUSR2
[SIGUSR2] = "SIGUSR2",
#endif
#ifdef SIGPIPE
[SIGPIPE] = "SIGPIPE",
#endif
#ifdef SIGALRM
[SIGALRM] = "SIGALRM",
#endif
#ifdef SIGTERM
[SIGTERM] = "SIGTERM",
#endif
#ifdef SIGCHLD
[SIGCHLD] = "SIGCHLD",
#endif
#ifdef SIGCONT
[SIGCONT] = "SIGCONT",
#endif
#ifdef SIGSTOP
[SIGSTOP] = "SIGSTOP",
#endif
#ifdef SIGTSTP
[SIGTSTP] = "SIGTSTP",
#endif
#ifdef SIGTTIN
[SIGTTIN] = "SIGTTIN",
#endif
#ifdef SIGTTOU
[SIGTTOU] = "SIGTTOU",
#endif
#ifdef SIGURG
[SIGURG] = "SIGURG",
#endif
#ifdef SIGXCPU
[SIGXCPU] = "SIGXCPU",
#endif
#ifdef SIGXFSZ
[SIGXFSZ] = "SIGXFSZ",
#endif
#ifdef SIGVTALRM
[SIGVTALRM] = "SIGVTALRM",
#endif
#ifdef SIGPROF
[SIGPROF] = "SIGPROF",
#endif
#ifdef SIGWINCH
[SIGWINCH] = "SIGWINCH",
#endif
#ifdef SIGINFO
[SIGINFO] = "SIGINFO",
#endif
#ifdef SIGIO
[SIGIO] = "SIGIO",
#endif
#ifdef SIGPWR
[SIGPWR] = "SIGPWR",
#endif
#ifdef SIGSYS
[SIGSYS] = "SIGSYS",
#endif
#ifdef SIGWAITING
[SIGWAITING] = "SIGWAITING",
#endif
#ifdef SIGLWP
[SIGLWP] = "SIGLWP",
#endif
#ifdef SIGFREEZE
[SIGFREEZE] = "SIGFREEZE",
#endif
#ifdef SIGTHAW
[SIGTHAW] = "SIGTHAW",
#endif
#ifdef SIGCANCEL
[SIGCANCEL] = "SIGCANCEL",
#endif
#ifdef SIGLOST
[SIGLOST] = "SIGLOST",
#endif
};
static void sig_soft_quit(int signo) /* {{{ */
{
int saved_errno = errno;
/* closing fastcgi listening socket will force fcgi_accept() exit immediately */
close(fpm_globals.listening_socket);
if (0 > socket(AF_UNIX, SOCK_STREAM, 0)) {
zlog(ZLOG_WARNING, "failed to create a new socket");
}
fpm_php_soft_quit();
errno = saved_errno;
}
/* }}} */
static void sig_handler(int signo) /* {{{ */
{
static const char sig_chars[NSIG + 1] = {
[SIGTERM] = 'T',
[SIGINT] = 'I',
[SIGUSR1] = '1',
[SIGUSR2] = '2',
[SIGQUIT] = 'Q',
[SIGCHLD] = 'C'
};
char s;
int saved_errno;
if (fpm_globals.parent_pid != getpid()) {
/* Avoid using of signal handlers from the master process in a worker
before the child sets up its own signal handlers.
Normally it is prevented by the sigprocmask() calls
around fork(). This execution branch is a last resort trap
that has no protection against #76601. */
return;
}
saved_errno = errno;
s = sig_chars[signo];
zend_quiet_write(sp[1], &s, sizeof(s));
errno = saved_errno;
}
/* }}} */
int fpm_signals_init_main() /* {{{ */
{
struct sigaction act;
if (0 > socketpair(AF_UNIX, SOCK_STREAM, 0, sp)) {
zlog(ZLOG_SYSERROR, "failed to init signals: socketpair()");
return -1;
}
if (0 > fd_set_blocked(sp[0], 0) || 0 > fd_set_blocked(sp[1], 0)) {
zlog(ZLOG_SYSERROR, "failed to init signals: fd_set_blocked()");
return -1;
}
if (0 > fcntl(sp[0], F_SETFD, FD_CLOEXEC) || 0 > fcntl(sp[1], F_SETFD, FD_CLOEXEC)) {
zlog(ZLOG_SYSERROR, "failed to init signals: fcntl(F_SETFD, FD_CLOEXEC)");
return -1;
}
memset(&act, 0, sizeof(act));
act.sa_handler = sig_handler;
sigfillset(&act.sa_mask);
if (0 > sigaction(SIGTERM, &act, 0) ||
0 > sigaction(SIGINT, &act, 0) ||
0 > sigaction(SIGUSR1, &act, 0) ||
0 > sigaction(SIGUSR2, &act, 0) ||
0 > sigaction(SIGCHLD, &act, 0) ||
0 > sigaction(SIGQUIT, &act, 0)) {
zlog(ZLOG_SYSERROR, "failed to init signals: sigaction()");
return -1;
}
zlog(ZLOG_DEBUG, "Unblocking all signals");
if (0 > fpm_signals_unblock()) {
return -1;
}
return 0;
}
/* }}} */
int fpm_signals_init_child() /* {{{ */
{
struct sigaction act, act_dfl;
memset(&act, 0, sizeof(act));
memset(&act_dfl, 0, sizeof(act_dfl));
act.sa_handler = &sig_soft_quit;
act.sa_flags |= SA_RESTART;
act_dfl.sa_handler = SIG_DFL;
close(sp[0]);
close(sp[1]);
if (0 > sigaction(SIGTERM, &act_dfl, 0) ||
0 > sigaction(SIGINT, &act_dfl, 0) ||
0 > sigaction(SIGUSR1, &act_dfl, 0) ||
0 > sigaction(SIGUSR2, &act_dfl, 0) ||
0 > sigaction(SIGCHLD, &act_dfl, 0) ||
0 > sigaction(SIGQUIT, &act, 0)) {
zlog(ZLOG_SYSERROR, "failed to init child signals: sigaction()");
return -1;
}
zend_signal_init();
if (0 > fpm_signals_unblock()) {
return -1;
}
return 0;
}
/* }}} */
int fpm_signals_get_fd() /* {{{ */
{
return sp[0];
}
/* }}} */
int fpm_signals_init_mask() /* {{{ */
{
/* Subset of signals from fpm_signals_init_main() and fpm_got_signal()
blocked to avoid unexpected death during early init
or during reload just after execvp() or fork */
int init_signal_array[] = { SIGUSR1, SIGUSR2, SIGCHLD };
size_t size = sizeof(init_signal_array)/sizeof(init_signal_array[0]);
size_t i = 0;
if (0 > sigemptyset(&block_sigset) ||
0 > sigemptyset(&child_block_sigset)) {
zlog(ZLOG_SYSERROR, "failed to prepare signal block mask: sigemptyset()");
return -1;
}
for (i = 0; i < size; ++i) {
int sig_i = init_signal_array[i];
if (0 > sigaddset(&block_sigset, sig_i) ||
0 > sigaddset(&child_block_sigset, sig_i)) {
if (sig_i <= NSIG && fpm_signal_names[sig_i] != NULL) {
zlog(ZLOG_SYSERROR, "failed to prepare signal block mask: sigaddset(%s)",
fpm_signal_names[sig_i]);
} else {
zlog(ZLOG_SYSERROR, "failed to prepare signal block mask: sigaddset(%d)", sig_i);
}
return -1;
}
}
if (0 > sigaddset(&child_block_sigset, SIGTERM) ||
0 > sigaddset(&child_block_sigset, SIGQUIT)) {
zlog(ZLOG_SYSERROR, "failed to prepare child signal block mask: sigaddset()");
return -1;
}
return 0;
}
/* }}} */
int fpm_signals_block() /* {{{ */
{
if (0 > sigprocmask(SIG_BLOCK, &block_sigset, NULL)) {
zlog(ZLOG_SYSERROR, "failed to block signals");
return -1;
}
return 0;
}
/* }}} */
int fpm_signals_child_block() /* {{{ */
{
if (0 > sigprocmask(SIG_BLOCK, &child_block_sigset, NULL)) {
zlog(ZLOG_SYSERROR, "failed to block child signals");
return -1;
}
return 0;
}
/* }}} */
int fpm_signals_unblock() /* {{{ */
{
/* Ensure that during reload after upgrade all signals are unblocked.
block_sigset could have different value before execve() */
sigset_t all_signals;
sigfillset(&all_signals);
if (0 > sigprocmask(SIG_UNBLOCK, &all_signals, NULL)) {
zlog(ZLOG_SYSERROR, "failed to unblock signals");
return -1;
}
return 0;
}
/* }}} */
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