ulog: implement ulog_close()

[project/libubox.git] / uloop.c

diff --git a/uloop.c b/uloop.c
index 54ebe8d..9ebeca6 100644 (file)
--- a/uloop.c
+++ b/uloop.c
@@ -58,7 +58,6 @@ static struct list_head processes = LIST_HEAD_INIT(processes);
 
 static int poll_fd = -1;
 bool uloop_cancelled = false;
-bool uloop_handle_sigchld = true;
 static bool do_sigchld = false;
 
 static struct uloop_fd_event cur_fds[ULOOP_MAX_EVENTS];
@@ -174,7 +173,8 @@ static int uloop_fetch_events(int timeout)
 
                if (events[n].flags & EV_ERROR) {
                        u->error = true;
-                       uloop_fd_delete(u);
+                       if (!(u->flags & ULOOP_ERROR_CB))
+                               uloop_fd_delete(u);
                }
 
                if(events[n].filter == EVFILT_READ)
@@ -268,7 +268,8 @@ static int uloop_fetch_events(int timeout)
 
                if (events[n].events & (EPOLLERR|EPOLLHUP)) {
                        u->error = true;
-                       uloop_fd_delete(u);
+                       if (!(u->flags & ULOOP_ERROR_CB))
+                               uloop_fd_delete(u);
                }
 
                if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP))) {
@@ -383,6 +384,7 @@ int uloop_fd_add(struct uloop_fd *sock, unsigned int flags)
 
        sock->registered = true;
        sock->eof = false;
+       sock->error = false;
 
 out:
        return ret;
@@ -392,15 +394,16 @@ int uloop_fd_delete(struct uloop_fd *fd)
 {
        int i;
 
-       if (!fd->registered)
-               return 0;
-
        for (i = 0; i < cur_nfds; i++) {
                if (cur_fds[cur_fd + i].fd != fd)
                        continue;
 
                cur_fds[cur_fd + i].fd = NULL;
        }
+
+       if (!fd->registered)
+               return 0;
+
        fd->registered = false;
        uloop_fd_stack_event(fd, -1);
        return __uloop_fd_delete(fd);
@@ -450,14 +453,14 @@ int uloop_timeout_set(struct uloop_timeout *timeout, int msecs)
        if (timeout->pending)
                uloop_timeout_cancel(timeout);
 
-       uloop_gettime(&timeout->time);
+       uloop_gettime(time);
 
        time->tv_sec += msecs / 1000;
        time->tv_usec += (msecs % 1000) * 1000;
 
        if (time->tv_usec > 1000000) {
                time->tv_sec++;
-               time->tv_usec %= 1000000;
+               time->tv_usec -= 1000000;
        }
 
        return uloop_timeout_add(timeout);
@@ -555,19 +558,61 @@ static void uloop_sigchld(int signo)
        do_sigchld = true;
 }
 
-static void uloop_setup_signals(void)
+static void uloop_install_handler(int signum, void (*handler)(int), struct sigaction* old, bool add)
 {
        struct sigaction s;
+       struct sigaction *act;
 
-       memset(&s, 0, sizeof(struct sigaction));
-       s.sa_handler = uloop_handle_sigint;
-       s.sa_flags = 0;
-       sigaction(SIGINT, &s, NULL);
+       act = NULL;
+       sigaction(signum, NULL, &s);
 
-       if (uloop_handle_sigchld) {
-               s.sa_handler = uloop_sigchld;
-               sigaction(SIGCHLD, &s, NULL);
+       if (add) {
+               if (s.sa_handler == SIG_DFL) { /* Do not override existing custom signal handlers */
+                       memcpy(old, &s, sizeof(struct sigaction));
+                       s.sa_handler = handler;
+                       s.sa_flags = 0;
+                       act = &s;
+               }
        }
+       else if (s.sa_handler == handler) { /* Do not restore if someone modified our handler */
+                       act = old;
+       }
+
+       if (act != NULL)
+               sigaction(signum, act, NULL);
+}
+
+static void uloop_ignore_signal(int signum, bool ignore)
+{
+       struct sigaction s;
+       void *new_handler = NULL;
+
+       sigaction(signum, NULL, &s);
+
+       if (ignore) {
+               if (s.sa_handler == SIG_DFL) /* Ignore only if there isn't any custom handler */
+                       new_handler = SIG_IGN;
+       } else {
+               if (s.sa_handler == SIG_IGN) /* Restore only if noone modified our SIG_IGN */
+                       new_handler = SIG_DFL;
+       }
+
+       if (new_handler) {
+               s.sa_handler = new_handler;
+               s.sa_flags = 0;
+               sigaction(signum, &s, NULL);
+       }
+}
+
+static void uloop_setup_signals(bool add)
+{
+       static struct sigaction old_sigint, old_sigchld, old_sigterm;
+
+       uloop_install_handler(SIGINT, uloop_handle_sigint, &old_sigint, add);
+       uloop_install_handler(SIGTERM, uloop_handle_sigint, &old_sigterm, add);
+       uloop_install_handler(SIGCHLD, uloop_sigchld, &old_sigchld, add);
+
+       uloop_ignore_signal(SIGPIPE, add);
 }
 
 static int uloop_get_next_timeout(struct timeval *tv)
@@ -620,9 +665,17 @@ static void uloop_clear_processes(void)
 
 void uloop_run(void)
 {
+       static int recursive_calls = 0;
        struct timeval tv;
 
-       uloop_setup_signals();
+       /*
+        * Handlers are only updated for the first call to uloop_run() (and restored
+        * when this call is done).
+        */
+       if (!recursive_calls++)
+               uloop_setup_signals(true);
+
+       uloop_cancelled = false;
        while(!uloop_cancelled)
        {
                uloop_gettime(&tv);
@@ -632,8 +685,12 @@ void uloop_run(void)
 
                if (do_sigchld)
                        uloop_handle_processes();
+               uloop_gettime(&tv);
                uloop_run_events(uloop_get_next_timeout(&tv));
        }
+
+       if (!--recursive_calls)
+               uloop_setup_signals(false);
 }
 
 void uloop_done(void)