ipcpd, irmd: Handle signal in main thread

The signals are now handled in the main thread instead of an
asynchronous signal handler. The acceptloop is now correctly cancelled
and the associated timeouts are removed.

Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>
Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>

3 files changed, 52 insertions, 64 deletions

diff --git a/src/ipcpd/CMakeLists.txt b/src/ipcpd/CMakeLists.txt
index 3fa3bb0f..1c6f6ae9 100644
--- a/src/ipcpd/CMakeLists.txt
+++ b/src/ipcpd/CMakeLists.txt
@@ -1,5 +1,3 @@
-set(IPCP_ACCEPT_TIMEOUT 100 CACHE STRING
-  "Timeout for accept in IPCP mainloop threads (ms)")
 set(IPCP_QOS_CUBE_BE_PRIO 50 CACHE STRING
   "Priority for best effort QoS cube (0-99)")
 set(IPCP_QOS_CUBE_VIDEO_PRIO 90 CACHE STRING
diff --git a/src/ipcpd/config.h.in b/src/ipcpd/config.h.in
index f7af0808..43307d87 100644
--- a/src/ipcpd/config.h.in
+++ b/src/ipcpd/config.h.in
@@ -26,8 +26,6 @@
 #define PROG_RES_FDS        @PROG_RES_FDS@
 #define PROG_MAX_FLOWS      @PROG_MAX_FLOWS@
 
-#define IPCP_ACCEPT_TIMEOUT @IPCP_ACCEPT_TIMEOUT@
-
 #define SOCKET_TIMEOUT      @SOCKET_TIMEOUT@
 #define CONNECT_TIMEOUT     @CONNECT_TIMEOUT@
 
diff --git a/src/ipcpd/ipcp.c b/src/ipcpd/ipcp.c
index f8df5640..8640bf6e 100644
--- a/src/ipcpd/ipcp.c
+++ b/src/ipcpd/ipcp.c
@@ -71,29 +71,6 @@ struct cmd {
         int              fd;
 };
 
-static void ipcp_sig_handler(int         sig,
-                             siginfo_t * info,
-                             void *      c)
-{
-        (void) c;
-
-        switch(sig) {
-        case SIGINT:
-        case SIGTERM:
-        case SIGHUP:
-        case SIGQUIT:
-                if (info->si_pid == ipcpi.irmd_pid) {
-                        if (ipcp_get_state() == IPCP_INIT)
-                                ipcp_set_state(IPCP_NULL);
-
-                        if (ipcp_get_state() == IPCP_OPERATIONAL)
-                                ipcp_set_state(IPCP_SHUTDOWN);
-                }
-        default:
-                return;
-        }
-}
-
 uint8_t * ipcp_hash_dup(const uint8_t * hash)
 {
         uint8_t * dup = malloc(hash_len(ipcpi.dir_hash_algo));
@@ -120,28 +97,23 @@ void ipcp_hash_str(char *          buf,
         buf[2 * i] = '\0';
 }
 
+static void close_ptr(void * o)
+{
+        close(*((int *) o));
+}
+
 static void * acceptloop(void * o)
 {
         int            csockfd;
         struct timeval tv = {(SOCKET_TIMEOUT / 1000),
                              (SOCKET_TIMEOUT % 1000) * 1000};
-#if defined(__FreeBSD__) || defined(__APPLE__)
-        fd_set         fds;
-        struct timeval timeout = {(IPCP_ACCEPT_TIMEOUT / 1000),
-                                  (IPCP_ACCEPT_TIMEOUT % 1000) * 1000};
-#endif
+
         (void) o;
 
         while (ipcp_get_state() != IPCP_SHUTDOWN &&
                ipcp_get_state() != IPCP_NULL) {
                 struct cmd * cmd;
 
-#if defined(__FreeBSD__) || defined(__APPLE__)
-                FD_ZERO(&fds);
-                FD_SET(ipcpi.sockfd, &fds);
-                if (select(ipcpi.sockfd + 1, &fds, NULL, NULL, &timeout) <= 0)
-                        continue;
-#endif
                 csockfd = accept(ipcpi.sockfd, 0, 0);
                 if (csockfd < 0)
                         continue;
@@ -157,7 +129,14 @@ static void * acceptloop(void * o)
                         break;
                 }
 
+                pthread_cleanup_push(close_ptr, &csockfd);
+                pthread_cleanup_push(free, cmd);
+
                 cmd->len = read(csockfd, cmd->cbuf, SOCK_BUF_SIZE);
+
+                pthread_cleanup_pop(false);
+                pthread_cleanup_pop(false);
+
                 if (cmd->len <= 0) {
                         log_err("Failed to read from socket.");
                         close(csockfd);
@@ -179,11 +158,6 @@ static void * acceptloop(void * o)
         return (void *) 0;
 }
 
-static void close_ptr(void * o)
-{
-        close(*((int *) o));
-}
-
 static void free_msg(void * o)
 {
         ipcp_msg__free_unpacked((ipcp_msg_t *) o, NULL);
@@ -572,8 +546,6 @@ int ipcp_init(int               argc,
 {
         bool               log;
         pthread_condattr_t cattr;
-        struct timeval     tv  = {(IPCP_ACCEPT_TIMEOUT / 1000),
-                                  (IPCP_ACCEPT_TIMEOUT % 1000) * 1000};
         int                ret = -1;
 
         if (parse_args(argc, argv, &log))
@@ -594,10 +566,6 @@ int ipcp_init(int               argc,
                 goto fail_serv_sock;
         }
 
-        if (setsockopt(ipcpi.sockfd, SOL_SOCKET, SO_RCVTIMEO,
-                       (void *) &tv, sizeof(tv)))
-                log_warn("Failed to set timeout on socket.");
-
         ipcpi.ops = ops;
 
         if (pthread_mutex_init(&ipcpi.state_mtx, NULL)) {
@@ -668,7 +636,6 @@ int ipcp_init(int               argc,
 
 int ipcp_boot()
 {
-        struct sigaction sig_act;
         sigset_t  sigset;
         sigemptyset(&sigset);
         sigaddset(&sigset, SIGINT);
@@ -676,18 +643,6 @@ int ipcp_boot()
         sigaddset(&sigset, SIGHUP);
         sigaddset(&sigset, SIGPIPE);
 
-        /* init sig_act */
-        memset(&sig_act, 0, sizeof(sig_act));
-
-        /* install signal traps */
-        sig_act.sa_sigaction = &ipcp_sig_handler;
-        sig_act.sa_flags     = SA_SIGINFO;
-
-        sigaction(SIGINT,  &sig_act, NULL);
-        sigaction(SIGTERM, &sig_act, NULL);
-        sigaction(SIGHUP,  &sig_act, NULL);
-        sigaction(SIGPIPE, &sig_act, NULL);
-
         ipcpi.tpm = tpm_create(IPCP_MIN_THREADS, IPCP_ADD_THREADS,
                                mainloop, NULL);
         if (ipcpi.tpm == NULL)
@@ -706,8 +661,6 @@ int ipcp_boot()
                 goto fail_acceptor;
         }
 
-        pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);
-
         return 0;
 
  fail_acceptor:
@@ -720,6 +673,45 @@ int ipcp_boot()
 
 void ipcp_shutdown()
 {
+        siginfo_t info;
+        sigset_t  sigset;
+
+        sigemptyset(&sigset);
+        sigaddset(&sigset, SIGINT);
+        sigaddset(&sigset, SIGQUIT);
+        sigaddset(&sigset, SIGHUP);
+        sigaddset(&sigset, SIGTERM);
+        sigaddset(&sigset, SIGPIPE);
+
+        while(ipcp_get_state() != IPCP_NULL &&
+              ipcp_get_state() != IPCP_SHUTDOWN) {
+                if (sigwaitinfo(&sigset, &info) < 0) {
+                        log_warn("Bad signal.");
+                        continue;
+                }
+
+                switch(info.si_signo) {
+                case SIGINT:
+                case SIGTERM:
+                case SIGHUP:
+                case SIGQUIT:
+                        if (info.si_pid == ipcpi.irmd_pid) {
+                                if (ipcp_get_state() == IPCP_INIT)
+                                        ipcp_set_state(IPCP_NULL);
+
+                                if (ipcp_get_state() == IPCP_OPERATIONAL)
+                                        ipcp_set_state(IPCP_SHUTDOWN);
+                        }
+                        break;
+                case SIGPIPE:
+                        log_dbg("Ignored SIGPIPE.");
+                default:
+                        continue;
+                }
+        }
+
+        pthread_cancel(ipcpi.acceptor);
+
         pthread_join(ipcpi.acceptor, NULL);
         tpm_stop(ipcpi.tpm);
         tpm_destroy(ipcpi.tpm);