Fix: sessiond app listening: use posix-compliant poll flags

[lttng-tools.git] / src / bin / lttng-sessiond / main.c

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index a8156cf12ed87f3f33a90f3e3fef8cf818f72420..3cb970c06e21c62c50b42a2e7466ead067a493f9 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -831,8 +831,15 @@ static void *thread_manage_kernel(void *data)
                lttng_poll_reset(&events);
 
                /* Poll infinite value of time */
+       restart:
                ret = lttng_poll_wait(&events, -1);
                if (ret < 0) {
+                       /*
+                        * Restart interrupted system call.
+                        */
+                       if (errno == EINTR) {
+                               goto restart;
+                       }
                        goto error;
                } else if (ret == 0) {
                        /* Should not happen since timeout is infinite */
@@ -922,8 +929,15 @@ static void *thread_manage_consumer(void *data)
        nb_fd = LTTNG_POLL_GETNB(&events);
 
        /* Inifinite blocking call, waiting for transmission */
+restart:
        ret = lttng_poll_wait(&events, -1);
        if (ret < 0) {
+               /*
+                * Restart interrupted system call.
+                */
+               if (errno == EINTR) {
+                       goto restart;
+               }
                goto error;
        }
 
@@ -993,8 +1007,15 @@ static void *thread_manage_consumer(void *data)
        nb_fd = LTTNG_POLL_GETNB(&events);
 
        /* Inifinite blocking call, waiting for transmission */
+restart_poll:
        ret = lttng_poll_wait(&events, -1);
        if (ret < 0) {
+               /*
+                * Restart interrupted system call.
+                */
+               if (errno == EINTR) {
+                       goto restart_poll;
+               }
                goto error;
        }
 
@@ -1077,8 +1098,15 @@ static void *thread_manage_apps(void *data)
                DBG("Apps thread polling on %d fds", nb_fd);
 
                /* Inifinite blocking call, waiting for transmission */
+       restart:
                ret = lttng_poll_wait(&events, -1);
                if (ret < 0) {
+                       /*
+                        * Restart interrupted system call.
+                        */
+                       if (errno == EINTR) {
+                               goto restart;
+                       }
                        goto error;
                }
 
@@ -1138,8 +1166,10 @@ static void *thread_manage_apps(void *data)
                                                /*
                                                 * We just need here to monitor the close of the UST
                                                 * socket and poll set monitor those by default.
+                                                * Listen on POLLIN (even if we never expect any
+                                                * data) to ensure that hangup wakes us.
                                                 */
-                                               ret = lttng_poll_add(&events, ust_cmd.sock, 0);
+                                               ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
                                                if (ret < 0) {
                                                        goto error;
                                                }
@@ -1296,8 +1326,15 @@ static void *thread_registration_apps(void *data)
                nb_fd = LTTNG_POLL_GETNB(&events);
 
                /* Inifinite blocking call, waiting for transmission */
+       restart:
                ret = lttng_poll_wait(&events, -1);
                if (ret < 0) {
+                       /*
+                        * Restart interrupted system call.
+                        */
+                       if (errno == EINTR) {
+                               goto restart;
+                       }
                        goto error;
                }
 
@@ -3594,8 +3631,15 @@ static void *thread_manage_clients(void *data)
                nb_fd = LTTNG_POLL_GETNB(&events);
 
                /* Inifinite blocking call, waiting for transmission */
+       restart:
                ret = lttng_poll_wait(&events, -1);
                if (ret < 0) {
+                       /*
+                        * Restart interrupted system call.
+                        */
+                       if (errno == EINTR) {
+                               goto restart;
+                       }
                        goto error;
                }
 
@@ -3954,7 +3998,7 @@ static int set_permissions(char *rundir)
        }
 
        /* Ensure tracing group can search the run dir */
-       ret = chmod(rundir, S_IRWXU | S_IXGRP);
+       ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
        if (ret < 0) {
                ERR("Unable to set permissions on %s", rundir);
                perror("chmod");