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-rw-r--r--src/ipcpd/local/main.c1
-rw-r--r--src/irmd/main.c32
-rw-r--r--src/lib/CMakeLists.txt1
-rw-r--r--src/lib/lockfile.c170
-rw-r--r--src/lib/shm_ap_rbuff.c14
-rw-r--r--src/lib/shm_du_map.c10
6 files changed, 203 insertions, 25 deletions
diff --git a/src/ipcpd/local/main.c b/src/ipcpd/local/main.c
index ae75ae5e..fee7fd22 100644
--- a/src/ipcpd/local/main.c
+++ b/src/ipcpd/local/main.c
@@ -38,6 +38,7 @@
#include <ouroboros/logs.h>
+#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
diff --git a/src/irmd/main.c b/src/irmd/main.c
index 1f72fa1a..c1481a67 100644
--- a/src/irmd/main.c
+++ b/src/irmd/main.c
@@ -31,6 +31,7 @@
#include <ouroboros/list.h>
#include <ouroboros/utils.h>
#include <ouroboros/irm_config.h>
+#include <ouroboros/lockfile.h>
#include <ouroboros/shm_ap_rbuff.h>
#include <ouroboros/shm_du_map.h>
#include <ouroboros/bitmap.h>
@@ -106,6 +107,7 @@ struct irm {
pthread_rwlock_t flows_lock;
enum irm_state state;
+ struct lockfile * lf;
struct shm_du_map * dum;
pthread_t * threadpool;
int sockfd;
@@ -1331,6 +1333,9 @@ static void irm_destroy()
if (instance->dum != NULL)
shm_du_map_destroy(instance->dum);
+ if (instance->lf != NULL)
+ lockfile_destroy(instance->lf);
+
close(instance->sockfd);
pthread_rwlock_unlock(&instance->state_lock);
@@ -1698,28 +1703,28 @@ static struct irm * irm_create()
instance->state = IRMD_NULL;
- if (access("/dev/shm/" SHM_DU_MAP_FILENAME, F_OK) != -1) {
- struct shm_du_map * dum = shm_du_map_open();
-
- if (dum == NULL) {
- LOG_ERR("Could not examine existing shm file.");
+ if (access("/dev/shm/" LOCKFILE_NAME, F_OK) != -1) {
+ struct lockfile * lf = lockfile_open();
+ if (lf == NULL) {
+ LOG_ERR("Failed to open existing lockfile.");
free(instance);
return NULL;
}
- if (kill(shm_du_map_owner(dum), 0) < 0) {
+ if (kill(lockfile_owner(lf), 0) < 0) {
LOG_INFO("IRMd didn't properly shut down last time.");
- shm_du_map_destroy(dum);
- LOG_INFO("Stale shm file removed.");
+ shm_du_map_destroy(shm_du_map_open());
+ LOG_INFO("Stale resources cleaned");
+ lockfile_destroy(lf);
} else {
LOG_INFO("IRMd already running (%d), exiting.",
- shm_du_map_owner(dum));
- shm_du_map_close(dum);
+ lockfile_owner(lf));
+ lockfile_close(lf);
free(instance);
return NULL;
}
- shm_du_map_close(dum);
+ lockfile_close(lf);
}
if (pthread_rwlock_init(&instance->state_lock, NULL)) {
@@ -1777,6 +1782,11 @@ static struct irm * irm_create()
return NULL;
}
+ if ((instance->lf = lockfile_create()) == NULL) {
+ irm_destroy();
+ return NULL;
+ }
+
if ((instance->dum = shm_du_map_create()) == NULL) {
irm_destroy();
return NULL;
diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index 9c45269c..a440f7be 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -31,6 +31,7 @@ set(SOURCE_FILES
ipcp.c
irm.c
list.c
+ lockfile.c
logs.c
nsm.c
shm_ap_rbuff.c
diff --git a/src/lib/lockfile.c b/src/lib/lockfile.c
new file mode 100644
index 00000000..a93d5f17
--- /dev/null
+++ b/src/lib/lockfile.c
@@ -0,0 +1,170 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Lockfile for ouroboros system
+ *
+ * Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/config.h>
+#include <ouroboros/lockfile.h>
+
+#define OUROBOROS_PREFIX "lockfile"
+
+#include <ouroboros/logs.h>
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#define LF_SIZE (sizeof(pid_t))
+
+struct lockfile {
+ pid_t * api;
+ int fd;
+};
+
+struct lockfile * lockfile_create() {
+ struct lockfile * lf = malloc(sizeof(*lf));
+ if (lf == NULL)
+ return NULL;
+
+ lf->fd = shm_open(LOCKFILE_NAME, O_CREAT | O_EXCL | O_RDWR, 0666);
+ if (lf->fd == -1) {
+ LOG_DBGF("Could not create lock file.");
+ free(lf);
+ return NULL;
+ }
+
+ if (fchmod(lf->fd, 0666)) {
+ LOG_DBGF("Failed to chmod lockfile.");
+ free(lf);
+ return NULL;
+ }
+
+ if (lseek(lf->fd, LF_SIZE - 1, SEEK_SET) < 0) {
+ LOG_DBGF("Failed to extend lockfile.");
+ free(lf);
+ return NULL;
+ }
+
+ if (write(lf->fd, "", 1) != 1) {
+ LOG_DBGF("Failed to finalise lockfile.");
+ free(lf);
+ return NULL;
+ }
+
+ lf->api = mmap(NULL,
+ LF_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED,
+ lf->fd,
+ 0);
+
+ if (lf->api == MAP_FAILED) {
+ LOG_DBGF("Failed to map lockfile.");
+
+ if (shm_unlink(LOCKFILE_NAME) == -1)
+ LOG_DBGF("Failed to remove invalid lockfile.");
+
+ free(lf);
+ return NULL;
+ }
+
+ *lf->api = getpid();
+
+ return lf;
+}
+
+struct lockfile * lockfile_open() {
+ struct lockfile * lf = malloc(sizeof(*lf));
+ if (lf == NULL)
+ return NULL;
+
+ lf->fd = shm_open(LOCKFILE_NAME, O_RDWR, 0666);
+ if (lf->fd == -1) {
+ LOG_DBGF("Could not open lock file.");
+ free(lf);
+ return NULL;
+ }
+
+ lf->api = mmap(NULL,
+ LF_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED,
+ lf->fd,
+ 0);
+
+ if (lf->api == MAP_FAILED) {
+ LOG_DBGF("Failed to map lockfile.");
+
+ if (shm_unlink(LOCKFILE_NAME) == -1)
+ LOG_DBGF("Failed to remove invalid lockfile.");
+
+ free(lf);
+ return NULL;
+ }
+
+ return lf;
+}
+
+void lockfile_close(struct lockfile * lf)
+{
+ if (lf == NULL) {
+ LOG_DBGF("Bogus input. Bugging out.");
+ return;
+ }
+
+ if (close(lf->fd) < 0)
+ LOG_DBGF("Couldn't close lockfile.");
+
+ if (munmap(lf->api, LF_SIZE) == -1)
+ LOG_DBGF("Couldn't unmap lockfile.");
+
+ free(lf);
+}
+
+void lockfile_destroy(struct lockfile * lf)
+{
+ if (lf == NULL) {
+ LOG_DBGF("Bogus input. Bugging out.");
+ return;
+ }
+
+ if (getpid() != *lf->api && kill(*lf->api, 0) == 0) {
+ LOG_DBGF("Only IRMd can destroy %s.", LOCKFILE_NAME);
+ return;
+ }
+
+ if (close(lf->fd) < 0)
+ LOG_DBGF("Couldn't close lockfile.");
+
+ if (munmap(lf->api, LF_SIZE) == -1)
+ LOG_DBGF("Couldn't unmap lockfile.");
+
+ if (shm_unlink(LOCKFILE_NAME) == -1)
+ LOG_DBGF("Failed to remove lockfile.");
+
+ free(lf);
+}
+
+pid_t lockfile_owner(struct lockfile * lf)
+{
+ return *lf->api;
+}
diff --git a/src/lib/shm_ap_rbuff.c b/src/lib/shm_ap_rbuff.c
index 4eb91136..cf795601 100644
--- a/src/lib/shm_ap_rbuff.c
+++ b/src/lib/shm_ap_rbuff.c
@@ -26,7 +26,7 @@
#include <ouroboros/logs.h>
#include <ouroboros/shm_ap_rbuff.h>
-#include <ouroboros/shm_du_map.h>
+#include <ouroboros/lockfile.h>
#include <pthread.h>
#include <sys/mman.h>
@@ -215,7 +215,7 @@ void shm_ap_rbuff_close(struct shm_ap_rbuff * rb)
void shm_ap_rbuff_destroy(struct shm_ap_rbuff * rb)
{
char fn[25];
- struct shm_du_map * dum = NULL;
+ struct lockfile * lf = NULL;
if (rb == NULL) {
LOG_DBGF("Bogus input. Bugging out.");
@@ -223,15 +223,17 @@ void shm_ap_rbuff_destroy(struct shm_ap_rbuff * rb)
}
if (rb->api != getpid()) {
- dum = shm_du_map_open();
- if (shm_du_map_owner(dum) == getpid()) {
+ lf = lockfile_open();
+ if (lf == NULL)
+ return;
+ if (lockfile_owner(lf) == getpid()) {
LOG_DBGF("Ringbuffer %d destroyed by IRMd %d.",
rb->api, getpid());
- shm_du_map_close(dum);
+ lockfile_close(lf);
} else {
LOG_ERR("AP-I %d tried to destroy rbuff owned by %d.",
getpid(), rb->api);
- shm_du_map_close(dum);
+ lockfile_close(lf);
return;
}
}
diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c
index 53959676..01d1e23d 100644
--- a/src/lib/shm_du_map.c
+++ b/src/lib/shm_du_map.c
@@ -29,9 +29,11 @@
#include <pthread.h>
#include <sys/mman.h>
#include <fcntl.h>
+#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
+#include <errno.h>
#include <sys/stat.h>
#define OUROBOROS_PREFIX "shm_du_map"
@@ -270,14 +272,6 @@ struct shm_du_map * shm_du_map_open()
return dum;
}
-pid_t shm_du_map_owner(struct shm_du_map * dum)
-{
- if (dum == NULL)
- return -1;
-
- return *dum->api;
-}
-
void * shm_du_map_sanitize(void * o)
{
struct shm_du_map * dum = (struct shm_du_map *) o;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 01:41:42 +0000