fixed gcc warnings that call returns not checked

modified:   src/collect/collect.c
modified:   src/udev/udev-node.c
modified:   src/udev/udevadm-settle.c
modified:   src/udev/udevd.c

4 files changed, 36 insertions, 16 deletions

diff --git a/src/collect/collect.c b/src/collect/collect.c
index 7fefc62c10..b99a170420 100644
--- a/src/collect/collect.c
+++ b/src/collect/collect.c
@@ -83,6 +83,8 @@ static void usage(void)
  * prepare
  *
  * Prepares the database file
+ * returns file descriptor on success
+ * returns errno on failure
  */
 static int prepare(char *dir, char *filename)
 {
@@ -96,21 +98,22 @@ static int prepare(char *dir, char *filename)
         snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
 
         fd = open(buf,O_RDWR|O_CREAT|O_CLOEXEC, S_IRUSR|S_IWUSR);
-        if (fd < 0)
+        if (fd < 0) {
                 fprintf(stderr, "Cannot open %s: %m\n", buf);
-
+				return errno;
+		}
         if (lockf(fd,F_TLOCK,0) < 0) {
                 if (debug)
-                        fprintf(stderr, "Lock taken, wait for %d seconds\n", UDEV_ALARM_TIMEOUT);
-                if (errno == EAGAIN || errno == EACCES) {
-                        alarm(UDEV_ALARM_TIMEOUT);
-                        lockf(fd, F_LOCK, 0);
-                        if (debug)
-                                fprintf(stderr, "Acquired lock on %s\n", buf);
-                } else {
+                        fprintf(stderr, "Lock aquisition failed, retry in %d seconds\n"
+						              , UDEV_ALARM_TIMEOUT);
+                alarm(UDEV_ALARM_TIMEOUT);
+                if(lockf(fd, F_LOCK, 0)<0){
                         if (debug)
                                 fprintf(stderr, "Could not get lock on %s: %m\n", buf);
-                }
+						return errno;
+				}
+                if (debug)
+                        fprintf(stderr, "Acquired lock on %s\n", buf);
         }
 
         return fd;
@@ -476,10 +479,16 @@ int main(int argc, char **argv)
         kickout();
 
         lseek(fd, 0, SEEK_SET);
-        ftruncate(fd, 0);
+        if(ftruncate(fd, 0)!=0) {
+		        ret = errno;
+				goto out;
+		}
         ret = missing(fd);
 
-        lockf(fd, F_ULOCK, 0);
+        if(lockf(fd, F_ULOCK, 0) !=0 ) {
+		        ret = errno;
+				goto out;
+		}
         close(fd);
 out:
         if (debug)
diff --git a/src/udev/udev-node.c b/src/udev/udev-node.c
index 200e24fb41..2dddc7b4b4 100644
--- a/src/udev/udev-node.c
+++ b/src/udev/udev-node.c
@@ -286,8 +286,13 @@ static int node_permissions_apply(struct udev_device *dev, bool apply,
 
                 if ((stats.st_mode & 0777) != (mode & 0777) || stats.st_uid != uid || stats.st_gid != gid) {
                         log_debug("set permissions %s, %#o, uid=%u, gid=%u", devnode, mode, uid, gid);
-                        chmod(devnode, mode);
-                        chown(devnode, uid, gid);
+                        ;
+                        if((chmod(devnode, mode) !=0 ) || (chown(devnode, uid,gid) !=0)) {
+				                err = -errno;  
+                                log_error("FAILED to set permissions %s, %#o, uid=%u, gid=%u"
+								          ,devnode, mode, uid, gid);
+								goto out;
+						}
                 } else {
                         log_debug("preserve permissions %s, %#o, uid=%u, gid=%u", devnode, mode, uid, gid);
                 }
diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
index 9eeeab8f14..9ae6c6bf8e 100644
--- a/src/udev/udevadm-settle.c
+++ b/src/udev/udevadm-settle.c
@@ -201,7 +201,10 @@ static int adm_settle(struct udev *udev, int argc, char *argv[])
                         if (poll(pfd, 1, delay) > 0 && pfd[0].revents & POLLIN) {
                                 char buf[sizeof(struct inotify_event) + PATH_MAX];
 
-                                read(pfd[0].fd, buf, sizeof(buf));
+                                if(read(pfd[0].fd, buf, sizeof(buf)) < 0){
+								        log_error("failed to read /run/udev");
+										goto out;
+								}
                         }
                 } else {
                         sleep(1);
diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index 850e4f5ef6..03de852c02 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -1031,7 +1031,10 @@ int main(int argc, char *argv[])
         }
 
         /* set umask before creating any file/directory */
-        chdir("/");
+        if(chdir("/")!= 0) {
+                log_error("unable to change into directory '/'");
+                goto exit;
+        }
         umask(022);
 
         mkdir("/run/udev", 0755);