[PATCH] replace strerror() usage with threadsafe "%m" format string

[Alan Jenkins <alan-jenkins@tuffmail.co.uk>]

strerror() is not threadsafe.  It uses a buffer to build messages of the form
"Unknown error 387689".

syslog() provides a %m format which is equivalent to strerror(errno).
As a GNU extension, this is also accepted by printf and friends.
At least in the current implementation, it is correctly threadsafe.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>

diff --git a/udev/lib/libudev-ctrl.c b/udev/lib/libudev-ctrl.c
index 7d37074..268ce2d 100644
--- a/udev/lib/libudev-ctrl.c
+++ b/udev/lib/libudev-ctrl.c
@@ -79,7 +79,7 @@ struct udev_ctrl *udev_ctrl_new_from_socket(struct udev *udev, const char *socke
 
 	uctrl->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 	if (uctrl->sock < 0) {
-		err(udev, "error getting socket: %s\n", strerror(errno));
+		err(udev, "error getting socket: %m\n");
 		udev_ctrl_unref(uctrl);
 		return NULL;
 	}
@@ -101,7 +101,7 @@ int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl)
 
 	err= bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
 	if (err < 0) {
-		err(uctrl->udev, "bind failed: %s\n", strerror(errno));
+		err(uctrl->udev, "bind failed: %m\n");
 		return err;
 	}
 
@@ -158,7 +158,7 @@ static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int
 
 	err = sendto(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
 	if (err = -1) {
-		err(uctrl->udev, "error sending message: %s\n", strerror(errno));
+		err(uctrl->udev, "error sending message: %m\n");
 	}
 	return err;
 }
@@ -227,7 +227,7 @@ struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl *uctrl)
 
 	size = recvmsg(uctrl->sock, &smsg, 0);
 	if (size <  0) {
-		err(uctrl->udev, "unable to receive user udevd message: %s\n", strerror(errno));
+		err(uctrl->udev, "unable to receive user udevd message: %m\n");
 		goto err;
 	}
 	cmsg = CMSG_FIRSTHDR(&smsg);
diff --git a/udev/lib/libudev-device.c b/udev/lib/libudev-device.c
index 4d00029..4cdc957 100644
--- a/udev/lib/libudev-device.c
+++ b/udev/lib/libudev-device.c
@@ -77,7 +77,7 @@ static int device_read_db(struct udev_device *udev_device)
 	syspath_to_db_path(udev_device, filename, sizeof(filename));
 
 	if (lstat(filename, &stats) != 0) {
-		info(udev_device->udev, "no db file to read %s: %s\n", filename, strerror(errno));
+		info(udev_device->udev, "no db file to read %s: %m\n", filename);
 		return -1;
 	}
 	if ((stats.st_mode & S_IFMT) = S_IFLNK) {
@@ -88,7 +88,7 @@ static int device_read_db(struct udev_device *udev_device)
 		if (target_len > 0)
 			target[target_len] = '\0';
 		else {
-			info(udev_device->udev, "error reading db link %s: %s\n", filename, strerror(errno));
+			info(udev_device->udev, "error reading db link %s: %m\n", filename);
 			return -1;
 		}
 		if (asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), target) < 0)
@@ -99,7 +99,7 @@ static int device_read_db(struct udev_device *udev_device)
 
 	f = fopen(filename, "r");
 	if (f = NULL) {
-		info(udev_device->udev, "error reading db file %s: %s\n", filename, strerror(errno));
+		info(udev_device->udev, "error reading db file %s: %m\n", filename);
 		return -1;
 	}
 	while (fgets(line, sizeof(line), f)) {
@@ -653,7 +653,7 @@ const char *udev_device_get_attr_value(struct udev_device *udev_device, const ch
 	util_strlcat(path, attr, sizeof(path));
 
 	if (lstat(path, &statbuf) != 0) {
-		info(udev_device->udev, "stat '%s' failed: %s\n", path, strerror(errno));
+		info(udev_device->udev, "stat '%s' failed: %m\n", path);
 		goto out;
 	}
 
diff --git a/udev/lib/libudev-monitor.c b/udev/lib/libudev-monitor.c
index 8a1bdae..e72b206 100644
--- a/udev/lib/libudev-monitor.c
+++ b/udev/lib/libudev-monitor.c
@@ -83,7 +83,7 @@ struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char
 
 	udev_monitor->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 	if (udev_monitor->sock = -1) {
-		err(udev, "error getting socket: %s\n", strerror(errno));
+		err(udev, "error getting socket: %m\n");
 		free(udev_monitor);
 		return NULL;
 	}
@@ -106,7 +106,7 @@ struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev)
 
 	udev_monitor->sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
 	if (udev_monitor->sock = -1) {
-		err(udev, "error getting socket: %s\n", strerror(errno));
+		err(udev, "error getting socket: %m\n");
 		free(udev_monitor);
 		return NULL;
 	}
@@ -127,14 +127,14 @@ int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
 	if (udev_monitor->snl.nl_family != 0) {
 		err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->snl, sizeof(struct sockaddr_nl));
 		if (err < 0) {
-			err(udev_monitor->udev, "bind failed: %s\n", strerror(errno));
+			err(udev_monitor->udev, "bind failed: %m\n");
 			return err;
 		}
 		info(udev_monitor->udev, "monitor %p listening on netlink\n", udev_monitor);
 	} else if (udev_monitor->sun.sun_family != 0) {
 		err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->sun, udev_monitor->addrlen);
 		if (err < 0) {
-			err(udev_monitor->udev, "bind failed: %s\n", strerror(errno));
+			err(udev_monitor->udev, "bind failed: %m\n");
 			return err;
 		}
 		/* enable receiving of the sender credentials */
diff --git a/udev/lib/libudev.c b/udev/lib/libudev.c
index 4fd8196..12220e7 100644
--- a/udev/lib/libudev.c
+++ b/udev/lib/libudev.c
@@ -131,7 +131,7 @@ void udev_selinux_lsetfilecon(struct udev *udev, const char *file, unsigned int
 			return;
 		} 
 		if (lsetfilecon(file, scontext) < 0)
-			err(udev, "setfilecon %s failed: %s\n", file, strerror(errno));
+			err(udev, "setfilecon %s failed: %m\n", file);
 		freecon(scontext);
 	}
 #endif
@@ -150,7 +150,7 @@ void udev_selinux_setfscreatecon(struct udev *udev, const char *file, unsigned i
 			return;
 		}
 		if (setfscreatecon(scontext) < 0)
-			err(udev, "setfscreatecon %s failed: %s\n", file, strerror(errno));
+			err(udev, "setfscreatecon %s failed: %m\n", file);
 		freecon(scontext);
 	}
 #endif
@@ -163,7 +163,7 @@ void udev_selinux_resetfscreatecon(struct udev *udev)
 		selinux_init(udev);
 	if (udev->selinux_enabled) {
 		if (setfscreatecon(udev->selinux_prev_scontext) < 0)
-			err(udev, "setfscreatecon failed: %s\n", strerror(errno));
+			err(udev, "setfscreatecon failed: %m\n");
 	}
 #endif
 }
diff --git a/udev/udev_db.c b/udev/udev_db.c
index 4f3dc60..34bdef3 100644
--- a/udev/udev_db.c
+++ b/udev/udev_db.c
@@ -88,7 +88,7 @@ int udev_db_get_devices_by_name(struct udev *udev, const char *name, struct list
 
 	dir = opendir(dirname);
 	if (dir = NULL) {
-		info(udev, "no index directory '%s': %s\n", dirname, strerror(errno));
+		info(udev, "no index directory '%s': %m\n", dirname);
 		rc = -1;
 		goto out;
 	}
@@ -147,7 +147,7 @@ int udev_db_add_device(struct udevice *udevice)
 		ret = symlink(udevice->name, filename);
 		udev_selinux_resetfscreatecon(udevice->udev);
 		if (ret != 0) {
-			err(udevice->udev, "unable to create db link '%s': %s\n", filename, strerror(errno));
+			err(udevice->udev, "unable to create db link '%s': %m\n", filename);
 			return -1;
 		}
 	} else {
@@ -156,7 +156,7 @@ int udev_db_add_device(struct udevice *udevice)
 
 		f = fopen(filename, "w");
 		if (f = NULL) {
-			err(udevice->udev, "unable to create db file '%s': %s\n", filename, strerror(errno));
+			err(udevice->udev, "unable to create db file '%s': %m\n", filename);
 			return -1;
 		}
 		dbg(udevice->udev, "storing data for device '%s' in '%s'\n", udevice->dev->devpath, filename);
@@ -203,7 +203,7 @@ int udev_db_get_device(struct udevice *udevice, const char *devpath)
 	devpath_to_db_path(udevice->udev, devpath, filename, sizeof(filename));
 
 	if (lstat(filename, &stats) != 0) {
-		info(udevice->udev, "no db file to read %s: %s\n", filename, strerror(errno));
+		info(udevice->udev, "no db file to read %s: %m\n", filename);
 		return -1;
 	}
 	if ((stats.st_mode & S_IFMT) = S_IFLNK) {
@@ -215,7 +215,7 @@ int udev_db_get_device(struct udevice *udevice, const char *devpath)
 		if (target_len > 0)
 			target[target_len] = '\0';
 		else {
-			info(udevice->udev, "error reading db link %s: %s\n", filename, strerror(errno));
+			info(udevice->udev, "error reading db link %s: %m\n", filename);
 			return -1;
 		}
 		dbg(udevice->udev, "db link points to '%s'\n", target);
@@ -224,7 +224,7 @@ int udev_db_get_device(struct udevice *udevice, const char *devpath)
 	}
 
 	if (file_map(filename, &buf, &bufsize) != 0) {
-		info(udevice->udev, "error reading db file %s: %s\n", filename, strerror(errno));
+		info(udevice->udev, "error reading db file %s: %m\n", filename);
 		return -1;
 	}
 
diff --git a/udev/udev_device_event.c b/udev/udev_device_event.c
index aacd1d2..4408400 100644
--- a/udev/udev_device_event.c
+++ b/udev/udev_device_event.c
@@ -63,7 +63,7 @@ static int rename_netif(struct udevice *udevice)
 
 	sk = socket(PF_INET, SOCK_DGRAM, 0);
 	if (sk < 0) {
-		err(udevice->udev, "error opening socket: %s\n", strerror(errno));
+		err(udevice->udev, "error opening socket: %m\n");
 		return -1;
 	}
 
@@ -78,8 +78,8 @@ static int rename_netif(struct udevice *udevice)
 
 		/* see if the destination interface name already exists */
 		if (errno != EEXIST) {
-			err(udevice->udev, "error changing netif name %s to %s: %s\n",
-			    ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+			err(udevice->udev, "error changing netif name %s to %s: %m\n",
+			    ifr.ifr_name, ifr.ifr_newname);
 			goto exit;
 		}
 
@@ -88,8 +88,8 @@ static int rename_netif(struct udevice *udevice)
 		util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
 		retval = ioctl(sk, SIOCSIFNAME, &ifr);
 		if (retval != 0) {
-			err(udevice->udev, "error changing netif name %s to %s: %s\n",
-			    ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+			err(udevice->udev, "error changing netif name %s to %s: %m\n",
+			    ifr.ifr_name, ifr.ifr_newname);
 			goto exit;
 		}
 
@@ -105,8 +105,8 @@ static int rename_netif(struct udevice *udevice)
 			}
 
 			if (errno != EEXIST) {
-				err(udevice->udev, "error changing net interface name %s to %s: %s\n",
-				    ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+				err(udevice->udev, "error changing net interface name %s to %s: %m\n",
+				    ifr.ifr_name, ifr.ifr_newname);
 				break;
 			}
 			dbg(udevice->udev, "wait for netif '%s' to become free, loop=%i\n",
diff --git a/udev/udev_node.c b/udev/udev_node.c
index 8971f9f..a43e5bd 100644
--- a/udev/udev_node.c
+++ b/udev/udev_node.c
@@ -58,13 +58,13 @@ int udev_node_mknod(struct udevice *udevice, const char *file, dev_t devt, mode_
 			err = mknod(file_tmp, mode, devt);
 			udev_selinux_resetfscreatecon(udevice->udev);
 			if (err != 0) {
-				err(udevice->udev, "mknod(%s, %#o, %u, %u) failed: %s\n",
-				    file_tmp, mode, major(devt), minor(devt), strerror(errno));
+				err(udevice->udev, "mknod(%s, %#o, %u, %u) failed: %m\n",
+				    file_tmp, mode, major(devt), minor(devt));
 				goto exit;
 			}
 			err = rename(file_tmp, file);
 			if (err != 0) {
-				err(udevice->udev, "rename(%s, %s) failed: %s\n", file_tmp, file, strerror(errno));
+				err(udevice->udev, "rename(%s, %s) failed: %m\n", file_tmp, file);
 				unlink(file_tmp);
 			}
 		}
@@ -74,8 +74,8 @@ int udev_node_mknod(struct udevice *udevice, const char *file, dev_t devt, mode_
 		err = mknod(file, mode, devt);
 		udev_selinux_resetfscreatecon(udevice->udev);
 		if (err != 0) {
-			err(udevice->udev, "mknod(%s, %#o, (%u,%u) failed: %s\n",
-			    file, mode, major(devt), minor(devt), strerror(errno));
+			err(udevice->udev, "mknod(%s, %#o, (%u,%u) failed: %m\n",
+			    file, mode, major(devt), minor(devt));
 			goto exit;
 		}
 	}
@@ -84,7 +84,7 @@ int udev_node_mknod(struct udevice *udevice, const char *file, dev_t devt, mode_
 		info(udevice->udev, "chmod(%s, %#o)\n", file, mode);
 		err = chmod(file, mode);
 		if (err != 0) {
-			err(udevice->udev, "chmod(%s, %#o) failed: %s\n", file, mode, strerror(errno));
+			err(udevice->udev, "chmod(%s, %#o) failed: %m\n", file, mode);
 			goto exit;
 		}
 	}
@@ -93,7 +93,7 @@ int udev_node_mknod(struct udevice *udevice, const char *file, dev_t devt, mode_
 		info(udevice->udev, "chown(%s, %u, %u)\n", file, uid, gid);
 		err = chown(file, uid, gid);
 		if (err != 0) {
-			err(udevice->udev, "chown(%s, %u, %u) failed: %s\n", file, uid, gid, strerror(errno));
+			err(udevice->udev, "chown(%s, %u, %u) failed: %m\n", file, uid, gid);
 			goto exit;
 		}
 	}
@@ -170,12 +170,12 @@ static int node_symlink(struct udevice *udevice, const char *node, const char *s
 	retval = symlink(target, slink_tmp);
 	udev_selinux_resetfscreatecon(udevice->udev);
 	if (retval != 0) {
-		err(udevice->udev, "symlink(%s, %s) failed: %s\n", target, slink_tmp, strerror(errno));
+		err(udevice->udev, "symlink(%s, %s) failed: %m\n", target, slink_tmp);
 		goto exit;
 	}
 	retval = rename(slink_tmp, slink);
 	if (retval != 0) {
-		err(udevice->udev, "rename(%s, %s) failed: %s\n", slink_tmp, slink, strerror(errno));
+		err(udevice->udev, "rename(%s, %s) failed: %m\n", slink_tmp, slink);
 		unlink(slink_tmp);
 		goto exit;
 	}
diff --git a/udev/udev_rules.c b/udev/udev_rules.c
index 9c37571..9527f46 100644
--- a/udev/udev_rules.c
+++ b/udev/udev_rules.c
@@ -159,13 +159,13 @@ static int run_program(struct udev *udev, const char *command, const char *subsy
 	/* prepare pipes from child to parent */
 	if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
 		if (pipe(outpipe) != 0) {
-			err(udev, "pipe failed: %s\n", strerror(errno));
+			err(udev, "pipe failed: %m\n");
 			return -1;
 		}
 	}
 	if (udev_get_log_priority(udev) >= LOG_INFO) {
 		if (pipe(errpipe) != 0) {
-			err(udev, "pipe failed: %s\n", strerror(errno));
+			err(udev, "pipe failed: %m\n");
 			return -1;
 		}
 	}
@@ -196,7 +196,7 @@ static int run_program(struct udev *udev, const char *command, const char *subsy
 				dup2(devnull, STDERR_FILENO);
 			close(devnull);
 		} else
-			err(udev, "open /dev/null failed: %s\n", strerror(errno));
+			err(udev, "open /dev/null failed: %m\n");
 		if (outpipe[WRITE_END] > 0) {
 			dup2(outpipe[WRITE_END], STDOUT_FILENO);
 			close(outpipe[WRITE_END]);
@@ -215,7 +215,7 @@ static int run_program(struct udev *udev, const char *command, const char *subsy
 		}
 		_exit(1);
 	case -1:
-		err(udev, "fork of '%s' failed: %s\n", argv[0], strerror(errno));
+		err(udev, "fork of '%s' failed: %m\n", argv[0]);
 		return -1;
 	default:
 		/* read from child if requested */
@@ -258,7 +258,7 @@ static int run_program(struct udev *udev, const char *command, const char *subsy
 						close(outpipe[READ_END]);
 						outpipe[READ_END] = -1;
 						if (count < 0) {
-							err(udev, "stdin read failed: %s\n", strerror(errno));
+							err(udev, "stdin read failed: %m\n");
 							retval = -1;
 						}
 						continue;
@@ -292,7 +292,7 @@ static int run_program(struct udev *udev, const char *command, const char *subsy
 						close(errpipe[READ_END]);
 						errpipe[READ_END] = -1;
 						if (count < 0)
-							err(udev, "stderr read failed: %s\n", strerror(errno));
+							err(udev, "stderr read failed: %m\n");
 						continue;
 					}
 					errbuf[count] = '\0';
@@ -392,7 +392,7 @@ static int import_file_into_env(struct udevice *udevice, const char *filename)
 	size_t bufsize;
 
 	if (file_map(filename, &buf, &bufsize) != 0) {
-		err(udevice->udev, "can't open '%s': %s\n", filename, strerror(errno));
+		err(udevice->udev, "can't open '%s': %m\n", filename);
 		return -1;
 	}
 	import_keys_into_env(udevice, buf, bufsize);
@@ -1352,10 +1352,10 @@ try_parent:
 			if (f != NULL) {
 				if (!udevice->test_run)
 					if (fprintf(f, "%s", value) <= 0)
-						err(udevice->udev, "error writing ATTR{%s}: %s\n", attr, strerror(errno));
+						err(udevice->udev, "error writing ATTR{%s}: %m\n", attr);
 				fclose(f);
 			} else
-				err(udevice->udev, "error opening ATTR{%s} for writing: %s\n", attr, strerror(errno));
+				err(udevice->udev, "error opening ATTR{%s} for writing: %m\n", attr);
 		}
 	}
 	return 0;
diff --git a/udev/udev_rules_parse.c b/udev/udev_rules_parse.c
index 5a76889..81ba51f 100644
--- a/udev/udev_rules_parse.c
+++ b/udev/udev_rules_parse.c
@@ -692,7 +692,7 @@ static int parse_file(struct udev_rules *rules, const char *filename)
 	start = rules->bufsize;
 
 	if (file_map(filename, &buf, &bufsize) != 0) {
-		err(rules->udev, "can't open '%s' as rules file: %s\n", filename, strerror(errno));
+		err(rules->udev, "can't open '%s' as rules file: %m\n", filename);
 		return -1;
 	}
 	info(rules->udev, "reading '%s' as rules file\n", filename);
@@ -831,7 +831,7 @@ int udev_rules_init(struct udev *udev, struct udev_rules *rules, int resolve_nam
 			else
 				dbg(udev, "empty rules file '%s'\n", name_loop->name);
 		} else
-			err(udev, "could not read '%s': %s\n", name_loop->name, strerror(errno));
+			err(udev, "could not read '%s': %m\n", name_loop->name);
 		list_del(&name_loop->node);
 		free(name_loop);
 	}
diff --git a/udev/udev_sysfs.c b/udev/udev_sysfs.c
index 3e395a2..2ea724a 100644
--- a/udev/udev_sysfs.c
+++ b/udev/udev_sysfs.c
@@ -173,7 +173,7 @@ struct sysfs_device *sysfs_device_get(struct udev *udev, const char *devpath)
 	util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
 	util_strlcat(path, devpath_real, sizeof(path));
 	if (lstat(path, &statbuf) != 0) {
-		dbg(udev, "stat '%s' failed: %s\n", path, strerror(errno));
+		dbg(udev, "stat '%s' failed: %m\n", path);
 		return NULL;
 	}
 	if (S_ISLNK(statbuf.st_mode)) {
@@ -352,7 +352,7 @@ char *sysfs_attr_get_value(struct udev *udev, const char *devpath, const char *a
 	list_add(&attr->node, &attr_list);
 
 	if (lstat(path_full, &statbuf) != 0) {
-		dbg(udev, "stat '%s' failed: %s\n", path_full, strerror(errno));
+		dbg(udev, "stat '%s' failed: %m\n", path_full);
 		goto out;
 	}
 
diff --git a/udev/udev_utils.c b/udev/udev_utils.c
index 09b965e..4623c30 100644
--- a/udev/udev_utils.c
+++ b/udev/udev_utils.c
@@ -132,7 +132,7 @@ int add_matching_files(struct udev *udev, struct list_head *name_list, const cha
 	dbg(udev, "open directory '%s'\n", dirname);
 	dir = opendir(dirname);
 	if (dir = NULL) {
-		err(udev, "unable to open '%s': %s\n", dirname, strerror(errno));
+		err(udev, "unable to open '%s': %m\n", dirname);
 		return -1;
 	}
 
@@ -176,7 +176,7 @@ uid_t lookup_user(struct udev *udev, const char *user)
 		if (errno = 0 || errno = ENOENT || errno = ESRCH)
 			err(udev, "specified user '%s' unknown\n", user);
 		else
-			err(udev, "error resolving user '%s': %s\n", user, strerror(errno));
+			err(udev, "error resolving user '%s': %m\n", user);
 	} else
 		uid = pw->pw_uid;
 
@@ -194,7 +194,7 @@ extern gid_t lookup_group(struct udev *udev, const char *group)
 		if (errno = 0 || errno = ENOENT || errno = ESRCH)
 			err(udev, "specified group '%s' unknown\n", group);
 		else
-			err(udev, "error resolving group '%s': %s\n", group, strerror(errno));
+			err(udev, "error resolving group '%s': %m\n", group);
 	} else
 		gid = gr->gr_gid;
 
diff --git a/udev/udev_utils_file.c b/udev/udev_utils_file.c
index 1c7b073..84ff09e 100644
--- a/udev/udev_utils_file.c
+++ b/udev/udev_utils_file.c
@@ -91,7 +91,7 @@ int delete_path(struct udev *udev, const char *path)
 		if (retval) {
 			if (errno = ENOTEMPTY)
 				return 0;
-			err(udev, "rmdir(%s) failed: %s\n", p, strerror(errno));
+			err(udev, "rmdir(%s) failed: %m\n", p);
 			break;
 		}
 		dbg(udev, "removed '%s'\n", p);
@@ -108,18 +108,18 @@ int unlink_secure(struct udev *udev, const char *filename)
 
 	retval = chown(filename, 0, 0);
 	if (retval)
-		err(udev, "chown(%s, 0, 0) failed: %s\n", filename, strerror(errno));
+		err(udev, "chown(%s, 0, 0) failed: %m\n", filename);
 
 	retval = chmod(filename, 0000);
 	if (retval)
-		err(udev, "chmod(%s, 0000) failed: %s\n", filename, strerror(errno));
+		err(udev, "chmod(%s, 0000) failed: %m\n", filename);
 
 	retval = unlink(filename);
 	if (errno = ENOENT)
 		retval = 0;
 
 	if (retval)
-		err(udev, "unlink(%s) failed: %s\n", filename, strerror(errno));
+		err(udev, "unlink(%s) failed: %m\n", filename);
 
 	return retval;
 }
diff --git a/udev/udevadm-monitor.c b/udev/udevadm-monitor.c
index 01126c9..d5992ce 100644
--- a/udev/udevadm-monitor.c
+++ b/udev/udevadm-monitor.c
@@ -168,7 +168,7 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
 				 &readfds, NULL, NULL, NULL);
 		if (fdcount < 0) {
 			if (errno != EINTR)
-				fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
+				fprintf(stderr, "error receiving uevent message: %m\n");
 			continue;
 		}
 
diff --git a/udev/udevadm-trigger.c b/udev/udevadm-trigger.c
index e7940ef..a0f10da 100644
--- a/udev/udevadm-trigger.c
+++ b/udev/udevadm-trigger.c
@@ -105,12 +105,12 @@ static void trigger_uevent(struct udev *udev, const char *syspath, const char *a
 
 	fd = open(filename, O_WRONLY);
 	if (fd < 0) {
-		dbg(udev, "error on opening %s: %s\n", filename, strerror(errno));
+		dbg(udev, "error on opening %s: %m\n", filename);
 		return;
 	}
 
 	if (write(fd, action, strlen(action)) < 0)
-		info(udev, "error writing '%s' to '%s': %s\n", action, filename, strerror(errno));
+		info(udev, "error writing '%s' to '%s': %m\n", action, filename);
 
 	close(fd);
 }
diff --git a/udev/udevd.c b/udev/udevd.c
index e1ae7ea..1f8483c 100644
--- a/udev/udevd.c
+++ b/udev/udevd.c
@@ -264,7 +264,7 @@ static void udev_event_run(struct udevd_uevent_msg *msg)
 			exit(1);
 		exit(0);
 	case -1:
-		err(msg->udev, "fork of child failed: %s\n", strerror(errno));
+		err(msg->udev, "fork of child failed: %m\n");
 		msg_queue_delete(msg);
 		break;
 	default:
@@ -619,7 +619,7 @@ static struct udevd_uevent_msg *get_netlink_msg(struct udev *udev)
 	size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
 	if (size <  0) {
 		if (errno != EINTR)
-			err(udev, "unable to receive kernel netlink message: %s\n", strerror(errno));
+			err(udev, "unable to receive kernel netlink message: %m\n");
 		return NULL;
 	}
 
@@ -729,7 +729,7 @@ static int init_uevent_netlink_sock(struct udev *udev)
 
 	uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
 	if (uevent_netlink_sock = -1) {
-		err(udev, "error getting socket: %s\n", strerror(errno));
+		err(udev, "error getting socket: %m\n");
 		return -1;
 	}
 
@@ -738,7 +738,7 @@ static int init_uevent_netlink_sock(struct udev *udev)
 
 	retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
 	if (retval < 0) {
-		err(udev, "bind failed: %s\n", strerror(errno));
+		err(udev, "bind failed: %m\n");
 		close(uevent_netlink_sock);
 		uevent_netlink_sock = -1;
 		return -1;
@@ -876,29 +876,29 @@ int main(int argc, char *argv[])
 
 	retval = pipe(signal_pipe);
 	if (retval < 0) {
-		err(udev, "error getting pipes: %s\n", strerror(errno));
+		err(udev, "error getting pipes: %m\n");
 		goto exit;
 	}
 
 	retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
 	if (retval < 0) {
-		err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
+		err(udev, "error fcntl on read pipe: %m\n");
 		goto exit;
 	}
 	retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
 	if (retval < 0) {
-		err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
+		err(udev, "error fcntl on read pipe: %m\n");
 		goto exit;
 	}
 
 	retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
 	if (retval < 0) {
-		err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
+		err(udev, "error fcntl on write pipe: %m\n");
 		goto exit;
 	}
 	retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
 	if (retval < 0) {
-		err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
+		err(udev, "error fcntl on write pipe: %m\n");
 		goto exit;
 	}
 
@@ -917,7 +917,7 @@ int main(int argc, char *argv[])
 			dbg(udev, "daemonized fork running\n");
 			break;
 		case -1:
-			err(udev, "fork of daemon failed: %s\n", strerror(errno));
+			err(udev, "fork of daemon failed: %m\n");
 			rc = 4;
 			goto exit;
 		default:
@@ -945,7 +945,7 @@ int main(int argc, char *argv[])
 	/* OOM_DISABLE = -17 */
 	fd = open("/proc/self/oom_adj", O_RDWR);
 	if (fd < 0)
-		err(udev, "error disabling OOM: %s\n", strerror(errno));
+		err(udev, "error disabling OOM: %m\n");
 	else {
 		write(fd, "-17", 3);
 		close(fd);
@@ -992,7 +992,7 @@ int main(int argc, char *argv[])
 	} else if (errno = ENOSYS)
 		err(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n");
 	else
-		err(udev, "inotify_init failed: %s\n", strerror(errno));
+		err(udev, "inotify_init failed: %m\n");
 
 	/* maximum limit of forked childs */
 	value = getenv("UDEVD_MAX_CHILDS");
@@ -1035,7 +1035,7 @@ int main(int argc, char *argv[])
 		fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
 		if (fdcount < 0) {
 			if (errno != EINTR)
-				err(udev, "error in select: %s\n", strerror(errno));
+				err(udev, "error in select: %m\n");
 			continue;
 		}