From 6493e655f7387a37ad6e8cb928afc1c1a5c1a454 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Sun, 26 Oct 2008 03:39:41 +0100 Subject: [PATCH] libudev: device - fill envp array while composing monitor buffer Thanks to Alan Jenkins, for the idea. --- udev/lib/libudev-device.c | 142 ++++++++++++++++++-------------------- 1 file changed, 69 insertions(+), 73 deletions(-) diff --git a/udev/lib/libudev-device.c b/udev/lib/libudev-device.c index 513c6565..b8f4b8ba 100644 --- a/udev/lib/libudev-device.c +++ b/udev/lib/libudev-device.c @@ -31,8 +31,6 @@ #include "libudev.h" #include "libudev-private.h" -#define ENVP_SIZE 128 - struct udev_device { struct udev *udev; struct udev_device *parent_device; @@ -42,11 +40,11 @@ struct udev_device { const char *sysnum; char *devnode; char *subsystem; - char **envp; char *driver; char *action; char *devpath_old; char *physdevpath; + char **envp; char *monitor_buf; size_t monitor_buf_len; struct udev_list_node devlinks_list; @@ -594,8 +592,6 @@ struct udev_device *udev_device_ref(struct udev_device *udev_device) **/ void udev_device_unref(struct udev_device *udev_device) { - unsigned int i; - if (udev_device == NULL) return; udev_device->refcount--; @@ -614,11 +610,7 @@ void udev_device_unref(struct udev_device *udev_device) free(udev_device->devpath_old); free(udev_device->physdevpath); udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list); - if (udev_device->envp != NULL) { - for (i = 0; i < ENVP_SIZE && udev_device->envp[i] != NULL; i++) - free(udev_device->envp[i]); - free(udev_device->envp); - } + free(udev_device->envp); free(udev_device->monitor_buf); info(udev_device->udev, "udev_device: %p released\n", udev_device); free(udev_device); @@ -986,7 +978,6 @@ int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value) { - udev_device->monitor_buf_len = 0; udev_device->envp_uptodate = 0; if (value == NULL) { struct udev_list_entry *list_entry; @@ -1016,83 +1007,88 @@ struct udev_list_entry *udev_device_add_property_from_string(struct udev_device return udev_device_add_property(udev_device, name, val); } -char **udev_device_get_properties_envp(struct udev_device *udev_device) +#define ENVP_SIZE 128 +#define MONITOR_BUF_SIZE 4096 +static int update_envp_monitor_buf(struct udev_device *udev_device) { - if (!udev_device->envp_uptodate) { - unsigned int i; - struct udev_list_entry *list_entry; + const char *action; + struct udev_list_entry *list_entry; + size_t bufpos; + size_t len; + unsigned int i; - if (udev_device->envp != NULL) { - for (i = 0; i < ENVP_SIZE && udev_device->envp[i] != NULL; i++) - free(udev_device->envp[i]); - } else { - udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE); - } + /* monitor buffer of property strings */ + free(udev_device->monitor_buf); + udev_device->monitor_buf_len = 0; + udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE); + if (udev_device->monitor_buf == NULL) + return -ENOMEM; - i = 0; - udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { - asprintf(&udev_device->envp[i++], "%s=%s", - udev_list_entry_get_name(list_entry), - udev_list_entry_get_value(list_entry)); - if (i+1 >= ENVP_SIZE) - break; - } - udev_device->envp[i] = NULL; - info(udev_device->udev, "constructed envp from %u properties\n", i); - udev_device->envp_uptodate = 1; - } - return udev_device->envp; -} + /* envp array, strings will point into monitor buffer */ + free(udev_device->envp); + udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE); + if (udev_device->envp == NULL) + return -ENOMEM; -#define MONITOR_BUF_SIZE 4096 -ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf) -{ - if (udev_device->monitor_buf_len == 0) { - const char *action; - struct udev_list_entry *list_entry; - size_t bufpos; - size_t len; + /* header @ */ + action = udev_device_get_action(udev_device); + if (action == NULL) + return -EINVAL; + bufpos = util_strlcpy(udev_device->monitor_buf, action, MONITOR_BUF_SIZE); + len = util_strlcpy(&udev_device->monitor_buf[bufpos], "@", MONITOR_BUF_SIZE-bufpos); + if (len >= MONITOR_BUF_SIZE-bufpos) + return -EINVAL; + bufpos += len; + len = util_strlcpy(&udev_device->monitor_buf[bufpos], + udev_device_get_devpath(udev_device), + MONITOR_BUF_SIZE-bufpos); + if (len+1 >= MONITOR_BUF_SIZE-bufpos) + return -EINVAL; + bufpos += len+1; - free(udev_device->monitor_buf); - udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE); - if (udev_device->monitor_buf == NULL) - return -ENOMEM; + i = 0; + udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { + /* add string to envp array */ + udev_device->envp[i++] = &udev_device->monitor_buf[bufpos]; + if (i+1 >= ENVP_SIZE) + return -EINVAL; - /* header @ */ - action = udev_device_get_action(udev_device); - if (action == NULL) + /* add property string to monitor buffer */ + len = util_strlcpy(&udev_device->monitor_buf[bufpos], + udev_list_entry_get_name(list_entry), MONITOR_BUF_SIZE-bufpos); + if (len >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; - bufpos = util_strlcpy(udev_device->monitor_buf, action, MONITOR_BUF_SIZE); - len = util_strlcpy(&udev_device->monitor_buf[bufpos], "@", MONITOR_BUF_SIZE-bufpos); + bufpos += len; + len = util_strlcpy(&udev_device->monitor_buf[bufpos], "=", MONITOR_BUF_SIZE-bufpos); if (len >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; bufpos += len; - len = util_strlcpy(&udev_device->monitor_buf[bufpos], - udev_device_get_devpath(udev_device), + len = util_strlcpy(&udev_device->monitor_buf[bufpos], udev_list_entry_get_value(list_entry), MONITOR_BUF_SIZE-bufpos); if (len+1 >= MONITOR_BUF_SIZE-bufpos) return -EINVAL; bufpos += len+1; - - /* property strings */ - udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { - len = util_strlcpy(&udev_device->monitor_buf[bufpos], - udev_list_entry_get_name(list_entry), MONITOR_BUF_SIZE-bufpos); - if (len >= MONITOR_BUF_SIZE-bufpos) - return -EINVAL; - bufpos += len; - len = util_strlcpy(&udev_device->monitor_buf[bufpos], "=", MONITOR_BUF_SIZE-bufpos); - if (len >= MONITOR_BUF_SIZE-bufpos) - return -EINVAL; - bufpos += len; - len = util_strlcpy(&udev_device->monitor_buf[bufpos], udev_list_entry_get_value(list_entry), - MONITOR_BUF_SIZE-bufpos); - if (len+1 >= MONITOR_BUF_SIZE-bufpos) - return -EINVAL; - bufpos += len+1; - } - udev_device->monitor_buf_len = bufpos; } + udev_device->envp[i] = NULL; + udev_device->monitor_buf_len = bufpos; + udev_device->envp_uptodate = 1; + info(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n", i, bufpos); + return 0; +} + +char **udev_device_get_properties_envp(struct udev_device *udev_device) +{ + if (!udev_device->envp_uptodate) + if (update_envp_monitor_buf(udev_device) < 32) + return NULL; + return udev_device->envp; +} + +ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf) +{ + if (!udev_device->envp_uptodate) + if (update_envp_monitor_buf(udev_device) < 32) + return -EINVAL; *buf = udev_device->monitor_buf; return udev_device->monitor_buf_len; } -- 2.39.5