X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibudev%2Flibudev-device.c;h=d246d012b232d2268f426714963ba99026fda406;hb=e42e801b55740df1e2007336c8e2cb1e538849e1;hp=97cf6654eee94a0567aa3889f8008eeb6799c679;hpb=21dbe43aece5b6fc87860de175f067b56649e7d1;p=elogind.git diff --git a/src/libudev/libudev-device.c b/src/libudev/libudev-device.c index 97cf6654e..d246d012b 100644 --- a/src/libudev/libudev-device.c +++ b/src/libudev/libudev-device.c @@ -1,13 +1,21 @@ -/* - * libudev - interface to udev device information - * - * Copyright (C) 2008-2010 Kay Sievers - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - */ +/*** + This file is part of systemd. + + Copyright 2008-2012 Kay Sievers + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ #include #include @@ -67,7 +75,7 @@ struct udev_device { struct udev_list sysattr_list; struct udev_list tags_list; unsigned long long int seqnum; - unsigned long long int usec_initialized; + usec_t usec_initialized; int devlink_priority; int refcount; dev_t devnum; @@ -246,7 +254,7 @@ static int udev_device_set_devtype(struct udev_device *udev_device, const char * return 0; } -static int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem) +int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem) { free(udev_device->subsystem); udev_device->subsystem = strdup(subsystem); @@ -360,7 +368,7 @@ void udev_device_add_property_from_string_parse(struct udev_device *udev_device, if (startswith(property, "DEVPATH=")) { char path[UTIL_PATH_SIZE]; - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys", &property[8], NULL); + util_strscpyl(path, sizeof(path), "/sys", &property[8], NULL); udev_device_set_syspath(udev_device, path); } else if (startswith(property, "SUBSYSTEM=")) { udev_device_set_subsystem(udev_device, &property[10]); @@ -378,12 +386,12 @@ void udev_device_add_property_from_string_parse(struct udev_device *udev_device, next = strchr(slink, ' '); while (next != NULL) { next[0] = '\0'; - udev_device_add_devlink(udev_device, slink, 0); + udev_device_add_devlink(udev_device, slink); slink = &next[1]; next = strchr(slink, ' '); } if (slink[0] != '\0') - udev_device_add_devlink(udev_device, slink, 0); + udev_device_add_devlink(udev_device, slink); } else if (startswith(property, "TAGS=")) { char tags[UTIL_PATH_SIZE]; char *next; @@ -479,13 +487,13 @@ int udev_device_read_db(struct udev_device *udev_device, const char *dbfile) id = udev_device_get_id_filename(udev_device); if (id == NULL) return -1; - util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/run/udev/data/", id, NULL); + util_strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); dbfile = filename; } f = fopen(dbfile, "re"); if (f == NULL) { - dbg(udev_device->udev, "no db file to read %s: %m\n", dbfile); + udev_dbg(udev_device->udev, "no db file to read %s: %m\n", dbfile); return -1; } udev_device->is_initialized = true; @@ -502,8 +510,8 @@ int udev_device_read_db(struct udev_device *udev_device, const char *dbfile) val = &line[2]; switch(line[0]) { case 'S': - util_strscpyl(filename, sizeof(filename), TEST_PREFIX "/dev/", val, NULL); - udev_device_add_devlink(udev_device, filename, 0); + util_strscpyl(filename, sizeof(filename), "/dev/", val, NULL); + udev_device_add_devlink(udev_device, filename); break; case 'L': udev_device_set_devlink_priority(udev_device, atoi(val)); @@ -525,7 +533,7 @@ int udev_device_read_db(struct udev_device *udev_device, const char *dbfile) } fclose(f); - dbg(udev_device->udev, "device %p filled with db file data\n", udev_device); + udev_dbg(udev_device->udev, "device %p filled with db file data\n", udev_device); return 0; } @@ -642,13 +650,13 @@ _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, con return NULL; /* path starts in sys */ - if (!startswith(syspath, TEST_PREFIX "/sys")) { - dbg(udev, "not in sys :%s\n", syspath); + if (!startswith(syspath, "/sys")) { + udev_dbg(udev, "not in sys :%s\n", syspath); return NULL; } /* path is not a root directory */ - subdir = syspath + strlen(TEST_PREFIX "/sys"); + subdir = syspath + strlen("/sys"); pos = strrchr(subdir, '/'); if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) return NULL; @@ -657,7 +665,7 @@ _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, con util_strscpy(path, sizeof(path), syspath); util_resolve_sys_link(udev, path, sizeof(path)); - if (startswith(path + strlen(TEST_PREFIX "/sys"), "/devices/")) { + if (startswith(path + strlen("/sys"), "/devices/")) { char file[UTIL_PATH_SIZE]; /* all "devices" require a "uevent" file */ @@ -675,7 +683,7 @@ _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, con return NULL; udev_device_set_syspath(udev_device, path); - dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device)); + udev_dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device)); return udev_device; } @@ -709,12 +717,30 @@ _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char return NULL; /* use /sys/dev/{block,char}/: link */ - snprintf(path, sizeof(path), TEST_PREFIX "/sys/dev/%s/%u:%u", + snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u", type_str, major(devnum), minor(devnum)); return udev_device_new_from_syspath(udev, path); } -struct udev_device *udev_device_new_from_id_filename(struct udev *udev, char *id) +/** + * udev_device_new_from_device_id: + * @udev: udev library context + * @id: text string identifying a kernel device + * + * Create new udev device, and fill in information from the sys + * device and the udev database entry. The device is looked-up + * by a special string: + * b8:2 - block device major:minor + * c128:1 - char device major:minor + * n3 - network device ifindex + * +sound:card29 - kernel driver core subsystem:device name + * + * The initial refcount is 1, and needs to be decremented to + * release the resources of the udev device. + * + * Returns: a new udev device, or #NULL, if it does not exist + **/ +_public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, char *id) { char type; int maj, min; @@ -790,22 +816,22 @@ _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev struct stat statbuf; if (streq(subsystem, "subsystem")) { - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/subsystem/", sysname, NULL); + util_strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL); if (stat(path, &statbuf) == 0) goto found; - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/bus/", sysname, NULL); + util_strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL); if (stat(path, &statbuf) == 0) goto found; - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/class/", sysname, NULL); + util_strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL); if (stat(path, &statbuf) == 0) goto found; goto out; } if (streq(subsystem, "module")) { - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/module/", sysname, NULL); + util_strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL); if (stat(path, &statbuf) == 0) goto found; goto out; @@ -821,26 +847,26 @@ _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev driver[0] = '\0'; driver = &driver[1]; - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/subsystem/", subsys, "/drivers/", driver, NULL); + util_strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL); if (stat(path, &statbuf) == 0) goto found; - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/bus/", subsys, "/drivers/", driver, NULL); + util_strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL); if (stat(path, &statbuf) == 0) goto found; } goto out; } - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/subsystem/", subsystem, "/devices/", sysname, NULL); + util_strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL); if (stat(path, &statbuf) == 0) goto found; - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/bus/", subsystem, "/devices/", sysname, NULL); + util_strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL); if (stat(path, &statbuf) == 0) goto found; - util_strscpyl(path, sizeof(path), TEST_PREFIX "/sys/class/", subsystem, "/", sysname, NULL); + util_strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL); if (stat(path, &statbuf) == 0) goto found; out: @@ -877,7 +903,7 @@ _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev) udev_device_add_property_from_string_parse(udev_device, environ[i]); if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) { - dbg(udev, "missing values, invalid device\n"); + udev_dbg(udev, "missing values, invalid device\n"); udev_device_unref(udev_device); udev_device = NULL; } @@ -892,7 +918,7 @@ static struct udev_device *device_new_from_parent(struct udev_device *udev_devic const char *subdir; util_strscpy(path, sizeof(path), udev_device->syspath); - subdir = path + strlen(TEST_PREFIX "/sys/"); + subdir = path + strlen("/sys/"); for (;;) { char *pos; @@ -1022,14 +1048,15 @@ _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device) * Drop a reference of a udev device. If the refcount reaches zero, * the resources of the device will be released. * + * Returns: the passed udev device if it has still an active reference, or #NULL otherwise. **/ -_public_ void udev_device_unref(struct udev_device *udev_device) +_public_ struct udev_device *udev_device_unref(struct udev_device *udev_device) { if (udev_device == NULL) - return; + return NULL; udev_device->refcount--; if (udev_device->refcount > 0) - return; + return udev_device; if (udev_device->parent_device != NULL) udev_device_unref(udev_device->parent_device); free(udev_device->syspath); @@ -1049,6 +1076,7 @@ _public_ void udev_device_unref(struct udev_device *udev_device) free(udev_device->envp); free(udev_device->monitor_buf); free(udev_device); + return NULL; } /** @@ -1104,7 +1132,7 @@ _public_ const char *udev_device_get_sysname(struct udev_device *udev_device) * * Get the instance number of the device. * - * Returns: the trailing number string of of the device name + * Returns: the trailing number string of the device name **/ _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device) { @@ -1247,7 +1275,7 @@ _public_ const char *udev_device_get_action(struct udev_device *udev_device) **/ _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device) { - unsigned long long now_ts; + usec_t now_ts; if (udev_device == NULL) return 0; @@ -1255,23 +1283,23 @@ _public_ unsigned long long int udev_device_get_usec_since_initialized(struct ud udev_device_read_db(udev_device, NULL); if (udev_device->usec_initialized == 0) return 0; - now_ts = now_usec(); + now_ts = now(CLOCK_MONOTONIC); if (now_ts == 0) return 0; return now_ts - udev_device->usec_initialized; } -unsigned long long udev_device_get_usec_initialized(struct udev_device *udev_device) +usec_t udev_device_get_usec_initialized(struct udev_device *udev_device) { return udev_device->usec_initialized; } -void udev_device_set_usec_initialized(struct udev_device *udev_device, unsigned long long usec_initialized) +void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized) { char num[32]; udev_device->usec_initialized = usec_initialized; - snprintf(num, sizeof(num), "%llu", usec_initialized); + snprintf(num, sizeof(num), "%llu", (unsigned long long)usec_initialized); udev_device_add_property(udev_device, "USEC_INITIALIZED", num); } @@ -1330,16 +1358,17 @@ _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_devi goto out; } - /* resolve link to a device and return its syspath */ - util_strscpyl(path, sizeof(path), udev_device->syspath, "/", sysattr, NULL); - dev = udev_device_new_from_syspath(udev_device->udev, path); - if (dev != NULL) { - list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, - udev_device_get_syspath(dev)); - val = udev_list_entry_get_value(list_entry); - udev_device_unref(dev); + /* resolve custom link to a device and return its syspath */ + if (!streq(sysattr, "device")) { + util_strscpyl(path, sizeof(path), udev_device->syspath, "/", sysattr, NULL); + dev = udev_device_new_from_syspath(udev_device->udev, path); + if (dev != NULL) { + list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, + udev_device_get_syspath(dev)); + val = udev_list_entry_get_value(list_entry); + udev_device_unref(dev); + } } - goto out; } @@ -1441,7 +1470,7 @@ int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath udev_device->syspath = strdup(syspath); if (udev_device->syspath == NULL) return -ENOMEM; - udev_device->devpath = udev_device->syspath + strlen(TEST_PREFIX "/sys"); + udev_device->devpath = udev_device->syspath + strlen("/sys"); udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath); pos = strrchr(udev_device->syspath, '/'); @@ -1474,7 +1503,7 @@ int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode { free(udev_device->devnode); if (devnode[0] != '/') { - if (asprintf(&udev_device->devnode, TEST_PREFIX "/dev/%s", devnode) < 0) + if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0) udev_device->devnode = NULL; } else { udev_device->devnode = strdup(devnode); @@ -1485,7 +1514,7 @@ int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode return 0; } -int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink, int unique) +int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink) { struct udev_list_entry *list_entry; @@ -1493,8 +1522,6 @@ int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL); if (list_entry == NULL) return -ENOMEM; - if (unique) - udev_list_entry_set_num(list_entry, true); return 0; }