diff options
Diffstat (limited to 'udev_sysfs.c')
| -rw-r--r-- | udev_sysfs.c | 310 |
1 files changed, 60 insertions, 250 deletions
diff --git a/udev_sysfs.c b/udev_sysfs.c index 75e275d500..71aa827d38 100644 --- a/udev_sysfs.c +++ b/udev_sysfs.c @@ -35,30 +35,6 @@ #include "logging.h" /* list of subsystem specific files, NULL if there is no file to wait for */ -static const struct subsystem_file { - const char *subsystem; - const char *file; -} subsystem_files[] = { - { .subsystem = "class", .file = NULL }, - { .subsystem = "net", .file = "ifindex" }, - { .subsystem = "scsi_host", .file = "unique_id" }, - { .subsystem = "scsi_device", .file = NULL }, - { .subsystem = "pcmcia_socket", .file = "card_type" }, - { .subsystem = "usb_host", .file = NULL }, - { .subsystem = "bluetooth", .file = "address" }, - { .subsystem = "firmware", .file = "data" }, - { .subsystem = "i2c-adapter", .file = NULL }, - { .subsystem = "pci_bus", .file = NULL }, - { .subsystem = "ieee1394", .file = NULL }, - { .subsystem = "ieee1394_host", .file = NULL }, - { .subsystem = "ieee1394_node", .file = NULL }, - { .subsystem = "fc_transport", .file = "port_id" }, - { .subsystem = "fc_host", .file = "port_id" }, - { .subsystem = "spi_transport", .file = "width" }, - { .subsystem = "spi_host", .file = "width" }, - { NULL, NULL } -}; - dev_t get_devt(struct sysfs_class_device *class_dev) { struct sysfs_attribute *attr = NULL; @@ -76,215 +52,6 @@ dev_t get_devt(struct sysfs_class_device *class_dev) return makedev(major, minor); } -int subsystem_expect_no_dev(const char *subsystem) -{ - const struct subsystem_file *file; - - for (file = subsystem_files; file->subsystem != NULL; file++) - if (strcmp(subsystem, file->subsystem) == 0) - return 1; - - return 0; -} - -/* get subsystem specific files, returns "dev" if no other found */ -static const char *get_subsystem_specific_file(const char *subsystem) -{ - const struct subsystem_file *file; - - /* look if we want to look for another file instead of "dev" */ - for (file = subsystem_files; file->subsystem != NULL; file++) - if (strcmp(subsystem, file->subsystem) == 0) - return file->file; - - return "dev"; -} - -/* wait for class pecific file to show up */ -static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev, - const char **error) -{ - const char *file; - char filename[PATH_SIZE]; - int loop; - - file = get_subsystem_specific_file(class_dev->classname); - if (file == NULL) { - dbg("class '%s' has no file to wait for", class_dev->classname); - return 0; - } - - snprintf(filename, sizeof(filename), "%s/%s", class_dev->path, file); - filename[sizeof(filename)-1] = '\0'; - dbg("looking at class '%s' for specific file '%s'", class_dev->classname, filename); - - loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; - while (--loop) { - struct stat stats; - - if (stat(class_dev->path, &stats) == -1) { - dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path); - return -ENODEV; - } - - if (stat(filename, &stats) == 0) { - dbg("class '%s' specific file '%s' found", class_dev->classname, file); - return 0; - } - - usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); - } - - dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file); - if (error) - *error = "class specific file unavailable"; - return -ENOENT; -} - -/* check if we need to wait for a physical device */ -static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev) -{ - /* list of devices without a "device" symlink to the physical device - * if device is set to NULL, no devices in that subsystem has a link */ - static const struct class_device { - const char *subsystem; - const char *device; - } class_device[] = { - { .subsystem = "block", .device = "double" }, - { .subsystem = "block", .device = "nb" }, - { .subsystem = "block", .device = "ram" }, - { .subsystem = "block", .device = "loop" }, - { .subsystem = "block", .device = "fd" }, - { .subsystem = "block", .device = "md" }, - { .subsystem = "block", .device = "dos_cd" }, - { .subsystem = "block", .device = "rflash" }, - { .subsystem = "block", .device = "rom" }, - { .subsystem = "block", .device = "rrom" }, - { .subsystem = "block", .device = "flash" }, - { .subsystem = "block", .device = "msd" }, - { .subsystem = "block", .device = "sbpcd" }, - { .subsystem = "block", .device = "pcd" }, - { .subsystem = "block", .device = "pf" }, - { .subsystem = "block", .device = "scd" }, - { .subsystem = "block", .device = "ubd" }, - { .subsystem = "block", .device = "dm-" }, - { .subsystem = "block", .device = "bcrypt" }, - { .subsystem = "input", .device = "event" }, - { .subsystem = "input", .device = "mice" }, - { .subsystem = "input", .device = "mouse" }, - { .subsystem = "input", .device = "ts" }, - { .subsystem = "input", .device = "js" }, - { .subsystem = "vc", .device = NULL }, - { .subsystem = "tty", .device = NULL }, - { .subsystem = "cpuid", .device = "cpu" }, - { .subsystem = "graphics", .device = "fb" }, - { .subsystem = "mem", .device = NULL }, - { .subsystem = "misc", .device = NULL }, - { .subsystem = "msr", .device = NULL }, - { .subsystem = "netlink", .device = NULL }, - { .subsystem = "net", .device = "sit" }, - { .subsystem = "net", .device = "lo" }, - { .subsystem = "net", .device = "tap" }, - { .subsystem = "net", .device = "ipsec" }, - { .subsystem = "net", .device = "dummy" }, - { .subsystem = "net", .device = "irda" }, - { .subsystem = "net", .device = "ppp" }, - { .subsystem = "net", .device = "tun" }, - { .subsystem = "net", .device = "pan" }, - { .subsystem = "net", .device = "bnep" }, - { .subsystem = "net", .device = "vmnet" }, - { .subsystem = "net", .device = "ippp" }, - { .subsystem = "net", .device = "nlv" }, - { .subsystem = "net", .device = "atml" }, - { .subsystem = "ppp", .device = NULL }, - { .subsystem = "sound", .device = NULL }, - { .subsystem = "printer", .device = "lp" }, - { .subsystem = "ppdev", .device = NULL }, - { .subsystem = "nvidia", .device = NULL }, - { .subsystem = "video4linux", .device = "vbi" }, - { .subsystem = "dvb", .device = NULL }, - { .subsystem = "lirc", .device = NULL }, - { .subsystem = "firmware", .device = NULL }, - { .subsystem = "drm", .device = NULL }, - { .subsystem = "pci_bus", .device = NULL }, - { .subsystem = "ieee1394", .device = NULL }, - { .subsystem = "ieee1394_host", .device = NULL }, - { .subsystem = "ieee1394_node", .device = NULL }, - { .subsystem = "raw", .device = NULL }, - { .subsystem = "zaptel", .device = NULL }, - { .subsystem = "tiglusb", .device = NULL }, - { .subsystem = "ppdev", .device = NULL }, - { .subsystem = "ticables", .device = NULL }, - { .subsystem = "snsc", .device = NULL }, - { .subsystem = "staliomem", .device = NULL }, - { .subsystem = "tape", .device = NULL }, - { .subsystem = "ip2", .device = NULL }, - { .subsystem = "tpqic02", .device = NULL }, - { .subsystem = "dsp56k", .device = NULL }, - { .subsystem = "zft", .device = NULL }, - { .subsystem = "adb", .device = NULL }, - { .subsystem = "cosa", .device = NULL }, - { .subsystem = "pg", .device = NULL }, - { .subsystem = "pt", .device = NULL }, - { .subsystem = "capi", .device = NULL }, - { NULL, NULL } - }; - const struct class_device *classdevice; - unsigned int len; - - /* the kernel may tell us what to wait for */ - if (kernel_release_satisfactory(2,6,10) > 0) - if (getenv("PHYSDEVPATH") == NULL) { - dbg("the kernel says, that there is no physical device for '%s'", class_dev->path); - return 1; - } - - for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) { - if (strcmp(class_dev->classname, classdevice->subsystem) == 0) { - /* see if no device in this class is expected to have a device-link */ - if (classdevice->device == NULL) - return 1; - - len = strlen(classdevice->device); - - /* see if device name matches */ - if (strncmp(class_dev->name, classdevice->device, len) != 0) - continue; - - /* exact name match */ - if (strlen(class_dev->name) == len) - return 1; - - /* name match with instance number */ - if (isdigit(class_dev->name[len])) - return 1; - } - } - - return 0; -} - -/* skip waiting for the bus of the devices device */ -static int class_device_expect_no_bus(struct sysfs_class_device *class_dev) -{ - static const char *devices_without_bus[] = { - "scsi_host", - "i2c-adapter", - "i2c-dev", - NULL - }; - const char **device; - - for (device = devices_without_bus; *device != NULL; device++) { - int len = strlen(*device); - - if (strncmp(class_dev->classname, *device, len) == 0) - return 1; - } - - return 0; -} - /* wait for a devices device specific file to show up */ int wait_for_devices_device(struct sysfs_device *devices_dev, const char **error) @@ -335,12 +102,10 @@ int wait_for_devices_device(struct sysfs_device *devices_dev, const struct device_file *devicefile = NULL; int loop; - /* the kernel may tell us what to wait for */ - if (kernel_release_satisfactory(2,6,10) > 0) - if (getenv("PHYSDEVBUS") == NULL) { - dbg("the kernel says, that there is no bus for '%s'", devices_dev->path); - return 0; - } + if (getenv("PHYSDEVBUS") == NULL) { + dbg("the kernel says, that there is no bus for '%s'", devices_dev->path); + return 0; + } /* wait for the bus device link to the devices device */ loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; @@ -421,19 +186,70 @@ struct sysfs_class_device *wait_class_device_open(const char *path) int wait_for_class_device(struct sysfs_class_device *class_dev, const char **error) { + const struct subsystem_file { + const char *subsystem; + const char *file; + } subsystem_files[] = { + { .subsystem = "net", .file = "ifindex" }, + { .subsystem = "scsi_host", .file = "unique_id" }, + { .subsystem = "pcmcia_socket", .file = "card_type" }, + { .subsystem = "bluetooth", .file = "address" }, + { .subsystem = "firmware", .file = "data" }, + { .subsystem = "fc_transport", .file = "port_id" }, + { .subsystem = "fc_host", .file = "port_id" }, + { .subsystem = "spi_transport", .file = "width" }, + { .subsystem = "spi_host", .file = "width" }, + { NULL, NULL } + }; + + const struct subsystem_file *subsys_file; struct sysfs_class_device *class_dev_parent; struct sysfs_device *devices_dev = NULL; + char filename[PATH_SIZE]; int loop; - if (wait_for_class_device_attributes(class_dev, error) != 0) - return -ENOENT; + /* look if we want to wait for a file */ + for (subsys_file = subsystem_files; subsys_file->subsystem != NULL; subsys_file++) + if (strcmp(class_dev->classname, subsys_file->subsystem) == 0) + break; - /* skip devices without devices-link */ - if (class_device_expect_no_device_link(class_dev)) { - dbg("no device symlink expected for '%s', ", class_dev->name); + if (subsys_file->file == NULL) { + dbg("class '%s' has no file to wait for", class_dev->classname); return 0; } + snprintf(filename, sizeof(filename), "%s/%s", class_dev->path, subsys_file->file); + filename[sizeof(filename)-1] = '\0'; + dbg("looking at class '%s' for specific file '%s'", class_dev->classname, filename); + + loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND; + while (--loop) { + struct stat stats; + + if (stat(class_dev->path, &stats) == -1) { + dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path); + return -ENODEV; + } + + if (stat(filename, &stats) == 0) { + dbg("class '%s' specific file '%s' found", class_dev->classname, subsys_file->file); + return 0; + } + + usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); + } + + dbg("error: getting class '%s' specific file '%s'", class_dev->classname, subsys_file->file); + if (error) + *error = "class specific file unavailable"; + return -1; + + /* skip devices without devices-link */ + if (getenv("PHYSDEVPATH") == NULL) { + dbg("the kernel says, that there is no physical device for '%s'", class_dev->path); + return 1; + } + /* the symlink may be on the parent device */ class_dev_parent = sysfs_get_classdev_parent(class_dev); if (class_dev_parent) @@ -461,12 +277,6 @@ int wait_for_class_device(struct sysfs_class_device *class_dev, } dbg("device symlink found pointing to '%s'", devices_dev->path); - /* wait for the devices device */ - if (class_device_expect_no_bus(class_dev)) { - dbg("no bus device expected for '%s', ", class_dev->classname); - return 0; - } - return wait_for_devices_device(devices_dev, error); } |