X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=namedev.c;h=268a3d5be667b0a4cbcbaf34817e24ca2521e8f8;hp=51a4639abe667a71fcfd2d92ea18f19b8c4df26c;hb=af4b05d4917fdfa55eff3d8d53a830464d8162a1;hpb=1e799babb6f37b2d52f1a0a3bfaf85c0405cf10a diff --git a/namedev.c b/namedev.c index 51a4639ab..268a3d5be 100644 --- a/namedev.c +++ b/namedev.c @@ -29,12 +29,9 @@ #include #include #include -#include #include #include -#ifndef __KLIBC__ #include -#endif #include "libsysfs/sysfs/libsysfs.h" #include "list.h" @@ -43,7 +40,7 @@ #include "udev_version.h" #include "logging.h" #include "namedev.h" -#include "klibc_fixups.h" +#include "udevdb.h" static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr); @@ -181,6 +178,37 @@ static int get_format_len(char **str) return -1; } +/** Finds the lowest positive N such that N isn't present in + * $(udevroot) either as a file or a symlink. + * + * @param name Name to check for + * @return 0 if didn't exist and N otherwise. + */ +static int find_free_number(struct udevice *udev, const char *name) +{ + char filename[NAME_SIZE]; + int num = 0; + struct udevice db_udev; + + strfieldcpy(filename, name); + while (1) { + dbg("look for existing node '%s'", filename); + memset(&db_udev, 0x00, sizeof(struct udevice)); + if (udevdb_get_dev_byname(&db_udev, filename) != 0) { + dbg("free num=%d", num); + return num; + } + + num++; + if (num > 1000) { + info("find_free_number gone crazy (num=%d), aborted", num); + return -1; + } + snprintf(filename, NAME_SIZE-1, "%s%d", name, num); + filename[NAME_SIZE-1] = '\0'; + } +} + static void apply_format(struct udevice *udev, char *string, size_t maxsize, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device) @@ -197,25 +225,24 @@ static void apply_format(struct udevice *udev, char *string, size_t maxsize, char *rest; int slen; struct sysfs_attribute *tmpattr; + unsigned int next_free_number; pos = string; - while (1) { - pos = strchr(string, '%'); - if (pos != NULL) { - pos[0] = '\0'; - tail = pos+1; - len = get_format_len(&tail); - c = tail[0]; - strfieldcpy(temp, tail+1); - tail = temp; - } else { + pos = strchr(pos, '%'); + if (pos == NULL) break; - } - dbg("format=%c, string='%s', tail='%s'",c , string, tail); + pos[0] = '\0'; + tail = pos+1; + len = get_format_len(&tail); + c = tail[0]; + strfieldcpy(temp, tail+1); + tail = temp; + dbg("format=%c, string='%s', tail='%s'",c , string, tail); attr = get_format_attribute(&tail); + switch (c) { case 'b': if (strlen(udev->bus_id) == 0) @@ -278,6 +305,17 @@ static void apply_format(struct udevice *udev, char *string, size_t maxsize, dbg("sysfa attribute '%s' not found", attr); break; } + /* strip trailing whitespace of matching value */ + if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) { + i = len = strlen(tmpattr->value); + while (i > 0 && isspace(tmpattr->value[i-1])) + i--; + if (i < len) { + tmpattr->value[i] = '\0'; + dbg("remove %i trailing whitespace chars from '%s'", + len - i, tmpattr->value); + } + } strfieldcatmax(string, tmpattr->value, maxsize); dbg("substitute sysfs value '%s'", tmpattr->value); } else { @@ -286,6 +324,14 @@ static void apply_format(struct udevice *udev, char *string, size_t maxsize, break; case '%': strfieldcatmax(string, "%", maxsize); + pos++; + break; + case 'e': + next_free_number = find_free_number(udev, string); + if (next_free_number > 0) { + sprintf(temp2, "%d", next_free_number); + strfieldcatmax(string, temp2, maxsize); + } break; default: dbg("unknown substitution type '%%%c'", c); @@ -299,69 +345,6 @@ static void apply_format(struct udevice *udev, char *string, size_t maxsize, } } -/* - * Note, we can have multiple files for different busses in here due - * to the mess that USB has for its device tree... - */ -static struct bus_file { - char *bus; - char *file; -} bus_files[] = { - { .bus = "scsi", .file = "vendor" }, - { .bus = "usb", .file = "idVendor" }, - { .bus = "usb", .file = "iInterface" }, - { .bus = "usb-serial", .file = "detach_state" }, - { .bus = "ide", .file = "detach_state" }, - { .bus = "pci", .file = "vendor" }, - {} -}; - -#define SECONDS_TO_WAIT_FOR_FILE 10 -static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device) -{ - /* sleep until we see the file for this specific bus type show up this - * is needed because we can easily out-run the kernel in looking for - * these files before the paticular subsystem has created them in the - * sysfs tree properly. - * - * And people thought that the /sbin/hotplug event system was going to - * be slow, poo on you for arguing that before even testing it... - */ - struct bus_file *b = &bus_files[0]; - struct sysfs_attribute *tmpattr; - int found = 0; - int loop = SECONDS_TO_WAIT_FOR_FILE; - - while (1) { - if (b->bus == NULL) { - if (!found) - break; - /* sleep to give the kernel a chance to create the file */ - sleep(1); - --loop; - if (loop == 0) - break; - b = &bus_files[0]; - } - if (strcmp(sysfs_device->bus, b->bus) == 0) { - found = 1; - dbg("looking for file '%s' on bus '%s'", b->file, b->bus); - tmpattr = sysfs_get_device_attr(sysfs_device, b->file); - if (tmpattr) { - /* found it! */ - goto exit; - } - dbg("can't find '%s' file", b->file); - } - ++b; - } - if (!found) - dbg("did not find bus type '%s' on list of bus_id_files, " - "contact greg@kroah.com", sysfs_device->bus); -exit: - return; /* here to prevent compiler warning... */ -} - static void fix_kernel_name(struct udevice *udev) { char *temp = udev->kernel_name; @@ -375,7 +358,7 @@ static void fix_kernel_name(struct udevice *udev) } } -static int execute_program(char *path, char *value, int len) +static int execute_program(struct udevice *udev, const char *path, char *value, int len) { int retval; int count; @@ -384,28 +367,34 @@ static int execute_program(char *path, char *value, int len) pid_t pid; char *pos; char arg[PROGRAM_SIZE]; - char *argv[sizeof(arg) / 2]; + char *argv[(PROGRAM_SIZE / 2) + 1]; int i; + strfieldcpy(arg, path); i = 0; if (strchr(path, ' ')) { - strfieldcpy(arg, path); pos = arg; while (pos != NULL) { if (pos[0] == '\'') { /* don't separate if in apostrophes */ pos++; argv[i] = strsep(&pos, "\'"); - while (pos[0] == ' ') + while (pos && pos[0] == ' ') pos++; - } else { + } else { argv[i] = strsep(&pos, " "); } dbg("arg[%i] '%s'", i, argv[i]); i++; } + argv[i] = NULL; + dbg("execute '%s' with parsed arguments", arg); + } else { + argv[0] = arg; + argv[1] = udev->subsystem; + argv[2] = NULL; + dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]); } - argv[i] = NULL; retval = pipe(fds); if (retval != 0) { @@ -417,17 +406,9 @@ static int execute_program(char *path, char *value, int len) switch(pid) { case 0: /* child */ - close(STDOUT_FILENO); - - /* dup write side of pipe to STDOUT */ - dup(fds[1]); - if (argv[0] != NULL) { - dbg("execute '%s' with given arguments", argv[0]); - retval = execv(argv[0], argv); - } else { - dbg("execute '%s' with main argument", path); - retval = execv(path, main_argv); - } + /* dup2 write side of pipe to STDOUT */ + dup2(fds[1], STDOUT_FILENO); + retval = execv(arg, argv); info(FIELD_PROGRAM " execution of '%s' failed", path); exit(1); @@ -463,7 +444,7 @@ static int execute_program(char *path, char *value, int len) dbg("result is '%s'", value); close(fds[0]); - wait(&status); + waitpid(pid, &status, 0); if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) { dbg("exec program status 0x%x", status); @@ -605,72 +586,6 @@ static int match_place(struct config_device *dev, struct sysfs_class_device *cla return 0; } -static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev) -{ - struct sysfs_device *sysfs_device; - struct sysfs_class_device *class_dev_parent; - struct timespec tspec; - int loop; - - /* Figure out where the device symlink is at. For char devices this will - * always be in the class_dev->path. But for block devices, it's different. - * The main block device will have the device symlink in it's path, but - * all partitions have the symlink in its parent directory. - * But we need to watch out for block devices that do not have parents, yet - * look like a partition (fd0, loop0, etc.) They all do not have a device - * symlink yet. We do sit and spin on waiting for them right now, we should - * possibly have a whitelist for these devices here... - */ - class_dev_parent = sysfs_get_classdev_parent(class_dev); - if (class_dev_parent != NULL) - dbg("given class device has a parent, use this instead"); - - tspec.tv_sec = 0; - tspec.tv_nsec = 10000000; /* sleep 10 millisec */ - loop = 10; - while (loop--) { - if (udev_sleep) - nanosleep(&tspec, NULL); - - if (class_dev_parent) - sysfs_device = sysfs_get_classdev_device(class_dev_parent); - else - sysfs_device = sysfs_get_classdev_device(class_dev); - if (sysfs_device != NULL) - goto device_found; - } - dbg("timed out waiting for device symlink, continuing on anyway..."); - -device_found: - /* We have another issue with just the wait above - the sysfs part of - * the kernel may not be quick enough to have created the link to the - * device under the "bus" subsystem. Due to this, the sysfs_device->bus - * will not contain the actual bus name :( - */ - if (sysfs_device) { - if (sysfs_device->bus[0] != '\0') - goto bus_found; - - loop = 10; - tspec.tv_nsec = 10000000; - while (loop--) { - if (udev_sleep) - nanosleep(&tspec, NULL); - sysfs_get_device_bus(sysfs_device); - - if (sysfs_device->bus[0] != '\0') - goto bus_found; - } - dbg("timed out waiting to find the device bus, continuing on anyway"); - goto exit; -bus_found: - dbg("device %s is registered with bus '%s'", - sysfs_device->name, sysfs_device->bus); - } -exit: - return sysfs_device; -} - static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device) { while (1) { @@ -735,10 +650,12 @@ static int match_rule(struct config_device *dev, struct sysfs_class_device *clas /* execute external program */ if (dev->program[0] != '\0') { + char program[PROGRAM_SIZE]; + dbg("check " FIELD_PROGRAM); - apply_format(udev, dev->program, sizeof(dev->program), - class_dev, sysfs_device); - if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) { + strfieldcpy(program, dev->program); + apply_format(udev, program, sizeof(program), class_dev, sysfs_device); + if (execute_program(udev, program, udev->program_result, NAME_SIZE) != 0) { dbg(FIELD_PROGRAM " returned nonzero"); goto try_parent; } else { @@ -774,8 +691,9 @@ try_parent: } -int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev) +int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev) { + struct sysfs_class_device *class_dev_parent; struct sysfs_device *sysfs_device = NULL; struct config_device *dev; struct perm_device *perm; @@ -783,17 +701,27 @@ int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *ud char *pos; udev->mode = 0; + dbg("class_dev->name='%s'", class_dev->name); + + /* Figure out where the "device"-symlink is at. For char devices this will + * always be in the class_dev->path. On block devices, only the main block + * device will have the device symlink in it's path. All partition devices + * need to look at the symlink in its parent directory. + */ + class_dev_parent = sysfs_get_classdev_parent(class_dev); + if (class_dev_parent != NULL) { + dbg("given class device has a parent, use this instead"); + sysfs_device = sysfs_get_classdev_device(class_dev_parent); + } else { + sysfs_device = sysfs_get_classdev_device(class_dev); + } - /* find the sysfs_device associated with this class device */ - sysfs_device = get_sysfs_device(class_dev); if (sysfs_device) { - dbg("sysfs_device->path='%s'", sysfs_device->path); - dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id); - dbg("sysfs_device->bus='%s'", sysfs_device->bus); + dbg("found devices device: path='%s', bus_id='%s', bus='%s'", + sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus); strfieldcpy(udev->bus_id, sysfs_device->bus_id); - wait_for_device_to_initialize(sysfs_device); + strfieldcpy(udev->bus, sysfs_device->bus); } - dbg("class_dev->name = '%s'", class_dev->name); strfieldcpy(udev->kernel_name, class_dev->name); fix_kernel_name(udev); @@ -870,11 +798,10 @@ perms: set_empty_perms(udev, perm->mode, perm->owner, perm->group); - } else { - set_empty_perms(udev, get_default_mode(), - get_default_owner(), - get_default_group()); } + set_empty_perms(udev, get_default_mode(), + get_default_owner(), + get_default_group()); dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o", udev->name, udev->owner, udev->group, udev->mode);