X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udevstart.c;h=e5ce7af0307eefa214a685df3833d2ae5b104c13;hp=3ecfd4cb61d55bab55e06d8d49287a89a9699ada;hb=2c02716281adaea9cf6f57caecaf51db8dbb0917;hpb=462be028f18d94ab06c913768da78e30a1a66b68 diff --git a/udevstart.c b/udevstart.c index 3ecfd4cb6..e5ce7af03 100644 --- a/udevstart.c +++ b/udevstart.c @@ -2,10 +2,12 @@ * udevstart.c * * Copyright (C) 2004 Greg Kroah-Hartman - * + * Copyright (C) 2004 Kay Sievers + * * Quick and dirty way to populate a /dev with udev if your system - * does not have access to a shell. Based originally on a patch to udev - * from Harald Hoyer + * does not have access to a shell. Based originally on a patch + * from: + * Harald Hoyer * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -26,50 +28,53 @@ #include #include #include +#include #include #include #include +#include +#include #include +#include #include -#include -#include "logging.h" -#include "udev_lib.h" -#include "list.h" +#include "udev.h" +#include "udev_rules.h" +static const char *udev_run_str; +static const char *udev_log_str; +static struct udev_rules rules; -#ifdef LOG -unsigned char logname[LOGNAME_SIZE]; -void log_message(int level, const char *format, ...) +#ifdef USE_LOG +void log_message(int priority, const char *format, ...) { va_list args; + if (priority > udev_log_priority) + return; + va_start(args, format); - vsyslog(level, format, args); + vsyslog(priority, format, args); va_end(args); } #endif - -#define MAX_PATHLEN 1024 -#define SYSBLOCK "/sys/block" -#define SYSCLASS "/sys/class" -#define UDEV_BIN "/sbin/udev" - struct device { - struct list_head list; - char path[MAX_PATHLEN]; - char subsys[MAX_PATHLEN]; + struct list_head node; + char path[PATH_SIZE]; }; /* sort files in lexical order */ -static int device_list_insert(char *path, char *subsystem, struct list_head *device_list) +static int device_list_insert(const char *path, struct list_head *device_list) { struct device *loop_device; struct device *new_device; + const char *devpath = &path[strlen(sysfs_path)]; + + dbg("insert: '%s'\n", devpath); - list_for_each_entry(loop_device, device_list, list) { - if (strcmp(loop_device->path, path) > 0) { + list_for_each_entry(loop_device, device_list, node) { + if (strcmp(loop_device->path, devpath) > 0) { break; } } @@ -80,55 +85,117 @@ static int device_list_insert(char *path, char *subsystem, struct list_head *dev return -ENOMEM; } - strfieldcpy(new_device->path, path); - strfieldcpy(new_device->subsys, subsystem); - list_add_tail(&new_device->list, &loop_device->list); + strlcpy(new_device->path, devpath, sizeof(new_device->path)); + list_add_tail(&new_device->node, &loop_device->node); + dbg("add '%s'" , new_device->path); return 0; } -static void udev_exec(const char *path, const char* subsystem) -{ - pid_t pid; - char action[] = "ACTION=add"; - char devpath[MAX_PATHLEN]; - char nosleep[] = "UDEV_NO_SLEEP=1"; - char *env[] = { action, devpath, nosleep, NULL }; - - strcpy(devpath, "DEVPATH="); - strfieldcat(devpath, path); - - pid = fork(); - switch (pid) { - case 0: - /* child */ - execle(UDEV_BIN, "udev", subsystem, NULL, env); - dbg("exec of child failed"); - exit(1); - break; - case -1: - dbg("fork of child failed"); - break; - default: - wait(NULL); - } -} - /* list of devices that we should run last due to any one of a number of reasons */ static char *last_list[] = { "/block/dm", /* on here because dm wants to have the block devices around before it */ NULL, }; +/* list of devices that we should run first due to any one of a number of reasons */ +static char *first_list[] = { + "/class/mem", + "/class/tty", + NULL, +}; + +static int add_device(const char *devpath) +{ + struct sysfs_device *dev; + struct udevice *udev; + int retval = 0; + + /* clear and set environment for next event */ + clearenv(); + setenv("ACTION", "add", 1); + setenv("UDEV_START", "1", 1); + if (udev_log_str) + setenv("UDEV_LOG", udev_log_str, 1); + if (udev_run_str) + setenv("UDEV_RUN", udev_run_str, 1); + + dev = sysfs_device_get(devpath); + if (dev == NULL) + return -1; + + udev = udev_device_init(); + if (udev == NULL) + return -1; + + /* override built-in sysfs device */ + udev->dev = dev; + strcpy(udev->action, "add"); + udev->devt = udev_device_get_devt(udev); + + if (strcmp(udev->dev->subsystem, "net") != 0) { + udev->devt = udev_device_get_devt(udev); + if (major(udev->devt) == 0) + return -1; + } + + dbg("add '%s'", udev->dev->devpath); + setenv("DEVPATH", udev->dev->devpath, 1); + setenv("SUBSYSTEM", udev->dev->subsystem, 1); + + udev_rules_get_name(&rules, udev); + if (udev->ignore_device) { + dbg("device event will be ignored"); + goto exit; + } + if (udev->name[0] != '\0') + retval = udev_add_device(udev); + else + info("device node creation supressed"); + + if (retval == 0 && udev_run) { + struct name_entry *name_loop; + + dbg("executing run list"); + list_for_each_entry(name_loop, &udev->run_list, node) { + if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0) + pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, "add"); + else { + char program[PATH_SIZE]; + + strlcpy(program, name_loop->name, sizeof(program)); + udev_rules_apply_format(udev, program, sizeof(program)); + run_program(program, udev->dev->subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO)); + } + } + } + +exit: + udev_device_cleanup(udev); + return 0; +} + static void exec_list(struct list_head *device_list) { struct device *loop_device; struct device *tmp_device; + int i; + + /* handle the "first" type devices first */ + list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { + for (i = 0; first_list[i] != NULL; i++) { + if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) { + add_device(loop_device->path); + list_del(&loop_device->node); + free(loop_device); + break; + } + } + } /* handle the devices we are allowed to, excluding the "last" type devices */ - list_for_each_entry_safe(loop_device, tmp_device, device_list, list) { + list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { int found = 0; - int i; - for (i=0; last_list[i] != NULL; i++) { + for (i = 0; last_list[i] != NULL; i++) { if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) { found = 1; break; @@ -137,142 +204,172 @@ static void exec_list(struct list_head *device_list) if (found) continue; - udev_exec(loop_device->path, loop_device->subsys); - list_del(&loop_device->list); + add_device(loop_device->path); + list_del(&loop_device->node); free(loop_device); } /* handle the rest of the devices left over, if any */ - list_for_each_entry_safe(loop_device, tmp_device, device_list, list) { - udev_exec(loop_device->path, loop_device->subsys); - list_del(&loop_device->list); + list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { + add_device(loop_device->path); + list_del(&loop_device->node); free(loop_device); } } -static void udev_scan_block(void) +static int has_devt(const char *path) +{ + char filename[PATH_SIZE]; + struct stat statbuf; + + snprintf(filename, sizeof(filename), "%s/dev", path); + filename[sizeof(filename)-1] = '\0'; + + if (stat(filename, &statbuf) == 0) + return 1; + + return 0; +} + +static void udev_scan_block(struct list_head *device_list) { + char base[PATH_SIZE]; DIR *dir; struct dirent *dent; - LIST_HEAD(device_list); - dir = opendir(SYSBLOCK); + snprintf(base, sizeof(base), "%s/block", sysfs_path); + base[sizeof(base)-1] = '\0'; + + dir = opendir(base); if (dir != NULL) { for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { - char dirname[MAX_PATHLEN]; + char dirname[PATH_SIZE]; DIR *dir2; struct dirent *dent2; - if ((strcmp(dent->d_name, ".") == 0) || - (strcmp(dent->d_name, "..") == 0)) + if (dent->d_name[0] == '.') continue; - snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name); - dirname[MAX_PATHLEN-1] = '\0'; - device_list_insert(dirname, "block", &device_list); + snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name); + dirname[sizeof(dirname)-1] = '\0'; + if (has_devt(dirname)) + device_list_insert(dirname, device_list); + else + continue; - snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name); + /* look for partitions */ dir2 = opendir(dirname); if (dir2 != NULL) { for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { - char dirname2[MAX_PATHLEN]; - DIR *dir3; - struct dirent *dent3; + char dirname2[PATH_SIZE]; - if ((strcmp(dent2->d_name, ".") == 0) || - (strcmp(dent2->d_name, "..") == 0)) + if (dent2->d_name[0] == '.') continue; - snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name); - dirname2[MAX_PATHLEN-1] = '\0'; - - dir3 = opendir(dirname2); - if (dir3 != NULL) { - for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) { - char filename[MAX_PATHLEN]; - - if (strcmp(dent3->d_name, "dev") == 0) { - snprintf(filename, MAX_PATHLEN, "/block/%s/%s", - dent->d_name, dent2->d_name); - filename[MAX_PATHLEN-1] = '\0'; - device_list_insert(filename, "block", &device_list); - } - } - closedir(dir3); - } + snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name); + dirname2[sizeof(dirname2)-1] = '\0'; + + if (has_devt(dirname2)) + device_list_insert(dirname2, device_list); } closedir(dir2); } } closedir(dir); } - - exec_list(&device_list); } -static void udev_scan_class(void) +static void udev_scan_class(struct list_head *device_list) { + char base[PATH_SIZE]; DIR *dir; struct dirent *dent; - LIST_HEAD(device_list); - dir = opendir(SYSCLASS); + snprintf(base, sizeof(base), "%s/class", sysfs_path); + base[sizeof(base)-1] = '\0'; + + dir = opendir(base); if (dir != NULL) { for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { - char dirname[MAX_PATHLEN]; + char dirname[PATH_SIZE]; DIR *dir2; struct dirent *dent2; - if ((strcmp(dent->d_name, ".") == 0) || - (strcmp(dent->d_name, "..") == 0)) + if (dent->d_name[0] == '.') continue; - snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name); - dirname[MAX_PATHLEN-1] = '\0'; + snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name); + dirname[sizeof(dirname)-1] = '\0'; + dir2 = opendir(dirname); if (dir2 != NULL) { for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { - char dirname2[MAX_PATHLEN-1]; - DIR *dir3; - struct dirent *dent3; + char dirname2[PATH_SIZE]; - if ((strcmp(dent2->d_name, ".") == 0) || - (strcmp(dent2->d_name, "..") == 0)) + if (dent2->d_name[0] == '.') continue; - snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name); - dirname2[MAX_PATHLEN-1] = '\0'; - - dir3 = opendir(dirname2); - if (dir3 != NULL) { - for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) { - char filename[MAX_PATHLEN]; - - if (strcmp(dent3->d_name, "dev") == 0) { - snprintf(filename, MAX_PATHLEN, "/class/%s/%s", - dent->d_name, dent2->d_name); - filename[MAX_PATHLEN-1] = '\0'; - device_list_insert(filename, dent->d_name, &device_list); - } - } - closedir(dir3); - } + snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name); + dirname2[sizeof(dirname2)-1] = '\0'; + + if (has_devt(dirname2) || strcmp(dent->d_name, "net") == 0) + device_list_insert(dirname2, device_list); } closedir(dir2); } } closedir(dir); } +} - exec_list(&device_list); +static void asmlinkage sig_handler(int signum) +{ + switch (signum) { + case SIGALRM: + exit(1); + case SIGINT: + case SIGTERM: + exit(20 + signum); + } } int main(int argc, char *argv[], char *envp[]) { - init_logging("udevstart"); + LIST_HEAD(device_list); + struct sigaction act; - udev_scan_class(); - udev_scan_block(); + logging_init("udevstart"); + udev_config_init(); + dbg("version %s", UDEV_VERSION); + + udev_run_str = getenv("UDEV_RUN"); + udev_log_str = getenv("UDEV_LOG"); + + /* disable all logging if not explicitely requested */ + if (udev_log_str == NULL) + udev_log_priority = 0; + + /* set signal handlers */ + memset(&act, 0x00, sizeof(act)); + act.sa_handler = (void (*) (int))sig_handler; + sigemptyset (&act.sa_mask); + act.sa_flags = 0; + sigaction(SIGALRM, &act, NULL); + sigaction(SIGINT, &act, NULL); + sigaction(SIGTERM, &act, NULL); + + /* trigger timeout to prevent hanging processes */ + alarm(UDEV_ALARM_TIMEOUT); + + sysfs_init(); + udev_rules_init(&rules, 1); + + udev_scan_class(&device_list); + udev_scan_block(&device_list); + exec_list(&device_list); + udev_rules_cleanup(&rules); + sysfs_cleanup(); + logging_close(); return 0; }