diff options
Diffstat (limited to 'src/libudev/libudev-util.c')
| -rw-r--r-- | src/libudev/libudev-util.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/libudev/libudev-util.c b/src/libudev/libudev-util.c index 24d402cd2a..aed4393d58 100644 --- a/src/libudev/libudev-util.c +++ b/src/libudev/libudev-util.c @@ -19,7 +19,10 @@ #include <ctype.h> #include <fcntl.h> #include <time.h> +#include <pwd.h> +#include <grp.h> #include <sys/stat.h> +#include <sys/param.h> #include "libudev.h" #include "libudev-private.h" @@ -29,6 +32,164 @@ * @short_description: utils */ +int util_delete_path(struct udev *udev, const char *path) +{ + char p[UTIL_PATH_SIZE]; + char *pos; + int err = 0; + + if (path[0] == '/') + while(path[1] == '/') + path++; + util_strscpy(p, sizeof(p), path); + pos = strrchr(p, '/'); + if (pos == p || pos == NULL) + return 0; + + for (;;) { + *pos = '\0'; + pos = strrchr(p, '/'); + + /* don't remove the last one */ + if ((pos == p) || (pos == NULL)) + break; + + err = rmdir(p); + if (err < 0) { + if (errno == ENOENT) + err = 0; + break; + } + } + return err; +} + +uid_t util_lookup_user(struct udev *udev, const char *user) +{ + char *endptr; + struct passwd pwbuf; + struct passwd *pw; + uid_t uid; + size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX); + char *buf = alloca(buflen); + + if (strcmp(user, "root") == 0) + return 0; + uid = strtoul(user, &endptr, 10); + if (endptr[0] == '\0') + return uid; + + errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw); + if (pw != NULL) + return pw->pw_uid; + if (errno == 0 || errno == ENOENT || errno == ESRCH) + err(udev, "specified user '%s' unknown\n", user); + else + err(udev, "error resolving user '%s': %m\n", user); + return 0; +} + +gid_t util_lookup_group(struct udev *udev, const char *group) +{ + char *endptr; + struct group grbuf; + struct group *gr; + gid_t gid = 0; + size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX); + char *buf = NULL; + + if (strcmp(group, "root") == 0) + return 0; + gid = strtoul(group, &endptr, 10); + if (endptr[0] == '\0') + return gid; + gid = 0; + for (;;) { + char *newbuf; + + newbuf = realloc(buf, buflen); + if (!newbuf) + break; + buf = newbuf; + errno = getgrnam_r(group, &grbuf, buf, buflen, &gr); + if (gr != NULL) { + gid = gr->gr_gid; + } else if (errno == ERANGE) { + buflen *= 2; + continue; + } else if (errno == 0 || errno == ENOENT || errno == ESRCH) { + err(udev, "specified group '%s' unknown\n", group); + } else { + err(udev, "error resolving group '%s': %m\n", group); + } + break; + } + free(buf); + return gid; +} + +/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */ +int util_resolve_subsys_kernel(struct udev *udev, const char *string, + char *result, size_t maxsize, int read_value) +{ + char temp[UTIL_PATH_SIZE]; + char *subsys; + char *sysname; + struct udev_device *dev; + char *attr; + + if (string[0] != '[') + return -1; + + util_strscpy(temp, sizeof(temp), string); + + subsys = &temp[1]; + + sysname = strchr(subsys, '/'); + if (sysname == NULL) + return -1; + sysname[0] = '\0'; + sysname = &sysname[1]; + + attr = strchr(sysname, ']'); + if (attr == NULL) + return -1; + attr[0] = '\0'; + attr = &attr[1]; + if (attr[0] == '/') + attr = &attr[1]; + if (attr[0] == '\0') + attr = NULL; + + if (read_value && attr == NULL) + return -1; + + dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname); + if (dev == NULL) + return -1; + + if (read_value) { + const char *val; + + val = udev_device_get_sysattr_value(dev, attr); + if (val != NULL) + util_strscpy(result, maxsize, val); + else + result[0] = '\0'; + dbg(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result); + } else { + size_t l; + char *s; + + s = result; + l = util_strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL); + if (attr != NULL) + util_strpcpyl(&s, l, "/", attr, NULL); + dbg(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result); + } + udev_device_unref(dev); + return 0; +} ssize_t util_get_sys_core_link_value(struct udev *udev, const char *slink, const char *syspath, char *value, size_t size) { char path[UTIL_PATH_SIZE]; |