SymbX/systemd
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

stat-util: generalize is_* and verify_* handling

Browse Source
This commit is contained in:
Mike Yuan
2024-03-04 19:53:51 +00:00
committed by Luca Boccassi
parent 2492c89af0
commit 2560dcbfe6
6 changed files with 133 additions and 134 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/basic/stat-util.c
+114 -111
View File
@@ -25,43 +25,130 @@
#include "stat-util.h"
#include "string-util.h"
int is_symlink(const char *path) {
struct stat info;
static int verify_stat_at(
int fd,
const char *path,
bool follow,
int (*verify_func)(const struct stat *st),
bool verify) {
assert(path);
if (lstat(path, &info) < 0)
return -errno;
return !!S_ISLNK(info.st_mode);
}
int is_dir_full(int atfd, const char* path, bool follow) {
struct stat st;
int r;
assert(atfd >= 0 || atfd == AT_FDCWD);
assert(atfd >= 0 || path);
assert(fd >= 0 || fd == AT_FDCWD);
assert(!isempty(path) || !follow);
assert(verify_func);
if (path)
r = fstatat(atfd, path, &st, follow ? 0 : AT_SYMLINK_NOFOLLOW);
else
r = fstat(atfd, &st);
if (r < 0)
if (fstatat(fd, strempty(path), &st,
(isempty(path) ? AT_EMPTY_PATH : 0) | (follow ? 0 : AT_SYMLINK_NOFOLLOW)) < 0)
return -errno;
return !!S_ISDIR(st.st_mode);
r = verify_func(&st);
return verify ? r : r >= 0;
}
int stat_verify_regular(const struct stat *st) {
assert(st);
/* Checks whether the specified stat() structure refers to a regular file. If not returns an
* appropriate error code. */
if (S_ISDIR(st->st_mode))
return -EISDIR;
if (S_ISLNK(st->st_mode))
return -ELOOP;
if (!S_ISREG(st->st_mode))
return -EBADFD;
return 0;
}
int verify_regular_at(int fd, const char *path, bool follow) {
return verify_stat_at(fd, path, follow, stat_verify_regular, true);
}
int fd_verify_regular(int fd) {
assert(fd >= 0);
return verify_regular_at(fd, NULL, false);
}
int stat_verify_directory(const struct stat *st) {
assert(st);
if (S_ISLNK(st->st_mode))
return -ELOOP;
if (!S_ISDIR(st->st_mode))
return -ENOTDIR;
return 0;
}
int fd_verify_directory(int fd) {
assert(fd >= 0);
return verify_stat_at(fd, NULL, false, stat_verify_directory, true);
}
int is_dir_at(int fd, const char *path, bool follow) {
return verify_stat_at(fd, path, follow, stat_verify_directory, false);
}
int is_dir(const char *path, bool follow) {
assert(!isempty(path));
return is_dir_at(AT_FDCWD, path, follow);
}
int stat_verify_symlink(const struct stat *st) {
assert(st);
if (S_ISDIR(st->st_mode))
return -EISDIR;
if (!S_ISLNK(st->st_mode))
return -ENOLINK;
return 0;
}
int is_symlink(const char *path) {
assert(!isempty(path));
return verify_stat_at(AT_FDCWD, path, false, stat_verify_symlink, false);
}
int stat_verify_linked(const struct stat *st) {
assert(st);
if (st->st_nlink <= 0)
return -EIDRM; /* recognizable error. */
return 0;
}
int fd_verify_linked(int fd) {
assert(fd >= 0);
return verify_stat_at(fd, NULL, false, stat_verify_linked, true);
}
int stat_verify_device_node(const struct stat *st) {
assert(st);
if (S_ISLNK(st->st_mode))
return -ELOOP;
if (S_ISDIR(st->st_mode))
return -EISDIR;
if (!S_ISBLK(st->st_mode) && !S_ISCHR(st->st_mode))
return -ENOTTY;
return 0;
}
int is_device_node(const char *path) {
struct stat info;
assert(path);
if (lstat(path, &info) < 0)
return -errno;
return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode));
assert(!isempty(path));
return verify_stat_at(AT_FDCWD, path, false, stat_verify_device_node, false);
}
int dir_is_empty_at(int dir_fd, const char *path, bool ignore_hidden_or_backup) {
@@ -260,90 +347,6 @@ int path_is_network_fs(const char *path) {
return is_network_fs(&s);
}
int stat_verify_linked(const struct stat *st) {
assert(st);
if (st->st_nlink <= 0)
return -EIDRM; /* recognizable error. */
return 0;
}
int fd_verify_linked(int fd) {
struct stat st;
assert(fd >= 0);
if (fstat(fd, &st) < 0)
return -errno;
return stat_verify_linked(&st);
}
int stat_verify_regular(const struct stat *st) {
assert(st);
/* Checks whether the specified stat() structure refers to a regular file. If not returns an
* appropriate error code. */
if (S_ISDIR(st->st_mode))
return -EISDIR;
if (S_ISLNK(st->st_mode))
return -ELOOP;
if (!S_ISREG(st->st_mode))
return -EBADFD;
return 0;
}
int fd_verify_regular(int fd) {
struct stat st;
assert(fd >= 0);
if (fstat(fd, &st) < 0)
return -errno;
return stat_verify_regular(&st);
}
int verify_regular_at(int dir_fd, const char *path, bool follow) {
struct stat st;
assert(dir_fd >= 0 || dir_fd == AT_FDCWD);
assert(path);
if (fstatat(dir_fd, path, &st, (isempty(path) ? AT_EMPTY_PATH : 0) | (follow ? 0 : AT_SYMLINK_NOFOLLOW)) < 0)
return -errno;
return stat_verify_regular(&st);
}
int stat_verify_directory(const struct stat *st) {
assert(st);
if (S_ISLNK(st->st_mode))
return -ELOOP;
if (!S_ISDIR(st->st_mode))
return -ENOTDIR;
return 0;
}
int fd_verify_directory(int fd) {
struct stat st;
assert(fd >= 0);
if (fstat(fd, &st) < 0)
return -errno;
return stat_verify_directory(&st);
}
int proc_mounted(void) {
int r;