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authorWaLyong Cho <walyong.cho@gmail.com>2015-07-28 02:40:50 +0900
committerWaLyong Cho <walyong.cho@samsung.com>2015-08-04 21:09:48 +0900
commit7b9c9ab810eb8746cece22de1dfec375caf4cd13 (patch)
treed7a9740b2ae42ee9e7ff3b202460a42b88796480 /src
parent13925e4ce87415d71598b81a71639b3032c0b0d3 (diff)
util: add getxattr helper apis
To get xattr of given path or fd on newly allocated buffer, add new helper api getxattr_malloc() and fgetxattr_malloc().
Diffstat (limited to 'src')
-rw-r--r--src/basic/util.c70
-rw-r--r--src/basic/util.h3
2 files changed, 73 insertions, 0 deletions
diff --git a/src/basic/util.c b/src/basic/util.c
index a968e2156d..af58dc3766 100644
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -6603,3 +6603,73 @@ int reset_uid_gid(void) {
return 0;
}
+
+int getxattr_malloc(const char *path, const char *name, char **value, bool allow_symlink) {
+ char *v;
+ size_t l;
+ ssize_t n;
+
+ assert(path);
+ assert(name);
+ assert(value);
+
+ for (l = 100; ; l = (size_t) n + 1) {
+ v = new0(char, l);
+ if (!v)
+ return -ENOMEM;
+
+ if (allow_symlink)
+ n = lgetxattr(path, name, v, l);
+ else
+ n = getxattr(path, name, v, l);
+
+ if (n >= 0 && (size_t) n < l) {
+ *value = v;
+ return n;
+ }
+
+ free(v);
+
+ if (n < 0 && errno != ERANGE)
+ return -errno;
+
+ if (allow_symlink)
+ n = lgetxattr(path, name, NULL, 0);
+ else
+ n = getxattr(path, name, NULL, 0);
+ if (n < 0)
+ return -errno;
+ }
+}
+
+int fgetxattr_malloc(int fd, const char *name, char **value) {
+ char *v;
+ size_t l;
+ ssize_t n;
+
+ assert(fd >= 0);
+ assert(name);
+ assert(value);
+
+ for (l = 100; ; l = (size_t) n + 1) {
+ v = new0(char, l);
+ if (!v)
+ return -ENOMEM;
+
+ n = fgetxattr(fd, name, v, l);
+
+ if (n >= 0 && (size_t) n < l) {
+ *value = v;
+ return n;
+ }
+
+ free(v);
+
+ if (n < 0 && errno != ERANGE)
+ return -errno;
+
+ n = fgetxattr(fd, name, NULL, 0);
+ if (n < 0)
+ return -errno;
+ }
+}
diff --git a/src/basic/util.h b/src/basic/util.h
index 88c44273d4..0a0fba9012 100644
--- a/src/basic/util.h
+++ b/src/basic/util.h
@@ -919,3 +919,6 @@ int parse_mode(const char *s, mode_t *ret);
int mount_move_root(const char *path);
int reset_uid_gid(void);
+
+int getxattr_malloc(const char *path, const char *name, char **value, bool allow_symlink);
+int fgetxattr_malloc(int fd, const char *name, char **value);