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fs: Support O_NOFOLLOW flag

Browse Source 
https://pubs.opengroup.org/onlinepubs/9699919799.2013edition/functions/open.html:
O_NOFOLLOW
If path names a symbolic link, fail and set errno to [ELOOP].

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao 2023-01-15 00:57:09 +08:00 committed by archer
parent a32124879d
commit b1899ffbfd
2 changed files with 7 additions and 1 deletions
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7
fs/vfs/fs_open.c
View File

@ -99,7 +99,7 @@ static int file_vopen(FAR struct file *filep, FAR const char *path,
/* Get an inode for this file */
SETUP_SEARCH(&desc, path, false);
SETUP_SEARCH(&desc, path, (oflags & O_NOFOLLOW) != 0);
ret = inode_find(&desc);
if (ret < 0)
@ -117,6 +117,11 @@ static int file_vopen(FAR struct file *filep, FAR const char *path,
inode = desc.node;
DEBUGASSERT(inode != NULL);
if (desc.nofollow && INODE_IS_SOFTLINK(inode))
{
return -ELOOP;
}
#if defined(CONFIG_BCH) && \
!defined(CONFIG_DISABLE_MOUNTPOINT) && \
!defined(CONFIG_DISABLE_PSEUDOFS_OPERATIONS)

1
include/fcntl.h
View File

@ -53,6 +53,7 @@
#define O_DIRECT (1 << 9) /* Avoid caching, write directly to hardware */
#define O_CLOEXEC (1 << 10) /* Close on execute */
#define O_DIRECTORY (1 << 11) /* Must be a directory */
#define O_NOFOLLOW (1 << 12) /* Don't follow links */
/* Unsupported, but required open flags */