faccessat(2) - Linux man page
Name
faccessat - change permissions of a file relative to a directory file descriptorSynopsis
#include <unistd.h> int faccessat(int dirfd, const char *path, int int " flags );
Description
If the pathname given in path is relative, then it is interpreted relative to the directory referred to by the file descriptor dirfd (rather than relative to the current working directory of the calling process, as is done by access(2) for a relative pathname).
If the pathname given in path is relative and dirfd is the special value AT_FDCWD, then path is interpreted relative to the current working directory of the calling process (like access(2)).
If the pathname given in path is absolute, then dirfd is ignored.
flags is constructed by ORing together zero or more of the following values:
- AT_EACCESS
- Perform access checks using the effective user and group IDs. By default, faccessat() uses the effective IDs (like access(2)).
- AT_SYMLINK_NOFOLLOW
- If path is a symbolic link, do not dereference it: instead return information about the link itself.
Return Value
On success, faccessat() returns 0. On error, -1 is returned and errno is set to indicate the error.Errors
The same errors that occur for access(2) can also occur for faccessat(). The following additional errors can occur for faccessat():- EBADF
- dirfd is not a valid file descriptor.
- EINVAL
- Invalid flag specified in flags.
- ENOTDIR
- path is a relative path and dirfd is a file descriptor referring to a file other than a directory.
