|EUIDACCESS(3)||Linux Programmer's Manual||EUIDACCESS(3)|
NAMEeuidaccess, eaccess - check effective user's permissions for a file
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include
int euidaccess(const char * pathname , int mode );
int eaccess(const char * pathname , int mode );
DESCRIPTIONLike access(2), euidaccess() checks permissions and existence of the file identified by its argument pathname. However, whereas access(2), performs checks using the real user and group identifiers of the process, euidaccess() uses the effective identifiers.
RETURN VALUEOn success (all requested permissions granted), zero is returned. On error (at least one bit in mode asked for a permission that is denied, or some other error occurred), -1 is returned, and errno is set appropriately.
ERRORSAs for access(2).
VERSIONSThe eaccess() function was added to glibc in version 2.4.
CONFORMING TOThese functions are nonstandard. Some other systems have an eaccess() function.
NOTESWarning: Using this function to check a process's permissions on a file before performing some operation based on that information leads to race conditions: the file permissions may change between the two steps. Generally, it is safer just to attempt the desired operation and handle any permission error that occurs.
SEE ALSOaccess(2), chmod(2), chown(2), faccessat(2), open(2), setgid(2), setuid(2), stat(2), credentials(7), path_resolution(7)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.