table of contents
- wheezy 3.44-1
- jessie 3.74-1
- jessie-backports 4.10-2~bpo8+1
- testing 4.10-2
- unstable 4.10-2
|EUIDACCESS(3)||Linux Programmer's Manual||EUIDACCESS(3)|
NAME¶euidaccess, eaccess - check effective user's permissions for a file
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <unistd.h>int euidaccess(const char *pathname, int mode); int eaccess(const char *pathname, int mode);
DESCRIPTION¶Like 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 VALUE¶On 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.
ERRORS¶As for access(2).
VERSIONS¶The eaccess() function was added to glibc in version 2.4.
CONFORMING TO¶These functions are nonstandard. Some other systems have an eaccess() function.
NOTES¶Warning: 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 ALSO¶access(2), chmod(2), chown(2), faccessat(2), open(2), setgid(2), setuid(2), stat(2), credentials(7), path_resolution(7)
COLOPHON¶This page is part of release 3.44 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/.