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[thirdparty/man-pages.git] / man3 / euidaccess.3

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.\" Copyright (C) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
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.TH EUIDACCESS 3 2007-07-26 "" "Linux Programmer's Manual"
.SH NAME
euidaccess, eaccess \- check effective user's permissions for a file
.SH SYNOPSIS
.nf
.B #define _GNU_SOURCE
.B #include <unistd.h>
.sp
.BI "int euidaccess(const char *" pathname ", int " mode );
.BI "int eaccess(const char *" pathname ", int " mode );
.fi
.SH DESCRIPTION
Like
.BR access (2),
.BR euidaccess ()
checks permissions and existence of the file identified by its argument
.IR pathname .
However, whereas
.BR access (2),
performs checks using the real user and group identifiers of the process,
.BR euidaccess ()
uses the effective identifiers.

.I mode
is a mask consisting of one or more of
.BR R_OK ", " W_OK ", " X_OK " and " F_OK ,
with the same meanings as for
.BR access (2).

.BR eaccess ()
is a synonym for
.BR euidaccess (),
provided for compatibility with some other systems.
.SH "RETURN VALUE"
On success (all requested permissions granted), zero is returned.
On error (at least one bit in
.I mode
asked for a permission that is denied, or some other error occurred),
\-1 is returned, and
.I errno
is set appropriately.
.SH ERRORS
As for
.BR access (2).
.SH VERSIONS
The
.BR eaccess ()
function was added to glibc in version 2.4.
.SH "CONFORMING TO"
These functions are nonstandard.
Some other systems have an
.\" e.g., FreeBSD 6.1.
.BR eaccess ()
function.
.SH "SEE ALSO"
.BR access (2),
.BR chmod (2),
.BR chown (2),
.BR faccessat (2),
.BR open (2),
.BR setgid (2),
.BR setuid (2),
.BR stat (2),
.BR credentials (7),
.BR path_resolution (7)