Documentation of euidaccess() and eaccess().

man3/eaccess.3

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+.so man3/euidaccess.3

man3/euidaccess.3

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+.TH EUIDACCESS 3 2007-05-18 "" "Linux Programmer's Manual"
+.SH NAME
+euidaccess, eaccess \- check effective user's permissions for a file
+.SH SYNOPSIS
+.nf
+.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 (),
+.BR euidaccess ()
+checks permissions and existence of the file identified by its argument
+.IR pathname .
+However, whereas 
+.BR access (),
+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 ().
+
+.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 ().
+.SH "CONFORMING TO"
+These functions are non-standard.
+Some other systems have an
+.\" e.g., FreeBSD 6.1.
+.BR eaccess ()
+function.
+.SH "GLIBC NOTES"
+The 
+.BR eaccess ()
+function was added to glibc in version 2.4.
+.SH "SEE ALSO"
+.BR access (2),
+.\" FIXME add SEE ALSO in access.2 referring to this page
+.BR chmod (2),
+.BR chown (2),
+.\" FIXME add SEE ALSO in faccessat.2 referring to this page
+.BR faccessat (2),
+.BR open (2),
+.BR path_resolution (2),
+.BR setgid (2),
+.BR setuid (2),
+.BR stat (2)