man : vaccess(9)
VACCESS(9) OpenBSD Kernel Manual VACCESS(9)
vaccess - check access permissions based on vnode parameters
vaccess(mode_t file_mode, uid_t uid, gid_t gid, mode_t acc_mode, struct
The vaccess() function checks if the credentials described in cred are
sufficient to perform the operation described by acc_mode, based on the
file_mode, uid, and gid arguments. These arguments would typically be
based on the vnode being accessed.
file_mode is the current mode of the file that is having access checked.
The uid and gid arguments are the user id and group id representing the
owner of the file. acc_mode describes the operation desired. It should
be one of VREAD, VWRITE, or VEXEC representing read, write, and execute,
vaccess() will return 0 on success, or a non-zero error value on failure.
[EACCES] Permission denied. An attempt was made to access a file in
a way forbidden by its file access permissions.
This man page was originally written by Robert Watson for FreeBSD. It
was modified to represent the OpenBSD implementation by Peter Werner.
OpenBSD 4.9 September 19, 2010 OpenBSD 4.9