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FreeBSD 11.0 - man page for vop_access (freebsd section 9)

VOP_ACCESS(9)						   BSD Kernel Developer's Manual					     VOP_ACCESS(9)

VOP_ACCESS, VOP_ACCESSX -- check access permissions of a file or Unix domain socket
#include <sys/param.h> #include <sys/vnode.h> int VOP_ACCESS(struct vnode *vp, accmode_t accmode, struct ucred *cred, struct thread *td); int VOP_ACCESSX(struct vnode *vp, accmode_t accmode, struct ucred *cred, struct thread *td);
This entry point checks the access permissions of the file against the given credentials. Its arguments are: vp The vnode of the file to check. accmode The type of access required. cred The user credentials to check. td The thread which is checking. The accmode is a mask which can contain flags described in <sys/vnode.h>, e.g. VREAD, VWRITE or VEXEC. For VOP_ACCESS(), the only flags that may be set in accmode are VEXEC, VWRITE, VREAD, VADMIN and VAPPEND. To check for other flags, one has to use VOP_ACCESSX() instead.
The vnode will be locked on entry and should remain locked on return.
If the file is accessible in the specified way, then zero is returned, otherwise an appropriate error code is returned.
[EPERM] An attempt was made to change an immutable file. [EACCES] The permission bits the file mode or the ACL do not permit the requested access.
vaccess(9), vaccess_acl_nfs4(9), vaccess_acl_posix1e(9), vnode(9)
This manual page was written by Doug Rabson.
September 18, 2009 BSD

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