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Annotation of 43BSDReno/lib/libc/sys/access.2, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)access.2    6.6 (Berkeley) 5/13/90
        !             6: .\"
        !             7: .TH ACCESS 2 "May 13, 1990"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: access \- determine accessibility of file
        !            11: .SH SYNOPSIS
        !            12: .nf
        !            13: .ft B
        !            14: #include <unistd.h>
        !            15: 
        !            16: accessible = access(path, mode)
        !            17: int accessible;
        !            18: char *path;
        !            19: int mode;
        !            20: .ft R
        !            21: .fi
        !            22: .SH DESCRIPTION
        !            23: .I Access
        !            24: checks the given
        !            25: file
        !            26: .I path
        !            27: for accessibility according to
        !            28: .IR mode ,
        !            29: which is the bitwise inclusive OR of the access permissions to be
        !            30: checked (R_OK for read permission, W_OK for write permission and X_OK
        !            31: for execute/search permission) or the existence test, F_OK.
        !            32: Specifying
        !            33: .I mode
        !            34: as F_OK tests whether the directories leading to the file can be
        !            35: searched and the file exists.
        !            36: .PP
        !            37: The real user ID and the group access list
        !            38: (including the real group ID) are
        !            39: used in verifying permission, so this call
        !            40: is useful to set-UID programs.
        !            41: .PP
        !            42: Notice that only access bits are checked.
        !            43: A directory may be indicated as writable by
        !            44: .IR access ,
        !            45: but an attempt to open it for writing will fail
        !            46: (although files may be created there);
        !            47: a file may look executable, but
        !            48: .I execve
        !            49: will fail unless it is in proper format.
        !            50: .SH "RETURN VALUE
        !            51: If
        !            52: .I path
        !            53: cannot be found or if any of the desired access modes would
        !            54: not be granted, then a \-1 value is returned; otherwise
        !            55: a 0 value is returned.
        !            56: .SH "ERRORS
        !            57: Access to the file is denied if one or more of the following are true:
        !            58: .TP 15
        !            59: [ENOTDIR]
        !            60: A component of the path prefix is not a directory.
        !            61: .TP 15
        !            62: [EINVAL]
        !            63: The pathname contains a character with the high-order bit set.
        !            64: .TP 15
        !            65: [ENAMETOOLONG]
        !            66: A component of a pathname exceeded 255 characters,
        !            67: or an entire path name exceeded 1023 characters.
        !            68: .TP 15
        !            69: [ENOENT]
        !            70: The named file does not exist.
        !            71: .TP 15
        !            72: [EACCES]
        !            73: Search permission is denied for a component of the path prefix.
        !            74: .TP 15
        !            75: [ELOOP]
        !            76: Too many symbolic links were encountered in translating the pathname.
        !            77: .TP 15
        !            78: [EROFS]
        !            79: Write access is requested for a file on a read-only file system.
        !            80: .TP 15
        !            81: [ETXTBSY]
        !            82: Write access is requested for a pure procedure (shared text)
        !            83: file that is being executed.
        !            84: .TP 15
        !            85: [EACCES]
        !            86: Permission bits of the file mode do not permit the requested
        !            87: access, or search permission is denied on a component of the
        !            88: path prefix.  The owner of a file has permission checked with
        !            89: respect to the ``owner'' read, write, and execute mode bits,
        !            90: members of the file's group other than the owner have permission
        !            91: checked with respect to the ``group'' mode bits, and all
        !            92: others have permissions checked with respect to the ``other''
        !            93: mode bits.
        !            94: .TP 15
        !            95: [EFAULT]
        !            96: .I Path
        !            97: points outside the process's allocated address space.
        !            98: .TP 15
        !            99: [EIO]
        !           100: An I/O error occurred while reading from or writing to the file system.
        !           101: .SH "SEE ALSO
        !           102: chmod(2), stat(2)

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