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92 lines
2.3 KiB
Groff
92 lines
2.3 KiB
Groff
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.\"
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.\" Devin Reade, 1995
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.\"
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.\" $Id: access.2,v 1.1 1997/02/27 07:32:11 gdr Exp $
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.\"
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.TH ACCESS 2 "16 January 1997" GNO "System Calls"
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.SH NAME
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access \- determine accessibility of file
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.SH SYNOPSIS
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#include <unistd.h>
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.sp 1
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int
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\fBaccess\fR (const char *\fIpath\fR, int \fImode\fR);
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.SH DESCRIPTION
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.I path
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points to a path name naming a file.
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.B access(\|)
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checks the named file
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for accessibility according to
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.IR mode ,
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which is an inclusive or of the following bits:
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.RS
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.IP \fBR_OK\fR
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Test for read permission.
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.IP \fBW_OK\fR
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Test for write permission. Under GNO, a file must have all three of
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its GS/OS write, rename, and destroy bits set to be considered writable.
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.IP \fBX_OK\fR
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Test for execute or search permission. Under GNO, the test will pass if
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the file is of type EXE, S16, a directory, or of type SRC with an EXEC
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auxiliary type.
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.RE
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.LP
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The following value may also be supplied for
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.IR mode :
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.RS
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.IP \fBF_OK\fR
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test whether the directories leading to the file can be searched and the file exists.
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.RE
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.LP
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Notice that only access bits are checked. A directory may be indicated as writable by
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.BR access(\|) ,
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but an attempt to open it for writing will fail
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(although files may be created there); a file may look executable, but
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.B execve(\|)
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will fail unless it is in proper format.
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.SH RETURN VALUES
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.B access(\|)
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returns zero on success. On failure it returns -1 and sets
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.BR errno .
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.SH ERRORS
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.IP EACCES
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Search permission is denied for a component of the path prefix of
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.IR path .
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.sp 1
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The file access permissions do not permit the requested
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access to the file named by
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.IR path .
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.IP EFAULT
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.I path
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points outside the process's allocated address space.
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.IP EINVAL
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An invalid value was specified for
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.IR mode .
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.sp 1
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The length of the path argument exceeds
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.BR FILENAME_MAX .
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.IP EIO
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An I/O error occurred while reading from or writing to the file system.
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.IP ELOOP
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Too many symbolic links were encountered in translating
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.IR path .
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(Not currently possible under GNO.)
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.IP ENOENT
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The file named by
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.I path
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does not exist.
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.IP ENOTDIR
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A component of the path prefix of
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.I path
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is not a directory.
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.SH SYSTEM V ERRORS
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In addtion to the above, the following may also occur:
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.IP ENOENT
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.I path
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points to an empty string.
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.SH BUGS
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Nothing special is done for the AppleShare FST.
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.SH "SEE ALSO"
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.BR chmod (2V),
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.BR stat (2V)
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