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Annotation of researchv10dc/man/man2/access.2, revision 1.1.1.1

1.1       root        1: .TH ACCESS 2
                      2: .CT 2 dirs file_inq_creat secur
                      3: .SH NAME
                      4: access \(mi determine accessibility of file
                      5: .SH SYNOPSIS
                      6: .nf
                      7: .B int access(name, mode)
                      8: .B char *name;
                      9: .fi
                     10: .SH DESCRIPTION
                     11: .I Access
                     12: checks the given
                     13: file
                     14: .I name
                     15: for accessibility.
                     16: If \fImode\fL&4\fR
                     17: is nonzero, read access is checked.
                     18: If \fImode\fL&2\fR
                     19: is nonzero, write access is checked.
                     20: If \fImode\fL&1\fR
                     21: is nonzero, execute access is checked.
                     22: If \fImode\fL==\fR0,
                     23: the file merely need exist.
                     24: In any case
                     25: all directories leading to the file
                     26: must permit searches.
                     27: 0 is returned if the access is permitted,,
                     28: \-1 if not.
                     29: .PP
                     30: Permission is checked
                     31: against the real userid and groupid of the process;
                     32: this call is most useful in set-userid and set-groupid programs.
                     33: .PP
                     34: Only access bits are checked.
                     35: A directory may be announced as writable by
                     36: .IR access ,
                     37: but an attempt to open it for writing will fail
                     38: (although files may be created there);
                     39: a file may look executable, but
                     40: .IR exec (2)
                     41: will fail unless it is in proper format.
                     42: .PP
                     43: If the userid of the process is the owner of the file
                     44: access is determined by the three owner bits (0700).
                     45: Otherwise, if the groupid of the process is the group
                     46: of the file access is determined by the three group bits (0070).
                     47: Otherwise access is determined by the three other bits (0007).
                     48: .SH SEE ALSO
                     49: .IR stat (2)
                     50: .SH DIAGNOSTICS
                     51: .BR EACCES ,
                     52: .BR EFAULT ,
                     53: .BR EIO ,
                     54: .BR ELOOP ,
                     55: .BR ENOENT ,
                     56: .BR ENOTDIR ,
                     57: .BR EROFS ,
                     58: .BR ETXTBSY
                     59: .SH BUGS
                     60: On symbolic links permissions are irrelevant and
                     61: .IR access
                     62: returns nonsense.

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