1 files changed, 126 insertions, 0 deletions
diff --git a/man3p/realpath.3p b/man3p/realpath.3p
new file mode 100644
index 000000000..a7d243bcc
--- /dev/null
+++ b/man3p/realpath.3p
@@ -0,0 +1,126 @@
+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "REALPATH" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" realpath 
+.SH NAME
+realpath \- resolve a pathname
+.SH SYNOPSIS
+.LP
+\fB#include <stdlib.h>
+.br
+.sp
+char *realpath(const char *restrict\fP \fIfile_name\fP\fB,
+.br
+\ \ \ \ \ \  char *restrict\fP \fIresolved_name\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIrealpath\fP() function shall derive, from the pathname pointed
+to by \fIfile_name\fP, an absolute pathname that names
+the same file, whose resolution does not involve \fB'.'\fP , \fB'..'\fP
+, or symbolic links. The generated pathname shall be
+stored as a null-terminated string, up to a maximum of {PATH_MAX}
+bytes, in the buffer pointed to by \fIresolved_name\fP.
+.LP
+If \fIresolved_name\fP is a null pointer, the behavior of \fIrealpath\fP()
+is implementation-defined.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIrealpath\fP() shall return a pointer
+to the resolved name. Otherwise, \fIrealpath\fP() shall
+return a null pointer and set \fIerrno\fP to indicate the error, and
+the contents of the buffer pointed to by \fIresolved_name\fP
+are undefined.
+.SH ERRORS
+.LP
+The \fIrealpath\fP() function shall fail if:
+.TP 7
+.B EACCES
+Read or search permission was denied for a component of \fIfile_name\fP.
+.TP 7
+.B EINVAL
+The \fIfile_name\fP argument is a null pointer.
+.TP 7
+.B EIO
+An error occurred while reading from the file system.
+.TP 7
+.B ELOOP
+A loop exists in symbolic links encountered during resolution of the
+\fIpath\fP argument.
+.TP 7
+.B ENAMETOOLONG
+The length of the \fIfile_name\fP argument exceeds {PATH_MAX} or a
+pathname component is longer than {NAME_MAX}.
+.TP 7
+.B ENOENT
+A component of \fIfile_name\fP does not name an existing file or \fIfile_name\fP
+points to an empty string.
+.TP 7
+.B ENOTDIR
+A component of the path prefix is not a directory.
+.sp
+.LP
+The \fIrealpath\fP() function may fail if:
+.TP 7
+.B ELOOP
+More than {SYMLOOP_MAX} symbolic links were encountered during resolution
+of the \fIpath\fP argument.
+.TP 7
+.B ENAMETOOLONG
+Pathname resolution of a symbolic link produced an intermediate result
+whose length exceeds {PATH_MAX}.
+.TP 7
+.B ENOMEM
+Insufficient storage space is available.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.SS Generating an Absolute Pathname
+.LP
+The following example generates an absolute pathname for the file
+identified by the \fIsymlinkpath\fP argument. The generated
+pathname is stored in the \fIactualpath\fP array.
+.sp
+.RS
+.nf
+
+\fB#include <stdlib.h>
+\&...
+char *symlinkpath = "/tmp/symlink/file";
+char actualpath [PATH_MAX+1];
+char *ptr;
+.sp
+
+ptr = realpath(symlinkpath, actualpath);
+\fP
+.fi
+.RE
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+Since the maximum pathname length is arbitrary unless {PATH_MAX} is
+defined, an application generally cannot supply a
+\fIresolved_name\fP buffer with size {{PATH_MAX}+1}.
+.SH FUTURE DIRECTIONS
+.LP
+In the future, passing a null pointer to \fIrealpath\fP() for the
+\fIresolved_name\fP argument may be defined to have
+\fIrealpath\fP() allocate space for the generated pathname.
+.SH SEE ALSO
+.LP
+\fIgetcwd\fP() , \fIsysconf\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<stdlib.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .