realpath(3C)						   Standard C Library Functions 					      realpath(3C)

NAME

       realpath - resolve pathname

SYNOPSIS

       #include <stdlib.h>

       char *realpath(const char *restrict file_name, char *restrict resolved_name);

DESCRIPTION

       The realpath() function derives, from the pathname pointed to by file_name, an absolute pathname that names the same file, whose resolution
       does not involve ".", "..", or symbolic links. The generated pathname is stored as a null-terminated string, up to a maximum of	{PATH_MAX}
       bytes (defined in limits.h(3HEAD)), in the buffer pointed to by resolved_name.

RETURN VALUES

       On  successful  completion, realpath() returns a pointer to the resolved name.  Otherwise, realpath() returns a null pointer and sets errno
       to indicate the error, and the contents of the buffer pointed to by resolved_name are left in an indeterminate state.

ERRORS

       The realpath() function will fail if:

       EACCES	       Read or search permission was denied for a component of file_name.

       EINVAL	       Either the file_name or resolved_name argument is a null pointer.

       EIO	       An error occurred while reading from the file system.

       ELOOP	       Too many symbolic links were encountered in resolving file_name.

       ELOOP	       A loop exists in symbolic links encountered during resolution of the file_name argument.

       ENAMETOOLONG    The file_name argument is longer than {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

       ENOENT	       A component of file_name does not name an existing file or file_name points to an empty string.

       ENOTDIR	       A component of the path prefix is not a directory.

       The realpath() function may fail if:

       ENAMETOOLONG    Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}.

       ENOMEM	       Insufficient storage space is available.

USAGE

       The realpath() function operates on null-terminated strings.

       Execute permission is required for all the directories in the given and the resolved path.

       The realpath() function might fail to return to the current directory if an error occurs.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getcwd(3C), limits.h(3HEAD), sysconf(3C), attributes(5), standards(5)

SunOS 5.10							    9 Oct 2003							      realpath(3C)