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@(#)realpath.3 8.2 (Berkeley) 2/16/94
.Dd February 16, 1994 .Dt REALPATH 3 .Os .Sh NAME .Nm realpath .Nd returns the canonicalized absolute pathname .Sh SYNOPSIS .Fd #include <sys/param.h> .Fd #include <stdlib.h> .Ft "char *" .Fn realpath "const char *pathname" "char resolvedname[MAXPATHLEN]" .Sh DESCRIPTION The .Fn realpath function resolves all symbolic links, extra .Dq / characters and references to
a /./ and
a /../ in .Fa pathname , and copies the resulting absolute pathname into the memory referenced by .Fa resolvedname . The .Fa resolvedname argument .Em must refer to a buffer capable of storing at least .Dv MAXPATHLEN characters.
p The .Fn realpath function will resolve both absolute and relative paths and return the absolute pathname corresponding to .Fa pathname . All but the last component of .Fa pathname must exist when .Fn realpath is called. .Sh "RETURN VALUES" The .Fn realpath function returns .Fa resolved_name on success. If an error occurs, .Fn realpath returns .Dv NULL , and .Fa resolved_name contains the pathname which caused the problem. .Sh ERRORS The function .Fn realpath may fail and set the external variable .Va errno for any of the errors specified for the library functions .Xr chdir 2 , .Xr close 2 , .Xr fchdir 2 , .Xr lstat 2 , .Xr open 2 , .Xr readlink 2 and .Xr getcwd 3 . .Sh CAVEATS This implementation of .Fn realpath differs slightly from the Solaris implementation. The x 4.4 version always returns absolute pathnames, whereas the Solaris implementation will, under certain circumstances, return a relative .Fa resolved_path when given a relative .Fa pathname . .Sh "SEE ALSO" .Xr getcwd 3 .Sh HISTORY The .Fn realpath function call first appeared in x 4.4 .