realpath - returns the canonicalized absolute pathname
Standard C Library (libc, -lc)
realpath(const char *pathname, char resolvedname[MAXPATHLEN]);
The realpath() function resolves all symbolic links, extra ``/'' characters
and references to /./ and /../ in pathname, and copies the resulting
absolute pathname into the memory referenced by resolvedname. The
resolvedname argument must refer to a buffer capable of storing at least
The realpath() function will resolve both absolute and relative paths and
return the absolute pathname corresponding to pathname. All but the last
component of pathname must exist when realpath() is called.
The realpath() function returns resolvedname on success. If an error
occurs, realpath() returns NULL, and resolvedname contains the pathname
which caused the problem.
The function realpath() may fail and set the external variable errno for
any of the errors specified for the library functions chdir(2), close(2),
fchdir(2), lstat(2), open(2), readlink(2) and getcwd(3).
The realpath() function call first appeared in 4.4BSD.
This implementation of realpath() differs slightly from the Solaris
implementation. The 4.4BSD version always returns absolute pathnames,
whereas the Solaris implementation will, under certain circumstances,
return a relative resolvedname when given a relative pathname.
BSD February 16, 1994 BSD
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