realpath man page on 4.4BSD

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REALPATH(3)		 BSD Library Functions Manual		   REALPATH(3)

     realpath — returns the canonicalized absolute pathname

     #include <sys/param.h>
     #include <stdlib.h>

     char *
     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
     MAXPATHLEN characters.

     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 resolved_name on success.	If an error
     occurs, realpath() returns NULL, and resolved_name 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).

     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 resolved_path when given a relative pathname.


     The realpath() function call first appeared in 4.4BSD.

BSD			      September 24, 2021			   BSD

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