请问link源程序的加粗这一段是什么意思？
/* link utility for GNU.Copyright (C) 2001-2002 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.*/
/* Written by Michael Stone */
/* Implementation overview:
Simply call the system 'link' function */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include <assert.h>
#include "system.h"
#include "error.h"
#include "long-options.h"
#include "quote.h"
/* The official name of this program (e.g., no `g' prefix).*/
#define PROGRAM_NAME "link"
#define AUTHORS "Michael Stone"
/* Name this program was run with.*/
char *program_name;
void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s FILE1 FILE2\n\
or:%s OPTION\n"), program_name, program_name);
fputs (_("Call the link function to create a link named FILE2\
to an existing FILE1.\n\n"),
stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
}
exit (status);
}
int
main (int argc, char **argv)
{
program_name = argv;
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
AUTHORS, usage);
/* The above handles --help and --version.
Since there is no other invocation of getopt, handle `--' here.*/
if (1 < argc && STREQ (argv, "--"))
{
--argc;
++argv;
}
if (argc < 3)
{
error (0, 0, _("too few arguments"));
usage (EXIT_FAILURE);
}
if (3 < argc)
{
error (0, 0, _("too many arguments"));
usage (EXIT_FAILURE);
}
if (link (argv, argv) != 0)
error (EXIT_FAILURE, errno, _("cannot create link %s to %s"),
quote_n (0, argv), quote_n (1, argv));
exit (EXIT_SUCCESS);
} 调用link函数
man link 这个函数的源代码在哪？
I need it.
3x
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