Linux & Unix – 第21页

linux 源码可能很简单

/*
 * Copyright (C) 2013 Karel Zak <kzak@redhat.com>
 */

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <getopt.h>

#include "c.h"
#include "nls.h"
#include "pathnames.h"

/*
 * Always return EXIT_FAILURE (1), don't try to be smart!
 */

static void __attribute__((__noreturn__)) usage(FILE *out)
{
	fputs(USAGE_HEADER, out);
	fprintf(out,
		_(" %s [options]\n"), program_invocation_short_name);

	fputs(USAGE_SEPARATOR, out);
	fputs(_("Politely refuse a login.\n"), out);

	fputs(USAGE_OPTIONS, out);
	fputs(USAGE_HELP, out);
	fputs(USAGE_VERSION, out);

	fprintf(out, USAGE_MAN_TAIL("nologin(8)"));
	exit(EXIT_FAILURE);
}

int main(int argc, char *argv[])
{
	int c, fd;
	static const struct option longopts[] = {
		{ "help",    0, 0, 'h' },
		{ "version", 0, 0, 'V' },
		{ NULL, 0, 0, 0 }
	};

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	while ((c = getopt_long(argc, argv, "hV", longopts, NULL)) != -1) {
		switch (c) {
		case 'h':
			usage(stdout);
			break;
		case 'V':
			printf(UTIL_LINUX_VERSION);
			return EXIT_FAILURE;
		default:
			usage(stderr);
			break;
		}
	}

	fd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
	if (fd >= 0) {
		char buf[BUFSIZ];
		ssize_t rd;

		while ((rd = read(fd, buf, sizeof(buf))) > 0)
			ignore_result( write(STDOUT_FILENO, buf, rd) );
		close(fd);
	} else
		fprintf(stdout, _("This account is currently not available.\n"));

	return EXIT_FAILURE;
}

#include <stdio.h>

#include <sys/types.h>

#include <fcntl.h>

#include <string.h>

#include <unistd.h>

#include <stdlib.h>

#include <getopt.h>

#include "c.h"

#include "nls.h"

#include "pathnames.h"

* Always return EXIT_FAILURE (1), don't try to be smart!

static void __attribute__((__noreturn__)) usage(FILE *out)

{

fputs(USAGE_HEADER, out);

fprintf(out,

_(" %s [options]\n"), program_invocation_short_name);

fputs(USAGE_SEPARATOR, out);

fputs(_("Politely refuse a login.\n"), out);

fputs(USAGE_OPTIONS, out);

fputs(USAGE_HELP, out);

fputs(USAGE_VERSION, out);

fprintf(out, USAGE_MAN_TAIL("nologin(8)"));

exit(EXIT_FAILURE);

}

int main(int argc, char *argv[])

{

int c, fd;

static const struct option longopts[] = {

{ "help", 0, 0, 'h' },

{ "version", 0, 0, 'V' },

{ NULL, 0, 0, 0 }

};

setlocale(LC_ALL, "");

bindtextdomain(PACKAGE, LOCALEDIR);

textdomain(PACKAGE);

while ((c = getopt_long(argc, argv, "hV", longopts, NULL)) != -1) {

switch (c) {

case 'h':

usage(stdout);

break;

case 'V':

printf(UTIL_LINUX_VERSION);

return EXIT_FAILURE;

default:

usage(stderr);

break;

}

fd = open(_PATH_NOLOGIN_TXT, O_RDONLY);

if (fd >= 0) {

char buf[BUFSIZ];

ssize_t rd;

while ((rd = read(fd, buf, sizeof(buf))) > 0)

ignore_result( write(STDOUT_FILENO, buf, rd) );

close(fd);

} else

fprintf(stdout, _("This account is currently not available.\n"));

return EXIT_FAILURE;

}

& …

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