Date: Wed, 22 Nov 2000 15:20:13 -0800 (PST) From: Mikko Tyolajarvi <mikko@dynas.se> To: wollman@khavrinen.lcs.mit.edu Cc: freebsd-hackers@freebsd.org Subject: Re: RFC: /dev/console -> /var/log/messages idea/patch Message-ID: <200011222320.eAMNKDx45514@explorer.rsa.com> References: <1470.974928159@critter> <200011222239.RAA48717@khavrinen.lcs.mit.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
In local.freebsd-current you write:
><<On Wed, 22 Nov 2000 22:22:39 +0100, Poul-Henning Kamp <phk@critter.freebsd.dk> said:
>> Another particular thing I remember was that some syslog-challenged
>> daemons whine on /dev/console long after /etc/rc has finished.
>They can try, but by the time they do the console has already been
>revoke()d, so they no longer have access to the real console.
>I've thought about writing daemon(8) which will put these turkeys in
>their place. Just a Small Matter of Programming....
Do you mean something like this?
$.02,
/Mikko
---8<-----------------------------------------------------
/*
* Description:
* Utility to start a program as a daemon.
* Closes stdin/out/err and execs the program.
* Program is located using PATH.
*
* Usage:
* daemon [options] program [ args to program ]
*
* Options:
* -c Do not close stdin/out/err
* -d Do not chdir("/")
* -o file Append stdout/err to file
* -p file Write pid to file
* -u user User to run program as
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <pwd.h>
#include <err.h>
#include <sys/stat.h>
#define PROGNAME "daemon"
#define USAGE "Usage: " PROGNAME \
" [-c] [-o output] [-p pidfile] [-u user] program [args ...]"
int
main(int argc, char **argv)
{
int fd, c, noclose, nochdir;
char *outfile, *prog, *s, *pidfile;
FILE *pf;
struct passwd *pw;
char *user;
noclose = 0;
nochdir = 0;
outfile = NULL;
pidfile = NULL;
user = NULL;
fd = -1;
pf = NULL;
pw = NULL;
while ((c = getopt(argc, argv, "cdo:p:u:")) != -1) {
switch (c) {
case 'c':
noclose++;
break;
case 'd':
nochdir++;
break;
case 'o':
outfile = optarg;
noclose++;
break;
case 'p':
pidfile = optarg;
break;
case 'u':
user = optarg;
break;
default:
errx(2, USAGE);
}
}
if (optind == argc)
errx(2, USAGE);
if (user != NULL && (pw = getpwnam(user)) == NULL)
errx(EXIT_FAILURE, "user unknown: \"%s\"", user);
if (pidfile != NULL && ((pf = fopen(pidfile, "w")) == NULL))
err(EXIT_FAILURE, "cannot create \"%s\"", pidfile);
if (outfile != NULL) {
if ((fd = open(outfile, O_WRONLY | O_APPEND | O_CREAT, 0644)) < 0) {
err(EXIT_FAILURE, "cannot create \"%s\"", outfile);
}
}
if (pw != NULL) {
initgroups(pw->pw_name, pw->pw_gid);
if (setuid(pw->pw_uid) < 0)
err(EXIT_FAILURE, "setuid(%d)", pw->pw_uid);
}
if (daemon(nochdir, noclose) < 0)
err(EXIT_FAILURE, "daemon");
if (pidfile != NULL) {
fprintf(pf, "%u\n", (unsigned)getpid());
fclose(pf);
}
if (fd != -1) {
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
close(fd);
}
prog = argv[optind];
if ((s = strrchr(argv[optind], '/')) != 0) {
argv[optind] = s+1;
}
execvp(prog, argv + optind);
err(EXIT_FAILURE, "cannot exec %s", prog);
if (pidfile != NULL) {
unlink(pidfile);
}
exit(EXIT_FAILURE);
}
--
Mikko Työläjärvi_______________________________________mikko@rsasecurity.com
RSA Security
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200011222320.eAMNKDx45514>