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[lcd4linux @ 2000-10-25 08:10:48 by reinelt]

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added restart funnctionality
(lots of this code was stolen from sendmail.c)

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@68 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
This commit is contained in:
reinelt
2000-10-25 08:10:48 +00:00
parent 2415ddad4b
commit 6a644394ec
1 changed files with 55 additions and 10 deletions
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65
lcd4linux.c
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@@ -1,4 +1,4 @@
/* $Id: lcd4linux.c,v 1.27 2000/08/10 18:42:20 reinelt Exp $
/* $Id: lcd4linux.c,v 1.28 2000/10/25 08:10:48 reinelt Exp $
*
* LCD4Linux
*
@@ -20,6 +20,11 @@
*
*
* $Log: lcd4linux.c,v $
* Revision 1.28 2000/10/25 08:10:48 reinelt
*
* added restart funnctionality
* (lots of this code was stolen from sendmail.c)
*
* Revision 1.27 2000/08/10 18:42:20 reinelt
*
* fixed some bugs with the new syslog code
@@ -158,6 +163,8 @@
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include <errno.h>
#include <signal.h>
@@ -168,6 +175,7 @@
#include "processor.h"
char *release="LCD4Linux " VERSION " (c) 2000 Michael Reinelt <reinelt@eunet.at>";
char **my_argv;
char *output=NULL;
int got_signal=0;
int debugging=1;
@@ -248,6 +256,13 @@ int main (int argc, char *argv[])
int c, smooth;
int quiet=0;
// save arguments for restart
my_argv=malloc(sizeof(char*)*(argc+1));
for (c=0; c<argc; c++) {
my_argv[c]=strdup(argv[c]);
}
my_argv[c]=NULL;
while ((c=getopt (argc, argv, "c:dFf:hlo:qv"))!=EOF) {
switch (c) {
case 'c':
@@ -293,26 +308,46 @@ int main (int argc, char *argv[])
if (!foreground) {
pid_t i;
int fd;
debug ("going background...");
i=fork();
if (i<0) {
error ("fork() failed: %s", strerror(errno));
exit (1);
}
if (i!=0)
exit (0);
if (i!=0) exit (0);
// close stdin/out/err ???
// open (dev/null) ???
// ignore nasty signals
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
// detach stdin
if (freopen("/dev/null", "r", stdin)==NULL) {
error ("freopen (/dev/null) failed: %s", strerror(errno));
exit (1);
}
// detach stdout and stderr
fd=open("/dev/null", O_WRONLY, 0666);
if (fd==-1) {
error ("open (/dev/null) failed: %s", strerror(errno));
exit (1);
}
fflush(stdout);
fflush(stderr);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
close(fd);
}
if (foreground)
if (foreground) {
debug ("LCD4Linux " VERSION);
else
} else {
info ("Version " VERSION " starting");
if (my_argv[0]==NULL || my_argv[0][0]!='/') {
info ("invoked without full path; restart may not work!");
}
}
// set default values
cfg_set ("row1", "*** %o %v ***");
cfg_set ("row2", "%p CPU %r MB RAM");
cfg_set ("row3", "Busy %cu%% $r10cu");
@@ -332,6 +367,7 @@ int main (int argc, char *argv[])
exit (1);
}
// now install our own signal handler
signal(SIGHUP, handler);
signal(SIGINT, handler);
signal(SIGQUIT, handler);
@@ -365,7 +401,16 @@ int main (int argc, char *argv[])
lcd_quit();
if (got_signal==SIGHUP) {
debug ("restarting");
int i, j;
debug ("restarting...");
// close all files on exec
for (i=3; i<OPEN_MAX; i++) {
if ((j=fcntl(i,F_GETFD,0))!=-1)
fcntl(i,F_SETFD,j|FD_CLOEXEC);
}
execv (my_argv[0], my_argv);
error ("execv() failed: %s", strerror(errno));
exit(1);
}
exit (0);
}