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[lcd4linux @ 2003-08-08 06:58:06 by reinelt]

Browse Source 
improved forking

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@207 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
This commit is contained in:
reinelt
2003-08-08 06:58:06 +00:00
parent 0184cfba3e
commit 1934af04c4
4 changed files with 78 additions and 55 deletions
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92
lcd4linux.c
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@@ -1,4 +1,4 @@
/* $Id: lcd4linux.c,v 1.39 2003/07/24 04:48:09 reinelt Exp $
/* $Id: lcd4linux.c,v 1.40 2003/08/08 06:58:06 reinelt Exp $
*
* LCD4Linux
*
@@ -20,6 +20,9 @@
*
*
* $Log: lcd4linux.c,v $
* Revision 1.40 2003/08/08 06:58:06 reinelt
* improved forking
*
* Revision 1.39 2003/07/24 04:48:09 reinelt
* 'soft clear' needed for virtual rows
*
@@ -224,6 +227,7 @@ char *output=NULL;
int got_signal=0;
int debugging=0;
int foreground=0;
int background=0;
int tick, tack;
static void usage(void)
@@ -363,45 +367,9 @@ int main (int argc, char *argv[])
exit(2);
}
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);
// 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) {
info ("Version " VERSION " starting");
} else {
info ("Version " VERSION " starting");
if (my_argv[0]==NULL || my_argv[0][0]!='/') {
info ("invoked without full path; restart may not work!");
}
info ("Version " VERSION " starting");
if (!foreground && (my_argv[0]==NULL || my_argv[0][0]!='/')) {
info ("invoked without full path; restart may not work!");
}
// set default values
@@ -419,6 +387,50 @@ int main (int argc, char *argv[])
exit (1);
}
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);
// ignore nasty signals
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
// chdir("/")
if (chdir("/")!=0) {
error ("chdir(\"/\") failed: %s", strerror(errno));
exit (1);
}
// we want full control over permissions
umask (0);
// 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);
background=1;
}
debug ("initializing driver %s", driver);
if (lcd_init(driver)==-1) {
exit (1);