9pfs/solanum-vs-hackint-and-charybdis
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Tidy up daemonisation with regard to file descriptor mess

Browse source 
This moves daemonisation to the end of initialisation which
vastly simplifies the reporting logic and eliminates the need
for the child to communicate to the parent.

This is a backport from the release/4 branch.
This commit is contained in:
Aaron Jones 2016-08-21 00:34:38 +00:00
parent f70b6f55f9
commit 24ba10b6b1
No known key found for this signature in database
GPG key ID: EC6F86EE9CD840B5
1 changed files with 27 additions and 59 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

86
src/ircd.c
View file

@ -149,39 +149,6 @@ ircd_shutdown(const char *reason)
exit(0);
}
/*
* print_startup - print startup information
*/
static void
print_startup(int pid)
{
int fd;
close(1);
fd = open("/dev/null", O_RDWR);
if (fd == -1) {
perror("open /dev/null");
exit(EXIT_FAILURE);
}
if (fd == 0)
fd = dup(fd);
if (fd != 1)
abort();
inotice("now running in %s mode from %s as pid %d ...",
!server_state_foreground ? "background" : "foreground",
ConfigFileEntry.dpath, pid);
/* let the parent process know the initialization was successful
* -- jilles */
if (!server_state_foreground)
write(0, ".", 1);
if (dup2(1, 0) == -1)
abort();
if (dup2(1, 2) == -1)
abort();
}
/*
* init_sys
*
@ -213,17 +180,18 @@ init_sys(void)
static int
make_daemon(void)
{
int pid;
int pip[2];
char c;
int pid, nullfd, fdx;
if (pipe(pip) < 0)
/* The below is approximately what daemon(1, 0) does, but
we need control over the parent after forking to print
the startup message -- Aaron */
if((nullfd = open("/dev/null", O_RDWR)) < 0)
{
perror("pipe");
perror("open /dev/null");
exit(EXIT_FAILURE);
}
dup2(pip[1], 0);
close(pip[1]);
if((pid = fork()) < 0)
{
perror("fork");
@ -231,22 +199,20 @@ make_daemon(void)
}
else if(pid > 0)
{
close(0);
/* Wait for initialization to finish, successfully or
* unsuccessfully. Until this point the child may still
* write to stdout/stderr.
* -- jilles */
if (read(pip[0], &c, 1) > 0)
exit(EXIT_SUCCESS);
else
exit(EXIT_FAILURE);
inotice("now running in background mode from %s as pid %d ...",
ConfigFileEntry.dpath, pid);
exit(EXIT_SUCCESS);
}
close(pip[0]);
setsid();
/* fclose(stdin);
fclose(stdout);
fclose(stderr); */
for(fdx = 0; fdx <= 2; fdx++)
if (fdx != nullfd)
(void) dup2(nullfd, fdx);
if(nullfd > 2)
(void) close(nullfd);
(void) setsid();
return 0;
}
@ -619,9 +585,6 @@ main(int argc, char *argv[])
if(!testing_conf)
{
check_pidfile(pidFileName);
if(!server_state_foreground)
make_daemon();
inotice("starting %s ...", ircd_version);
inotice("%s", rb_lib_version());
}
@ -739,7 +702,6 @@ main(int argc, char *argv[])
construct_umodebuf();
check_class();
write_pidfile(pidFileName);
load_help();
open_logfiles();
@ -758,7 +720,13 @@ main(int argc, char *argv[])
if(splitmode)
check_splitmode_ev = rb_event_add("check_splitmode", check_splitmode, NULL, 5);
print_startup(getpid());
if(server_state_foreground)
inotice("now running in foreground mode from %s as pid %d ...",
ConfigFileEntry.dpath, getpid());
else
make_daemon();
write_pidfile(pidFileName);
rb_lib_loop(0);