9pfs/solanum-vs-hackint-and-charybdis
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Tidy up daemonisation with regard to file descriptor mess

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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
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GPG key ID: EC6F86EE9CD840B5
1 changed files with 27 additions and 59 deletions
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86
src/ircd.c
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@ -149,39 +149,6 @@ ircd_shutdown(const char *reason)
exit(0); 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 * init_sys
* *
@ -213,17 +180,18 @@ init_sys(void)
static int static int
make_daemon(void) make_daemon(void)
{ {
int pid; int pid, nullfd, fdx;
int pip[2];
char c;
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); exit(EXIT_FAILURE);
} }
dup2(pip[1], 0);
close(pip[1]);
if((pid = fork()) < 0) if((pid = fork()) < 0)
{ {
perror("fork"); perror("fork");
@ -231,22 +199,20 @@ make_daemon(void)
} }
else if(pid > 0) else if(pid > 0)
{ {
close(0); inotice("now running in background mode from %s as pid %d ...",
/* Wait for initialization to finish, successfully or ConfigFileEntry.dpath, pid);
* unsuccessfully. Until this point the child may still
* write to stdout/stderr. exit(EXIT_SUCCESS);
* -- jilles */
if (read(pip[0], &c, 1) > 0)
exit(EXIT_SUCCESS);
else
exit(EXIT_FAILURE);
} }
close(pip[0]); for(fdx = 0; fdx <= 2; fdx++)
setsid(); if (fdx != nullfd)
/* fclose(stdin); (void) dup2(nullfd, fdx);
fclose(stdout);
fclose(stderr); */ if(nullfd > 2)
(void) close(nullfd);
(void) setsid();
return 0; return 0;
} }
@ -619,9 +585,6 @@ main(int argc, char *argv[])
if(!testing_conf) if(!testing_conf)
{ {
check_pidfile(pidFileName); check_pidfile(pidFileName);
if(!server_state_foreground)
make_daemon();
inotice("starting %s ...", ircd_version); inotice("starting %s ...", ircd_version);
inotice("%s", rb_lib_version()); inotice("%s", rb_lib_version());
} }
@ -739,7 +702,6 @@ main(int argc, char *argv[])
construct_umodebuf(); construct_umodebuf();
check_class(); check_class();
write_pidfile(pidFileName);
load_help(); load_help();
open_logfiles(); open_logfiles();
@ -758,7 +720,13 @@ main(int argc, char *argv[])
if(splitmode) if(splitmode)
check_splitmode_ev = rb_event_add("check_splitmode", check_splitmode, NULL, 5); 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); rb_lib_loop(0);