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Reduce fork calls in daemon

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The forked child process is a grandchild process from the viewpoint of
the process which invoked the caller process.  That means the child is
detached at that point, and it does not need to fork twice.
This commit is contained in:
Nobuyoshi Nakada 2022-09-19 00:46:52 +09:00
parent 1c9381283e
commit ae07336529
Notes: git 2022-09-19 15:34:39 +09:00 
Merged: https://github.com/ruby/ruby/pull/6402
1 changed files with 4 additions and 10 deletions
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14
process.c
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@ -7109,20 +7109,14 @@ rb_daemon(int nochdir, int noclose)
#else
int n;
#define fork_daemon() \
switch (rb_fork_ruby(NULL)) { \
case -1: return -1; \
case 0: break; \
default: _exit(EXIT_SUCCESS); \
switch (rb_fork_ruby(NULL)) {
case -1: return -1;
case 0: break;
default: _exit(EXIT_SUCCESS);
}
fork_daemon();
if (setsid() < 0) return -1;
/* must not be process-leader */
fork_daemon();
if (!nochdir)
err = chdir("/");