This essentially just does a fork() + setsid().
Needed to e.g. properly spawn background processes.
Signed-off-by: Christoph Heiss <c.he...@proxmox.com>
---
Something similar is already used in e.g. pve-storage to spawn fuse
mounts. If and when this is applied, I'd migrate these sites to this sub
too.
src/PVE/Tools.pm | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/src/PVE/Tools.pm b/src/PVE/Tools.pm
index 0325f53..f5bf24a 100644
--- a/src/PVE/Tools.pm
+++ b/src/PVE/Tools.pm
@@ -1117,6 +1117,36 @@ sub run_fork {
return run_fork_with_timeout(undef, $code, $opts);
}
+sub run_fork_detached {
+ my ($fn) = @_;
+
+ pipe(my $rd, my $wr) or die "failed to create pipe: $!\n";
+
+ my $pid = fork();
+ die "fork failed: $!\n" if !defined($pid);
+
+ if (!$pid) {
+ undef $rd;
+ POSIX::setsid();
+
+ eval { $fn->(); };
+ if (my $err = $@) {
+ print {$wr} "ERROR: $err";
+ }
+ POSIX::_exit(1);
+ };
+ undef $wr;
+
+ my $result = do { local $/ = undef; <$rd> };
+ if ($result =~ /^ERROR: (.*)$/) {
+ die "$1\n";
+ }
+
+ if (waitpid($pid, POSIX::WNOHANG) == $pid) {
+ die "failed to spawn process, process exited with status $?\n";
+ }
+}
+
# NOTE: NFS syscall can't be interrupted, so alarm does
# not work to provide timeouts.
# from 'man nfs': "Only SIGKILL can interrupt a pending NFS operation"
--
2.48.1
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