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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2017-08-04 23:04:17 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2017-08-04 23:04:17 +0200 |
| commit | b182e9ad6011909fdb76358431d23d195febaf54 (patch) | |
| tree | 650b66e06387f8b0f7fe054a53150809aede7701 /libbb/vfork_daemon_rexec.c | |
| parent | 692eeb81a4c54d7d8bf0d2e370c12762b2a16ff7 (diff) | |
| download | busybox-b182e9ad6011909fdb76358431d23d195febaf54.tar.gz | |
libbb: use _exit, not exit, in bb_daemonize_or_rexec()
By the time we reach exit in parent, child already exited or execed.
We should not re-run libc cleanup code.
While at it, introduce bb_daemon_helper() and add a few comments.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/vfork_daemon_rexec.c')
| -rw-r--r-- | libbb/vfork_daemon_rexec.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c index 98512bb00..f84e678b5 100644 --- a/libbb/vfork_daemon_rexec.c +++ b/libbb/vfork_daemon_rexec.c @@ -209,6 +209,9 @@ pid_t FAST_FUNC fork_or_rexec(char **argv) /* Maybe we are already re-execed and come here again? */ if (re_execed) return 0; + + /* fflush_all(); ? - so far all callers had no buffered output to flush */ + pid = xvfork(); if (pid) /* parent */ return pid; @@ -245,8 +248,11 @@ void FAST_FUNC bb_daemonize_or_rexec(int flags, char **argv) fd = dup(fd); /* have 0,1,2 open at least to /dev/null */ if (!(flags & DAEMON_ONLY_SANITIZE)) { + + /* fflush_all(); - add it in fork_or_rexec() if necessary */ + if (fork_or_rexec(argv)) - exit(EXIT_SUCCESS); /* parent */ + _exit(EXIT_SUCCESS); /* parent */ /* if daemonizing, detach from stdio & ctty */ setsid(); dup2(fd, 0); @@ -258,7 +264,7 @@ void FAST_FUNC bb_daemonize_or_rexec(int flags, char **argv) * Prevent this: stop being a session leader. */ if (fork_or_rexec(argv)) - exit(EXIT_SUCCESS); /* parent */ + _exit(EXIT_SUCCESS); /* parent */ } } while (fd > 2) { |