diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/lib.h | 3 | ||||
| -rw-r--r-- | lib/xwrap.c | 24 |
2 files changed, 26 insertions, 1 deletions
@@ -127,12 +127,13 @@ char *xstrndup(char *s, size_t n); char *xstrdup(char *s); void *xmemdup(void *s, long len); char *xmprintf(char *format, ...) printf_format; +void xflush(int flush); void xprintf(char *format, ...) printf_format; void xputsl(char *s, int len); void xputsn(char *s); void xputs(char *s); void xputc(char c); -void xflush(int flush); +void xvdaemon(void); void xexec(char **argv); pid_t xpopen_setup(char **argv, int *pipes, void (*callback)(char **argv)); pid_t xpopen_both(char **argv, int *pipes); diff --git a/lib/xwrap.c b/lib/xwrap.c index cf7fc42a..85fa2405 100644 --- a/lib/xwrap.c +++ b/lib/xwrap.c @@ -182,6 +182,30 @@ void xputc(char c) xflush(0); } +// daemonize via vfork(). Does not chdir("/"), caller should do that first +// note: restarts process from command_main() +void xvdaemon(void) +{ + int fd; + + // vfork and exec /proc/self/exe + if (toys.stacktop) { + xpopen(0, 0, 0); + _exit(0); + } + + // new session id, point fd 0-2 at /dev/null, detach from tty + setsid(); + close(0); + xopen_stdio("/dev/null", O_RDWR); + dup2(0, 1); + if (-1 != (fd = open("/dev/tty", O_RDONLY))) { + ioctl(fd, TIOCNOTTY); + close(fd); + } + dup2(0, 2); +} + // This is called through the XVFORK macro because parent/child of vfork // share a stack, so child returning from a function would stomp the return // address parent would need. Solution: make vfork() an argument so processes |