Sigchld

ckamheng · 10-09-2005, 10:35 PM

Dear expert,

why kernel keeps on sending SIGCHLD to my program???
Anything wrong with it?

i am using 2.4 kernel, i wonder will the kernel sends SIGCHLD to my process when exiting a thread since thread is treated as child process in 2.4 kernel??

paulsm4 · 10-09-2005, 11:11 PM

Refer to any book on Unix/Linux system programming, or look here:
http://www.linuxjournal.com/article/2335
... or ...
http://www.win.tue.nl/~aeb/linux/lk/lk-5.html

It sounds like:
a) You've done fork()/exec() (or something similar) to create a child process, and
b) The child process has exited (either normally or abnormally), but
c) You haven't called wait(), or haven't set a signal handler for SIGCHLD (if only "signal (SIG_IGN)" for SIGCHLD).