在 2007-06-22五的 10:37 -0700，David Daney写道： > Bin Chen wrote: > > A little update for this problem, I wrote a propram to test the CTRL-C > > signal, I found if I call: > > > > signal(SIGINT, handler); > > > > in main(), then the program can get the SIGINT when I press CTRL-C, but > > if I comment out this line, the SIGINT can't cause the program exit. > > > > I think this is caused by the default SIGINT processing logic inherited > > from the busybox shell, right? In older busybox version we didn't > > encounter this before, so maybe the reason is the default processing > > logic for SIGINT in older busybox shell is exit. > > > > Will a program started from shell inherit the signal processing > > properties from the shell? > > > > That explains it. I have a busybox 1.00 system that has been annoying > me with this behavior. > > The setting of SIG_DFL/SIG_IGN and the signal mask are inherited by > child processes. If telnetd masked SIGINT or set it to SIG_IGN that > might keep the child processes from receiving the SIGINT. > I solved this problem by modify the ash.c to force the SIGINT to set to SIG_DFL.
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