Quoting libc info page:
When a program is run by a shell, the shell normally sets the initial
actions for the child process to `SIG_DFL' or `SIG_IGN', as appropriate.
It's a good idea to check to make sure that the shell has not set up an
initial action of `SIG_IGN' before you establish your own signal
handlers.
Are there any alternatives for a program that is run by the shell
other than being exec'ed (by the shell)? In the case of the program
being exec'ed by the shell, what is the importance of checking the
initial actions that are set by the shell? I mean, exec resets the
initial actions, doesn't it? In fact, how can the programmer check
the actions that were set by the parent process?
Bottom line is that I am confused about how the shell run programs
and whether those programs inherit the signal handlers.
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