Externally disabling signals for a Linux program.
- by Harry
Hello,
On Linux, is it possible to somehow disable signaling for programs externally... that is, without modifying their source code?
Context:
I'm calling a C (and also a Java) program from within a bash script on Linux. I don't want any interruptions for my bash script, and for the other programs that the script launches (as foreground processes).
While I can use a...
trap '' INT
... in my bash script to disable the Ctrl C signal, this works only when the program control happens to be in the bash code. That is, if I press Ctrl C while the C program is running, the C program gets interrupted and it exits! This C program is doing some critical operation because of which I don't want it be interrupted. I don't have access to the source code of this C program, so signal handling inside the C program is out of question.
#!/bin/bash
trap 'echo You pressed Ctrl C' INT
# A C program to emulate a real-world, long-running program,
# which I don't want to be interrupted, and for which I
# don't have the source code!
#
# File: y.c
# To build: gcc -o y y.c
#
# #include <stdio.h>
# int main(int argc, char *argv[]) {
# printf("Performing a critical operation...\n");
# for(;;); // Do nothing forever.
# printf("Performing a critical operation... done.\n");
# }
./y
Regards,
/HS
