kill a process given its PID

Question

I never programmed in C before, but I need a C program that kills a process given its PID. I know this question was a lot asked, but I encounter a compilation error that I don't understand. Here is the code built with the things that I could find on the Internet:

#include<stdio.h>
#include<signal.h>

int main (int argc, char *argv[]){

    if (argc != 2 ) return 1;

    int pid = atoi (argv[1]);
    kill (pid, SIGINT);

    return 0;
}

And the logs:

-------------- Build: Debug in processKiller (compiler: GNU GCC Compiler)---------------

mingw32-gcc.exe -Wall -g  -c "D:\.Ce PC\Desktop\ws processKiller\processKiller\main.c" -o obj\Debug\main.o
D:\.Ce PC\Desktop\ws processKiller\processKiller\main.c: In function 'main':
D:\.Ce PC\Desktop\ws processKiller\processKiller\main.c:8:5: warning: implicit declaration of function 'atoi' [-Wimplicit-function-declaration]
     int pid = atoi (argv[1]);
     ^
D:\.Ce PC\Desktop\ws processKiller\processKiller\main.c:9:5: warning: implicit declaration of function 'kill' [-Wimplicit-function-declaration]
     kill (pid, SIGINT);
     ^
mingw32-g++.exe  -o bin\Debug\processKiller.exe obj\Debug\main.o   
obj\Debug\main.o: In function `main':
D:/.Ce PC/Desktop/ws processKiller/processKiller/main.c:9: undefined reference to `kill'
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minute(s), 0 second(s))
2 error(s), 2 warning(s) (0 minute(s), 0 second(s))

Thanks.

For `atoi` you need *stdlib.h* – Iharob Al Asimi Aug 29 '18 at 19:29 — Iharob Al Asimi, Aug 29 '18 at 19:29

score 1 · Answer 1 · edited Aug 29 '18 at 21:24

1

kill is a POSIX function. Since you are on Windows, you will need to find how to kill a process using WINAPI. This is a bit more complicated but this should get you started: How to effectively kill a process in C++ (Win32)?

edited Aug 29 '18 at 21:24

Jonathan Leffler

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answered Aug 29 '18 at 19:30

dangee1705

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I think MinGW will make most or all of POSIX available, I guess `kill()` will be translated internally my MinGW. – Iharob Al Asimi Aug 29 '18 at 19:33
I don't mentioned it, but I need to kill the process "softly", with SIGINT. – Cl00e9ment Aug 29 '18 at 19:36
@IharobAlAsimi I hadn't considered this and you may be correct. – dangee1705 Aug 29 '18 at 19:42

kill a process given its PID

1 Answers1