Contents

EXC_CRASH (SIGSYS)

A bad argument to a system call terminated the process.

Overview

System calls are low-level interfaces that ask the operating system to perform an action. This signal indicates that the requested system call doesn’t exist.

For example, the code below uses system call number 12345, which isn’t valid and produces a SIGSYS signal.

#include <unistd.h>

int main(int argc, char **argv) {
    syscall(12345);
    return 0;
}

For a list of valid system calls, see the syscall.h header file.

See Also

Exceptions