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0a36760f7a
When calling clone() and clone3(), the user is allowed to specify a signal to be sent to the parent process on exit. Respect this value by storing it in the Process struct and sending the signal on exit. Add a test as well to verify that the signal is properly delivered to the parent.
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
// SPDX-License-Identifier: MPL-2.0
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#define _GNU_SOURCE
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#include <err.h>
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#include <linux/sched.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/syscall.h>
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#include <sys/wait.h>
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static pid_t sys_clone3(struct clone_args *args)
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{
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return syscall(SYS_clone3, args, sizeof(struct clone_args));
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}
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int child_exit_recv = 0;
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void sig_handler(int signal)
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{
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printf("Received child exit signal\n");
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child_exit_recv++;
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}
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int main(int argc, char *argv[])
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{
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pid_t pid;
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struct clone_args args = {
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.exit_signal = SIGUSR2,
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};
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signal(SIGUSR2, sig_handler);
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pid = sys_clone3(&args);
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if (pid < 0)
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err(EXIT_FAILURE, "Failed to create new process");
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if (pid == 0) {
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printf("Child process with pid %d\n", getpid());
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exit(EXIT_SUCCESS);
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}
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/*
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* From the clone(2) manual:
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* If [the exit signal] is specified as anything other than SIGCHLD,
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* then the parent process must specify the __WALL or __WCLONE
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* options when waiting for the child with wait(2).
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*/
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waitpid(pid, NULL, __WALL);
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if (child_exit_recv != 1)
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errx(EXIT_FAILURE, "did not receive exit signal from child");
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return 0;
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}
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