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#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
int main(void) {
printf("Main program started\n");
int pid = vfork();
if (pid == -1) {
printf("failed to fork - %d", errno);
return 1;
}
if (pid == 0) {
printf("execve: echo hi-from-child\n");
char* argv[] = { "echo", "hi-from-child", NULL };
char* envp[] = { NULL };
if (execve("/bin/echo", argv, envp) == -1) {
perror("Could not execve");
}
} else {
int status = 0;
waitpid(pid, &status, 0);
fprintf(stderr, "Child(%d) exited with %d\n", pid, status);
fprintf(stderr, "execve: echo hi-from-parent\n");
char* argv[] = { "echo", "hi-from-parent", NULL };
char* envp[] = { NULL };
if (execve("/bin/echo", argv, envp) == -1) {
perror("Could not execve");
}
}
return 1;
}
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