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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
#include <sys/ptrace.h>
#define ERRCHECK(E)\
if ((E) == -1) {perror(argv[0]); kill(pid, SIGHUP); return -1;}
int main(int argc, char *argv[]) {
if (argc < 2) {
fprintf(stderr, "usage: %s COMMAND [ARGS]...\n" , argv[0]);
return -1;
}
pid_t pid = fork();
if (pid == -1) {
perror(argv[0]);
return -1;
}
if (pid == 0) {
ptrace(PTRACE_TRACEME, 0, NULL, NULL);
raise(SIGSTOP);
if (execvp(argv[1], argv + 1) == -1) {
perror(argv[0]);
return -1;
}
} else {
ERRCHECK(ptrace(PTRACE_ATTACH, pid, NULL, NULL));
int status;
pid_t w = waitpid(pid, &status, __WALL);
ERRCHECK(w);
ERRCHECK(ptrace(PTRACE_CONT, pid, NULL, NULL));
while (1) {
pid_t w = waitpid(pid, &status, __WALL);
ERRCHECK(w);
if (WIFEXITED(status))
return WEXITSTATUS(status);
if (WIFSTOPPED(status)) {
if (WIFSIGNALED(status)) {
errno = 0;
switch (WSTOPSIG(status)) {
case SIGABRT:
case SIGBUS:
case SIGFPE:
case SIGILL:
case SIGSEGV:
ptrace(PTRACE_CONT, pid, NULL, NULL);
break;
default:
ptrace(PTRACE_CONT, pid, NULL, WSTOPSIG(status));
break;
}
if (errno && errno != ESRCH) {
perror("ptrace");
kill(pid, SIGHUP);
return -1;
}
} else ptrace(PTRACE_CONT, pid, NULL, NULL);
}
}
}
}
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