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#include <AK/Assertions.h>
#include <AK/Types.h>
#include <Kernel/Syscall.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static int usage()
{
printf("usage: strace [-p PID] [command...]\n");
return 0;
}
int main(int argc, char** argv)
{
if (argc == 1)
return usage();
pid_t pid = -1;
bool pid_is_child = false;
if (!strcmp(argv[1], "-p")) {
if (argc != 3)
return usage();
pid = atoi(argv[2]);
} else {
pid_is_child = true;
pid = fork();
if (!pid) {
kill(getpid(), SIGSTOP);
int rc = execvp(argv[1], &argv[1]);
if (rc < 0) {
perror("execvp");
exit(1);
}
ASSERT_NOT_REACHED();
}
}
int fd = systrace(pid);
if (fd < 0) {
perror("systrace");
return 1;
}
if (pid_is_child) {
int rc = kill(pid, SIGCONT);
if (rc < 0) {
perror("kill(pid, SIGCONT)");
return 1;
}
}
for (;;) {
u32 call[5];
int nread = read(fd, &call, sizeof(call));
if (nread == 0)
break;
if (nread < 0) {
perror("read");
return 1;
}
ASSERT(nread == sizeof(call));
fprintf(stderr, "%s(%#x, %#x, %#x) = %#x\n", Syscall::to_string((Syscall::Function)call[0]), call[1], call[2], call[3], call[4]);
}
int rc = close(fd);
if (rc < 0) {
perror("close");
return 1;
}
return 0;
}
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