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Kernel: Add a systrace() syscall and implement /bin/strace using it.

Calling systrace(pid) gives you a file descriptor with a stream of the
syscalls made by a peer process. The process must be owned by the same
UID who calls systrace(). :^)
This commit is contained in:
Andreas Kling 2019-04-22 18:44:45 +02:00
parent 6693cfb26a
commit 5c68929aa1
12 changed files with 188 additions and 1 deletions

40
Userland/strace.cpp Normal file
View file

@ -0,0 +1,40 @@
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <AK/Assertions.h>
#include <AK/Types.h>
#include <Kernel/Syscall.h>
int main(int argc, char** argv)
{
if (argc < 2)
return 1;
int pid = atoi(argv[1]);
int fd = systrace(pid);
if (fd < 0) {
perror("systrace");
return 1;
}
for (;;) {
dword call[5];
int nread = read(fd, &call, sizeof(call));
if (nread == 0)
break;
if (nread < 0) {
perror("read");
return 1;
}
ASSERT(nread == sizeof(call));
printf("%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;
}