minix3/lib/libc/sys/ptrace.c

26 lines
651 B
C

#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <string.h>
#include <sys/ptrace.h>
int ptrace(int req, pid_t pid, void *addr, int data)
{
message m;
memset(&m, 0, sizeof(m));
m.m_lc_pm_ptrace.pid = pid;
m.m_lc_pm_ptrace.req = req;
m.m_lc_pm_ptrace.addr = addr;
m.m_lc_pm_ptrace.data = data;
if (_syscall(PM_PROC_NR, PM_PTRACE, &m) < 0) return(-1);
/* There was no error, but -1 is a legal return value. Clear errno if
* necessary to distinguish this case. _syscall has set errno to nonzero
* for the error case.
*/
if (m.m_pm_lc_ptrace.data == -1) errno = 0;
return(m.m_pm_lc_ptrace.data);
}