minix/lib/libc/sys-minix/ptrace.c

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#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <string.h>
#include <sys/ptrace.h>
#ifdef __weak_alias
__weak_alias(ptrace, _ptrace)
#endif
long ptrace(int req, pid_t pid, long addr, long data)
{
message m;
memset(&m, 0, sizeof(m));
m.PM_PTRACE_PID = pid;
m.PM_PTRACE_REQ = req;
m.PM_PTRACE_ADDR = addr;
m.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.PM_PTRACE_DATA == -1) errno = 0;
return(m.PM_PTRACE_DATA);
}