minix/lib/libc/sys-minix/ptrace.c
David van Moolenbroek 24ec0d73b5 Clean up interface to PM and VFS
- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565
2014-03-01 09:05:01 +01:00

29 lines
680 B
C

#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);
}