src/linux/ptrace.c

   1 #include <sys/ptrace.h>
   2 #include <stdarg.h>
   3 #include <unistd.h>
   4 #include "syscall.h"
   5
   6 long ptrace(int req, ...)
   7 {
   8         va_list ap;
   9         pid_t pid;
  10         void *addr, *data, *addr2 = 0;
  11         long ret, result;
  12
  13         va_start(ap, req);
  14         pid = va_arg(ap, pid_t);
  15         addr = va_arg(ap, void *);
  16         data = va_arg(ap, void *);
  17         /* PTRACE_{READ,WRITE}{DATA,TEXT} (16...19) are specific to SPARC. */
  18 #ifdef PTRACE_READDATA
  19         if ((unsigned)req - PTRACE_READDATA < 4)
  20                 addr2 = va_arg(ap, void *);
  21 #endif
  22         va_end(ap);
  23
  24         if (req-1U < 3) data = &result;
  25         ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);
  26
  27         if (ret < 0 || req-1U >= 3) return ret;
  28         return result;
  29 }