lib/posix/_fcntl.c

   1 #include <lib.h>
   2 #define fcntl _fcntl
   3 #include <fcntl.h>
   4 #include <stdarg.h>
   5
   6 #if _ANSI
   7 PUBLIC int fcntl(int fd, int cmd, ...)
   8 #else
   9 PUBLIC int fcntl(fd, cmd)
  10 int fd;
  11 int cmd;
  12 #endif
  13 {
  14   va_list argp;
  15   message m;
  16
  17   va_start(argp, cmd);
  18
  19   /* Set up for the sensible case where there is no variable parameter.  This
  20    * covers F_GETFD, F_GETFL and invalid commands.
  21    */
  22   m.m1_i3 = 0;
  23   m.m1_p1 = NIL_PTR;
  24
  25   /* Adjust for the stupid cases. */
  26   switch(cmd) {
  27      case F_DUPFD:
  28      case F_SETFD:
  29      case F_SETFL:
  30         m.m1_i3 = va_arg(argp, int);
  31         break;
  32      case F_GETLK:
  33      case F_SETLK:
  34      case F_SETLKW:
  35      case F_FREESP:
  36         m.m1_p1 = (char *) va_arg(argp, struct flock *);
  37         break;
  38   }
  39
  40   /* Clean up and make the system call. */
  41   va_end(argp);
  42   m.m1_i1 = fd;
  43   m.m1_i2 = cmd;
  44   return(_syscall(FS, FCNTL, &m));
  45 }