2.9BSD - /usr/src/lib/c/gen/isapipe.c

   1: /*	@(#)isapipe.c	2.1	SCCS id keyword	*/
   2: /*
   3:  * Returns 1 if file is a pipe or other non-seekable device
   4:  */
   5: 
   6: #include <errno.h>
   7: 
   8: extern  errno;
   9: long lseek();
  10: 
  11: isapipe(f)
  12: int f;
  13: {
  14:     return(lseek(f, 0L, 1) < 0 && errno == ESPIPE);
  15: }

Defined functions