isatty() - (nf)
utzoo!decvax!pur-ee!uiucdcs!uicsovax!hamilton
utzoo!decvax!pur-ee!uiucdcs!uicsovax!hamilton
Mon Sep 20 11:38:40 AEST 1982
#N:uicsovax:2200006:000:695
uicsovax!hamilton Sep 17 18:44:00 1982
isatty() uses gtty() to determine whether a file is a tty. it works fine,
but when the file is not a tty, the global errno gets set. this can
confuse some autodiagnostic functions (eg perror) that get called for
non-syscall related errors. i propose the following slightly modified
isatty.c:
/* @(#)isatty.c 4.1 (Berkeley) 12/21/80 */
/*
* Returns 1 iff file is a tty
*/
#include <sgtty.h>
extern int errno;
isatty (f)
{
register int save_errno = errno;
struct sgttyb ttyb;
if (gtty(f, &ttyb) < 0) {
errno = save_errno;
return(0);
}
return(1);
}
wayne hamilton ({ucbvax,harpo}!pur-ee!uiucdcs!uicsovax!hamilton)
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