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Change a returned value of -1 (NO_PGID) to (uint)(pid_t)~0u >> 1 (0x7fffffff)

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to satisfy the SuSv3/POSIX-2004/etc requirement that "If there is no
foreground process group, tcgetpgrp() shall return a value greater than 1
that does not match the process group ID of any existing process group."
Should fix PR standards/28493 and zsh.
This commit is contained in:
dsl 2004-12-01 21:37:15 +00:00
parent 4b61add729
commit 4eaada98f4
1 changed files with 5 additions and 2 deletions
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7
lib/libc/termios/tcgetpgrp.c
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@ -1,4 +1,4 @@
/* $NetBSD: tcgetpgrp.c,v 1.8 2003/08/07 16:44:13 agc Exp $ */
/* $NetBSD: tcgetpgrp.c,v 1.9 2004/12/01 21:37:15 dsl Exp $ */
/*-
* Copyright (c) 1989, 1993
@ -34,7 +34,7 @@
#if 0
static char sccsid[] = "@(#)termios.c 8.2 (Berkeley) 2/21/94";
#else
__RCSID("$NetBSD: tcgetpgrp.c,v 1.8 2003/08/07 16:44:13 agc Exp $");
__RCSID("$NetBSD: tcgetpgrp.c,v 1.9 2004/12/01 21:37:15 dsl Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
@ -62,5 +62,8 @@ tcgetpgrp(fd)
if (ioctl(fd, TIOCGPGRP, &s) < 0)
return ((pid_t)-1);
if (s == (pid_t)-1)
/* SVID requires a number > 1 that isn't a valid PGID... */
s = (uint)(pid_t)~0u >> 1;
return ((pid_t)s);
}