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in select(), if it's a small number of file descriptors use a

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automatic array rather than an array allocated with alloca().
(This was the only use of alloca() in the kernel, and it wasn't
necessary or consistent with the way other functions in this file
work.)
This commit is contained in:
cgd 1996-06-13 05:08:47 +00:00
parent d97900c6f4
commit f41d0a3d9b
1 changed files with 3 additions and 2 deletions
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5
sys/kern/sys_generic.c
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@ -1,4 +1,4 @@
/* $NetBSD: sys_generic.c,v 1.25 1996/06/02 14:48:23 mycroft Exp $ */
/* $NetBSD: sys_generic.c,v 1.26 1996/06/13 05:08:47 cgd Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
@ -538,6 +538,7 @@ sys_select(p, v, retval)
syscallarg(struct timeval *) tv;
} */ *uap = v;
caddr_t bits;
char smallbits[howmany(FD_SETSIZE, NFDBITS) * sizeof(fd_mask) * 6];
struct timeval atv;
int s, ncoll, error = 0, timo;
u_int ni;
@ -550,7 +551,7 @@ sys_select(p, v, retval)
if (SCARG(uap, nd) > FD_SETSIZE)
bits = malloc(ni * 6, M_TEMP, M_WAITOK);
else
bits = alloca(ni * 6);
bits = smallbits;
#define getbits(name, x) \
if (SCARG(uap, name)) { \