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Poll() uses the array smallbits that is big enough to hold 32 struct

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pollfd's to avoid calling malloc() on small numbers of fd's.  Because
smalltype's members have type char, its address might be misaligned
for a struct pollfd.  Change the array of char to an array of struct
pollfd.

PR:		kern/58214
Submitted by:	Stefan Farfeleder <stefan@fafoe.narf.at>
Reviewed by:	bde (a long time ago)
MFC after:	3 days
This commit is contained in:
Andre Oppermann 2004-08-27 21:23:50 +00:00
parent 5f56967319
commit 2580f4e584
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=134404
1 changed files with 3 additions and 3 deletions
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6
sys/kern/sys_generic.c
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@ -848,8 +848,8 @@ poll(td, uap)
struct thread *td;
struct poll_args *uap;
{
caddr_t bits;
char smallbits[32 * sizeof(struct pollfd)];
struct pollfd *bits;
struct pollfd smallbits[32];
struct timeval atv, rtv, ttv;
int error = 0, timo;
u_int ncoll, nfds;
@ -908,7 +908,7 @@ poll(td, uap)
mtx_unlock_spin(&sched_lock);
mtx_unlock(&sellock);
error = pollscan(td, (struct pollfd *)bits, nfds);
error = pollscan(td, bits, nfds);
mtx_lock(&sellock);
if (error || td->td_retval[0])
goto done;