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When no fixed address is given in a shmat() request, pass a hint address

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to vm_map_find() that is less likely to be outside of addressable memory
for 32-bit processes: just past the end of the largest possible heap.
This is the same hint that mmap() uses.
This commit is contained in:
Tim J. Robbins 2004-06-19 14:46:13 +00:00
parent fdbe285cb6
commit 68ba7a1d57
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=130730
1 changed files with 5 additions and 2 deletions
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7
sys/kern/sysv_shm.c
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@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
#include <sys/mman.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/resourcevar.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
@ -370,8 +371,10 @@ kern_shmat(td, shmid, shmaddr, shmflg)
* This is just a hint to vm_map_find() about where to
* put it.
*/
attach_va = round_page((vm_offset_t)p->p_vmspace->vm_taddr
+ maxtsiz + maxdsiz);
PROC_LOCK(p);
attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
lim_max(p, RLIMIT_DATA));
PROC_UNLOCK(p);
}
shm_handle = shmseg->shm_internal;