emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Patch from tito to replace shared memory usage with mlock(), slightly tweaked

Browse Source 
by me.
This commit is contained in:
Rob Landley 2006-05-19 17:24:26 +00:00
parent cf89c37d08
commit 4ae2f511cf
1 changed files with 10 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
miscutils/hdparm.c
View File

@ -25,6 +25,7 @@
#include <sys/time.h>
#include <sys/times.h>
#include <sys/mount.h>
#include <sys/mman.h>
#include <getopt.h>
#include "busybox.h"
#include <linux/types.h>
@ -1406,37 +1407,21 @@ static void do_time(int flag, int fd)
flag = 1 time_device
*/
{
char *buf;
struct itimerval e1, e2;
int shmid;
double elapsed, elapsed2;
unsigned int max_iterations = 1024, total_MB, iterations;
unsigned long long blksize;
RESERVE_CONFIG_BUFFER(buf, TIMING_BUF_BYTES);
if (mlock(buf, TIMING_BUF_BYTES)) {
bb_perror_msg("mlock");
goto quit2;
}
if (0 == do_blkgetsize(fd, &blksize)) {
max_iterations = blksize / (2 * 1024) / TIMING_BUF_MB;
}
if ((shmid = shmget(IPC_PRIVATE, TIMING_BUF_BYTES, 0600)) == -1)
{
bb_perror_msg("shmget"); /*"could not allocate sharedmem buf"*/
return;
}
if (shmctl(shmid, SHM_LOCK, NULL) == -1)
{
bb_perror_msg("shmctl"); /*"could not lock sharedmem buf"*/
(void) shmctl(shmid, IPC_RMID, NULL);
return;
}
if ((buf = shmat(shmid, (char *) 0, 0)) == (char *) -1)
{
bb_perror_msg("shmat"); /*"could not attach sharedmem buf"*/
(void) shmctl(shmid, IPC_RMID, NULL);
return;
}
if (shmctl(shmid, IPC_RMID, NULL) == -1)
bb_perror_msg("shmctl");
/* Clear out the device request queues & give them time to complete */
sync();
sleep(3);
@ -1505,8 +1490,9 @@ static void do_time(int flag, int fd)
print_timing(total_MB, elapsed);
}
quit:
if (-1 == shmdt(buf))
bb_perror_msg("shmdt"); /*"could not detach sharedmem buf"*/
munlock(buf, TIMING_BUF_BYTES);
quit2:
RELEASE_CONFIG_BUFFER(buf);
}
static void on_off (unsigned int value)