asmlinkage long compat_sys_syslog(u32 type, char __user * buf, u32 len)
{
/* sign extend len */
return sys_syslog(type, buf, (int)len);
}
static int kmsg_read(struct inode * inode, struct file * file,char * buf, int count)
{
return sys_syslog(2,buf,count);
}
static void kmsg_release(struct inode * inode, struct file * file)
{
(void) sys_syslog(0,NULL,0);
}
static int kmsg_open(struct inode * inode, struct file * file)
{
return sys_syslog(1,NULL,0);
}
/*
* stress_klog
* stress kernel logging interface
*/
int stress_klog(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
char *buffer;
ssize_t len;
(void)instance;
len = sys_syslog(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0);
if (len < 0) {
if (!instance)
pr_err(stderr, "%s: cannot determine syslog buffer "
"size: errno=%d (%s)\n",
name, errno, strerror(errno));
return EXIT_NO_RESOURCE;
}
if (len == 0) {
if (!instance)
pr_err(stderr, "%s: zero sized syslog buffer, aborting.\n", name);
return EXIT_NO_RESOURCE;
}
if (len > (ssize_t)(4 * MB)) {
if (!instance)
pr_inf(stderr, "%s: truncating syslog buffer to 4MB\n", name);
len = 4 * MB;
}
buffer = malloc((size_t)len);
if (!buffer) {
pr_err(stderr, "%s: cannot allocate syslog buffer\n", name);
return EXIT_NO_RESOURCE;
}
do {
int ret, buflen = (mwc32() % len) + 1;
ret = sys_syslog(SYSLOG_ACTION_READ_ALL, buffer, buflen);
if (ret < 0)
pr_fail(stderr, "%s: syslog ACTION_READ_ALL failed: "
"errno=%d (%s)\n",
name, errno, strerror(errno));
if (ret > buflen)
pr_fail(stderr, "%s: syslog ACTION_READ_ALL returned more "
"data than was requested.\n", name);
/* open, no-op, ignore failure */
(void)sys_syslog(SYSLOG_ACTION_OPEN, NULL, 0);
/* close, no-op, ignore failure */
(void)sys_syslog(SYSLOG_ACTION_CLOSE, NULL, 0);
/* get unread size, ignore failure */
(void)sys_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0);
/* get size of kernel buffer, ignore return */
(void)sys_syslog(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0);
(*counter)++;
} while (opt_do_run && (!max_ops || *counter < max_ops));
free(buffer);
return EXIT_SUCCESS;
}
asmlinkage long compat_sys_syslog(u32 type, char __user * buf, u32 len)
{
return sys_syslog(type, buf, (int)len);
}
