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#define STP_NETLINK_ONLY
#define STP_NUM_STRINGS 1
#include "runtime.h"
#include "stat.c"
#include "counter.c"
#include "probes.c"
MODULE_DESCRIPTION("SystemTap probe: count1");
MODULE_AUTHOR("Martin Hunt <hunt@redhat.com>");
Counter opens;
Stat reads;
Stat writes;
asmlinkage long inst_sys_open (const char __user * filename, int flags, int mode)
{
_stp_counter_add (opens, 1);
jprobe_return();
return 0;
}
asmlinkage ssize_t inst_sys_read (unsigned int fd, char __user * buf, size_t count)
{
_stp_stat_add (reads, count);
jprobe_return();
return 0;
}
asmlinkage ssize_t inst_sys_write (unsigned int fd, const char __user * buf, size_t count)
{
_stp_stat_add (writes, count);
jprobe_return();
return 0;
}
static struct jprobe stp_probes[] = {
{
.kp.addr = (kprobe_opcode_t *)"sys_open",
.entry = (kprobe_opcode_t *) inst_sys_open
},
{
.kp.addr = (kprobe_opcode_t *)"sys_read",
.entry = (kprobe_opcode_t *) inst_sys_read
},
{
.kp.addr = (kprobe_opcode_t *)"sys_write",
.entry = (kprobe_opcode_t *) inst_sys_write
},
};
#define MAX_STP_ROUTINE (sizeof(stp_probes)/sizeof(struct jprobe))
static int pid;
module_param(pid, int, 0);
MODULE_PARM_DESC(pid, "daemon pid");
int init_module(void)
{
int ret;
if (!pid) {
printk("init: Can't start without daemon pid\n");
return -1;
}
if (_stp_transport_open(n_subbufs, subbuf_size, pid) < 0) {
printk("init: Couldn't open transport\n");
return -1;
}
opens = _stp_counter_init();
reads = _stp_stat_init(HIST_LOG,24);
writes = _stp_stat_init(HIST_LINEAR,0,1000,50);
ret = _stp_register_jprobes (stp_probes, MAX_STP_ROUTINE);
return ret;
}
static void probe_exit (void)
{
_stp_unregister_jprobes (stp_probes, MAX_STP_ROUTINE);
_stp_printf ("OPENS: %lld\n", _stp_counter_get(opens, 0));
_stp_stat_print (reads, "READS: count:%C sum:%S avg:%A min:%m max:%M\n%H", 0);
_stp_stat_print (writes, "WRITES: count:%C sum:%S avg:%A min:%m max:%M\n%H", 0);
_stp_print_flush();
}
void cleanup_module(void)
{
_stp_transport_close();
}
MODULE_LICENSE("GPL");
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