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#define STP_NETLINK_ONLY
#define STP_NUM_STRINGS 1
#include "runtime.h"
#include "counter.c"
#include "probes.c"
MODULE_DESCRIPTION("SystemTap probe: count2");
MODULE_AUTHOR("Martin Hunt <hunt@redhat.com>");
Counter opens;
Counter reads;
Counter writes;
Counter read_bytes;
Counter write_bytes;
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_counter_add (reads, 1);
_stp_counter_add (read_bytes, count);
jprobe_return();
return 0;
}
asmlinkage ssize_t inst_sys_write (unsigned int fd, const char __user * buf, size_t count)
{
_stp_counter_add (writes, 1);
_stp_counter_add (write_bytes, 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))
int probe_start(void)
{
opens = _stp_counter_init();
reads = _stp_counter_init();
writes = _stp_counter_init();
read_bytes = _stp_counter_init();
write_bytes = _stp_counter_init();
return _stp_register_jprobes (stp_probes, MAX_STP_ROUTINE);
}
static void probe_exit (void)
{
int i;
_stp_unregister_jprobes (stp_probes, MAX_STP_ROUTINE);
_stp_printf ("open calls: %lld\n", _stp_counter_get(opens, 0));
_stp_printf ("read calls: %lld\n", _stp_counter_get(reads, 0));
_stp_printf ("read bytes: %lld\n", _stp_counter_get(read_bytes, 0));
_stp_printf ("write calls: %lld\n", _stp_counter_get(writes, 0));
_stp_printf ("write bytes: %lld\n", _stp_counter_get(write_bytes, 0));
_stp_print_flush();
}
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