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/* Block trace command line tool - by D.C. van Moolenbroek */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <minix/btrace.h>
#include <minix/u64.h>
#include <sys/ioctl.h>
static btrace_entry buf[BTBUF_SIZE];
static void __dead
usage(void)
{
fprintf(stderr, "usage:\n"
"%s start <device> <nr_entries>\n"
"%s stop <device> <file>\n"
"%s reset <device>\n"
"%s dump <file>\n",
getprogname(), getprogname(), getprogname(), getprogname());
exit(EXIT_FAILURE);
}
static void
btrace_start(char * device, int nr_entries)
{
int r, ctl, devfd;
size_t size;
if ((devfd = open(device, O_RDONLY)) < 0) {
perror("device open");
exit(EXIT_FAILURE);
}
size = nr_entries;
if ((r = ioctl(devfd, BIOCTRACEBUF, &size)) < 0) {
perror("ioctl(BIOCTRACEBUF)");
exit(EXIT_FAILURE);
}
ctl = BTCTL_START;
if ((r = ioctl(devfd, BIOCTRACECTL, &ctl)) < 0) {
perror("ioctl(BIOCTRACECTL)");
size = 0;
(void)ioctl(devfd, BIOCTRACEBUF, &size);
exit(EXIT_FAILURE);
}
close(devfd);
}
static void
btrace_stop(char * device, char * file)
{
int r, ctl, devfd, outfd;
size_t size;
if ((devfd = open(device, O_RDONLY)) < 0) {
perror("device open");
exit(EXIT_FAILURE);
}
if ((outfd = open(file, O_CREAT | O_TRUNC | O_WRONLY, 0600)) < 0) {
perror("file open");
exit(EXIT_FAILURE);
}
ctl = BTCTL_STOP;
if ((r = ioctl(devfd, BIOCTRACECTL, &ctl)) < 0) {
perror("ioctl(BIOCTRACECTL)");
exit(EXIT_FAILURE);
}
for (;;) {
if ((r = ioctl(devfd, BIOCTRACEGET, buf)) < 0) {
perror("ioctl(BIOCTRACEGET)");
break;
}
if (r == 0) break;
size = r * sizeof(buf[0]);
if ((r = write(outfd, (char *)buf, size)) != size) {
if (r < 0) perror("write");
else fputs("short write\n", stderr);
}
}
close(outfd);
size = 0;
if ((r = ioctl(devfd, BIOCTRACEBUF, &size)) < 0) {
perror("ioctl(BIOCTRACEBUF)");
exit(EXIT_FAILURE);
}
close(devfd);
}
static void
btrace_reset(char * device)
{
size_t size;
int r, ctl, devfd;
if ((devfd = open(device, O_RDONLY)) < 0) {
perror("device open");
exit(EXIT_FAILURE);
}
ctl = BTCTL_STOP;
(void)ioctl(devfd, BIOCTRACECTL, &ctl);
size = 0;
if ((r = ioctl(devfd, BIOCTRACEBUF, &size)) < 0) {
perror("ioctl(BIOCTRACEBUF)");
exit(EXIT_FAILURE);
}
close(devfd);
}
static void
dump_entry(btrace_entry * entry)
{
switch (entry->request) {
case BTREQ_OPEN: printf("OPEN"); break;
case BTREQ_CLOSE: printf("CLOSE"); break;
case BTREQ_READ: printf("READ"); break;
case BTREQ_WRITE: printf("WRITE"); break;
case BTREQ_GATHER: printf("GATHER"); break;
case BTREQ_SCATTER: printf("SCATTER"); break;
case BTREQ_IOCTL: printf("IOCTL"); break;
}
printf(" request\n");
switch (entry->request) {
case BTREQ_OPEN:
printf("- access:\t%x\n", entry->size);
break;
case BTREQ_READ:
case BTREQ_WRITE:
case BTREQ_GATHER:
case BTREQ_SCATTER:
printf("- position:\t%08lx%08lx\n",
ex64hi(entry->position), ex64lo(entry->position));
printf("- size:\t\t%u\n", entry->size);
printf("- flags:\t%x\n", entry->flags);
break;
case BTREQ_IOCTL:
printf("- request:\t%08x\n", entry->size);
break;
}
printf("- start:\t%u us\n", entry->start_time);
printf("- finish:\t%u us\n", entry->finish_time);
if (entry->result == BTRES_INPROGRESS)
printf("- result:\t(in progress)\n");
else
printf("- result:\t%d\n", entry->result);
printf("\n");
}
static void
btrace_dump(char * file)
{
int i, r, infd;
if ((infd = open(file, O_RDONLY)) < 0) {
perror("open");
exit(EXIT_FAILURE);
}
for (;;) {
if ((r = read(infd, (char *)buf, sizeof(buf))) <= 0)
break;
r /= sizeof(buf[0]);
for (i = 0; i < r; i++)
dump_entry(&buf[i]);
}
if (r < 0) perror("read");
close(infd);
}
int main(int argc, char ** argv)
{
int num;
setprogname(argv[0]);
if (argc < 3) usage();
if (!strcmp(argv[1], "start")) {
if (argc < 4) usage();
num = atoi(argv[3]);
if (num <= 0) usage();
btrace_start(argv[2], num);
} else if (!strcmp(argv[1], "stop")) {
if (argc < 4) usage();
btrace_stop(argv[2], argv[3]);
} else if (!strcmp(argv[1], "reset")) {
btrace_reset(argv[2]);
} else if (!strcmp(argv[1], "dump")) {
btrace_dump(argv[2]);
} else
usage();
return EXIT_SUCCESS;
}
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