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ZIO
Commit 0fc66367 authored by Federico Vaga's avatar Federico Vaga Committed by Alessandro Rubini
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tools/zio-dump: add -n to stop after reading N blocks 

The -n option tells how many blocks to read from the block source.
The following example will read 3 blocks from zio-zero, channel 0

./zio-dump -n 3 /dev/zio/zzero-0000-0-0-*
Signed-off-by: 's avatarFederico Vaga <federico.vaga@gmail.com>
Acked-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent 24f00e40
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Showing with 39 additions and 20 deletions
tools/zio-dump.c
View file @ 0fc66367
......@@ -177,25 +177,28 @@ void help(char *name)
"Use: \"%s [<opts>] <ctrl-file> <data-file> [...]\"\n"
" or \"%s -c <combined-file>\"\n",
name, name, name);
fprintf(stderr, " -a dump attributes too\n");
fprintf(stderr, " -A dump all attributes\n");
fprintf(stderr, " -c combined file (control+data)\n");
fprintf(stderr, " -a dump attributes too\n");
fprintf(stderr, " -A dump all attributes\n");
fprintf(stderr, " -c combined file (control+data)\n");
fprintf(stderr, " -n <number> stop after that many blocks\n");
exit(1);
}
int main(int argc, char **argv)
{
FILE *f;
char *rest;
char *outfname;
int *cfd; /* control file descriptors */
int *dfd; /* data file descriptors */
fd_set control_set, ready_set;
int c, i, j, maxfd, ndev;
int combined = 0;
unsigned long nblocks = -1; /* forever by default */
prgname = argv[0];
while ((c = getopt (argc, argv, "aAcm")) != -1) {
while ((c = getopt (argc, argv, "aAcmn:")) != -1) {
switch(c) {
case 'a':
opt_print_attr = 1;
......@@ -209,6 +212,14 @@ int main(int argc, char **argv)
case 'm':
opt_print_memaddr = 1;
break;
case 'n':
nblocks = strtoul(optarg, &rest, 0);
if (rest && *rest) {
fprintf(stderr, "%s: not a number \"%s\"\n",
argv[0], optarg);
help(prgname);
}
break;
default:
help(prgname);
}
......@@ -266,25 +277,29 @@ int main(int argc, char **argv)
setlinebuf(stdout);
setbuf(f, NULL);
/* now read control and then data, forever (unless "combined") */
while (!combined) {
ready_set = control_set;
i = select(maxfd + 1, &ready_set, NULL, NULL, NULL);
if (i < 0 && errno == EINTR)
continue;
if (i < 0) {
fprintf(stderr, "%s: select(): %s\n", prgname,
strerror(errno));
exit(1);
if (!combined) {
/* Read control and then data. Forever or nblocks if > 0 */
while (nblocks) {
if (nblocks > 0)
nblocks--;
ready_set = control_set;
i = select(maxfd + 1, &ready_set, NULL, NULL, NULL);
if (i < 0 && errno == EINTR)
continue;
if (i < 0) {
fprintf(stderr, "%s: select(): %s\n", prgname,
strerror(errno));
exit(1);
}
for (j = 0; j < ndev; j++)
if (FD_ISSET(cfd[j], &ready_set))
read_channel(cfd[j], dfd[j], f);
}
for (j = 0; j < ndev; j++)
if (FD_ISSET(cfd[j], &ready_set))
read_channel(cfd[j], dfd[j], f);
exit(0);
}
/*
* So, we are reading one combined file. Just open it and
* read it forever (the function read_channel() will block)
* read it forever or nblocks if > 0; read_channel() is blocking.
*/
cfd[0] = open(argv[1], O_RDONLY);
if (cfd[0] < 0) {
......@@ -292,6 +307,10 @@ int main(int argc, char **argv)
strerror(errno));
exit(1);
}
while (1)
while (nblocks) {
read_channel(cfd[0], cfd[0], f);
if (nblocks > 0)
nblocks--;
}
return 0;
}
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