The option "-d -" makes blkparse dump traces as binary data to
standard output. Blktrace provides a similar capability.
This allows to pipe binary trace data from blkparse to another
tool which does online processing, like I/O statistics.
Signed-off-by: Martin Peschke <mp3@xxxxxxxxxx>
---
blkparse.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
--- a/blkparse.c
+++ b/blkparse.c
@@ -274,6 +274,7 @@ int data_is_native = -1;
static FILE *dump_fp;
static char *dump_binary;
+static int dump_binary_stdout = 0;
static unsigned int t_alloc_cache;
static unsigned int bit_alloc_cache;
@@ -307,6 +308,8 @@ static void output_binary(void *buf, int
fclose(dump_fp);
dump_binary = NULL;
}
+ if (dump_binary_stdout)
+ fflush(dump_fp);
}
}
@@ -2823,14 +2826,24 @@ int main(int argc, char *argv[])
}
if (dump_binary) {
- dump_fp = fopen(dump_binary, "w");
+ int mode, vbuf_size;
+ if (!strcmp(dump_binary, "-")) {
+ dump_fp = fdopen(STDOUT_FILENO, "w");
+ mode = _IOLBF;
+ vbuf_size = 4096;
+ dump_binary_stdout = 1;
+ } else {
+ dump_fp = fopen(dump_binary, "w");
+ mode = _IOFBF;
+ vbuf_size = 128 * 1024;
+ }
if (!dump_fp) {
perror(dump_binary);
dump_binary = NULL;
return 1;
}
bin_ofp_buffer = malloc(128 * 1024);
- if (setvbuf(dump_fp, bin_ofp_buffer, _IOFBF, 128 * 1024)) {
+ if (setvbuf(dump_fp, bin_ofp_buffer, mode, vbuf_size)) {
perror("setvbuf binary");
return 1;
}
--
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