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Date: Tue, 19 Mar 2013 17:53:42 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...nel.org>,
Namhyung Kim <namhyung.kim@....com>,
LKML <linux-kernel@...r.kernel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 7/9] perf util: Get rid of read_or_die() in trace-event-read.c
From: Namhyung Kim <namhyung.kim@....com>
Rename it to do_read and original do_read to __do_read, and check
their return value.
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/util/trace-event-read.c | 80 +++++++++++++++++++++++++++-----------
1 file changed, 57 insertions(+), 23 deletions(-)
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 62dd2168f4f5..87f0ccd54cdc 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -48,7 +48,7 @@ static int long_size;
static ssize_t calc_data_size;
static bool repipe;
-static int do_read(int fd, void *buf, int size)
+static int __do_read(int fd, void *buf, int size)
{
int rsize = size;
@@ -61,8 +61,10 @@ static int do_read(int fd, void *buf, int size)
if (repipe) {
int retw = write(STDOUT_FILENO, buf, ret);
- if (retw <= 0 || retw != ret)
- die("repiping input file");
+ if (retw <= 0 || retw != ret) {
+ pr_debug("repiping input file");
+ return -1;
+ }
}
size -= ret;
@@ -72,14 +74,16 @@ static int do_read(int fd, void *buf, int size)
return rsize;
}
-static int read_or_die(void *data, int size)
+static int do_read(void *data, int size)
{
int r;
- r = do_read(input_fd, data, size);
- if (r <= 0)
- die("reading input file (size expected=%d received=%d)",
- size, r);
+ r = __do_read(input_fd, data, size);
+ if (r <= 0) {
+ pr_debug("reading input file (size expected=%d received=%d)",
+ size, r);
+ return -1;
+ }
if (calc_data_size)
calc_data_size += r;
@@ -95,7 +99,7 @@ static void skip(int size)
while (size) {
r = size > BUFSIZ ? BUFSIZ : size;
- read_or_die(buf, r);
+ do_read(buf, r);
size -= r;
};
}
@@ -104,7 +108,8 @@ static unsigned int read4(struct pevent *pevent)
{
unsigned int data;
- read_or_die(&data, 4);
+ if (do_read(&data, 4) < 0)
+ return 0;
return __data2host4(pevent, data);
}
@@ -112,7 +117,8 @@ static unsigned long long read8(struct pevent *pevent)
{
unsigned long long data;
- read_or_die(&data, 8);
+ if (do_read(&data, 8) < 0)
+ return 0;
return __data2host8(pevent, data);
}
@@ -168,7 +174,10 @@ static int read_proc_kallsyms(struct pevent *pevent)
if (buf == NULL)
return -1;
- read_or_die(buf, size);
+ if (do_read(buf, size) < 0) {
+ free(buf);
+ return -1;
+ }
buf[size] = '\0';
parse_proc_kallsyms(pevent, buf, size);
@@ -182,6 +191,7 @@ static int read_ftrace_printk(struct pevent *pevent)
unsigned int size;
char *buf;
+ /* it can have 0 size */
size = read4(pevent);
if (!size)
return 0;
@@ -190,7 +200,10 @@ static int read_ftrace_printk(struct pevent *pevent)
if (buf == NULL)
return -1;
- read_or_die(buf, size);
+ if (do_read(buf, size) < 0) {
+ free(buf);
+ return -1;
+ }
parse_ftrace_printk(pevent, buf, size);
@@ -203,8 +216,10 @@ static int read_header_files(struct pevent *pevent)
unsigned long long size;
char *header_event;
char buf[BUFSIZ];
+ int ret = 0;
- read_or_die(buf, 12);
+ if (do_read(buf, 12) < 0)
+ return -1;
if (memcmp(buf, "header_page", 12) != 0)
die("did not read header page");
@@ -218,7 +233,9 @@ static int read_header_files(struct pevent *pevent)
*/
long_size = header_page_size_size;
- read_or_die(buf, 13);
+ if (do_read(buf, 13) < 0)
+ return -1;
+
if (memcmp(buf, "header_event", 13) != 0)
die("did not read header event");
@@ -227,9 +244,11 @@ static int read_header_files(struct pevent *pevent)
if (header_event == NULL)
return -1;
- read_or_die(header_event, size);
+ if (do_read(header_event, size) < 0)
+ ret = -1;
+
free(header_event);
- return 0;
+ return ret;
}
static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
@@ -240,7 +259,11 @@ static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
if (buf == NULL)
return -1;
- read_or_die(buf, size);
+ if (do_read(buf, size) < 0) {
+ free(buf);
+ return -1;
+ }
+
parse_ftrace_file(pevent, buf, size);
free(buf);
return 0;
@@ -255,7 +278,11 @@ static int read_event_file(struct pevent *pevent, char *sys,
if (buf == NULL)
return -1;
- read_or_die(buf, size);
+ if (do_read(buf, size) < 0) {
+ free(buf);
+ return -1;
+ }
+
parse_event_file(pevent, buf, size, sys);
free(buf);
return 0;
@@ -296,6 +323,7 @@ static int read_event_files(struct pevent *pevent)
return -1;
count = read4(pevent);
+
for (x=0; x < count; x++) {
size = read8(pevent);
ret = read_event_file(pevent, sys, size);
@@ -324,11 +352,13 @@ ssize_t trace_report(int fd, struct pevent **ppevent, bool __repipe)
input_fd = fd;
- read_or_die(buf, 3);
+ if (do_read(buf, 3) < 0)
+ return -1;
if (memcmp(buf, test, 3) != 0)
die("no trace data in the file");
- read_or_die(buf, 7);
+ if (do_read(buf, 7) < 0)
+ return -1;
if (memcmp(buf, "tracing", 7) != 0)
die("not a trace file (missing 'tracing' tag)");
@@ -339,7 +369,8 @@ ssize_t trace_report(int fd, struct pevent **ppevent, bool __repipe)
printf("version = %s\n", version);
free(version);
- read_or_die(buf, 1);
+ if (do_read(buf, 1) < 0)
+ return -1;
file_bigendian = buf[0];
host_bigendian = bigendian();
@@ -349,10 +380,13 @@ ssize_t trace_report(int fd, struct pevent **ppevent, bool __repipe)
goto out;
}
- read_or_die(buf, 1);
+ if (do_read(buf, 1) < 0)
+ goto out;
long_size = buf[0];
page_size = read4(pevent);
+ if (!page_size)
+ goto out;
if (read_header_files(pevent) ||
read_ftrace_files(pevent) ||
--
1.7.11.7
--
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