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Message-ID: <tip-4a31e56599d42c5ac17b280228349948dee352c7@git.kernel.org>
Date: Tue, 2 Apr 2013 02:29:56 -0700
From: tip-bot for Namhyung Kim <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
hpa@...or.com, mingo@...nel.org, a.p.zijlstra@...llo.nl,
namhyung.kim@....com, namhyung@...nel.org, fweisbec@...il.com,
rostedt@...dmis.org, tglx@...utronix.de
Subject: [tip:perf/core] perf tools: Get rid of read_or_die()
in trace-event-read.c
Commit-ID: 4a31e56599d42c5ac17b280228349948dee352c7
Gitweb: http://git.kernel.org/tip/4a31e56599d42c5ac17b280228349948dee352c7
Author: Namhyung Kim <namhyung.kim@....com>
AuthorDate: Thu, 21 Mar 2013 16:18:50 +0900
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 21 Mar 2013 13:34:13 -0300
perf tools: Get rid of read_or_die() in trace-event-read.c
Rename it to do_read and original do_read to __do_read, and check
their return value.
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/1363850332-25297-8-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
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 22ded80..877706b 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -46,7 +46,7 @@ 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;
@@ -59,8 +59,10 @@ 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;
@@ -70,14 +72,16 @@ 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;
@@ -93,7 +97,7 @@ static void skip(int size)
while (size) {
r = size > BUFSIZ ? BUFSIZ : size;
- read_or_die(buf, r);
+ do_read(buf, r);
size -= r;
};
}
@@ -102,7 +106,8 @@ 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);
}
@@ -110,7 +115,8 @@ 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);
}
@@ -166,7 +172,10 @@ 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);
@@ -180,6 +189,7 @@ 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;
@@ -188,7 +198,10 @@ 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);
@@ -201,8 +214,10 @@ 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");
@@ -216,7 +231,9 @@ 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");
@@ -225,9 +242,11 @@ 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)
@@ -238,7 +257,11 @@ 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;
@@ -253,7 +276,11 @@ 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;
@@ -294,6 +321,7 @@ 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);
@@ -323,11 +351,13 @@ 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)");
@@ -338,7 +368,8 @@ 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();
@@ -348,10 +379,13 @@ 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;
err = read_header_files(pevent);
if (err)
--
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