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Subject[PATCH 5/6] perf-probe: don't always consider EOF as an error when listing source code
Date
From: Franck Bui-Huu <fbuihuu@gmail.com>

When listing a whole file or a function which is located at the end,
perf-probe -L output wrongly: "Source file is shorter than expected.".

This is because show_one_line() always consider EOF as an error.

This patch fixes this by not considering EOF as an error when dumping
the trailing lines. Otherwise it's still an error and perf-probe still
outputs its warning.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
---
tools/perf/util/probe-event.c | 38 ++++++++++++++++++++++++++------------
1 files changed, 26 insertions(+), 12 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 8e5f5ff..1e81936 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -297,7 +297,7 @@ static int get_real_path(const char *raw_path, const char *comp_dir,
#define LINEBUF_SIZE 256
#define NR_ADDITIONAL_LINES 2

-static int show_one_line(FILE *fp, int l, bool skip, bool show_num)
+static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
{
char buf[LINEBUF_SIZE];
const char *color = show_num ? "" : PERF_COLOR_BLUE;
@@ -316,16 +316,30 @@ static int show_one_line(FILE *fp, int l, bool skip, bool show_num)

} while (strchr(buf, '\n') == NULL);

- return 0;
+ return 1;
error:
- if (feof(fp))
+ if (ferror(fp)) {
pr_warning("Source file is shorter than expected.\n");
- else
- pr_warning("File read error: %s\n", strerror(errno));
+ return -1;
+ }
+ return 0;
+}

- return -1;
+static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
+{
+ int rv = __show_one_line(fp, l, skip, show_num);
+ if (rv == 0) {
+ pr_warning("Source file is shorter than expected.\n");
+ rv = -1;
+ }
+ return rv;
}

+#define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
+#define show_one_line(f,l) _show_one_line(f,l,false,false)
+#define skip_one_line(f,l) _show_one_line(f,l,true,false)
+#define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
+
/*
* Show line-range always requires debuginfo to find source file and
* line number.
@@ -384,27 +398,27 @@ int show_line_range(struct line_range *lr, const char *module)
}
/* Skip to starting line number */
while (l < lr->start) {
- ret = show_one_line(fp, l++, true, false);
+ ret = skip_one_line(fp, l++);
if (ret < 0)
goto end;
}

list_for_each_entry(ln, &lr->line_list, list) {
for (; ln->line > l; l++) {
- ret = show_one_line(fp, l - lr->offset, false, false);
+ ret = show_one_line(fp, l - lr->offset);
if (ret < 0)
goto end;
}
- ret = show_one_line(fp, l++ - lr->offset, false, true);
+ ret = show_one_line_with_num(fp, l++ - lr->offset);
if (ret < 0)
goto end;
}

if (lr->end == INT_MAX)
lr->end = l + NR_ADDITIONAL_LINES;
- while (l <= lr->end && !feof(fp)) {
- ret = show_one_line(fp, l++ - lr->offset, false, false);
- if (ret < 0)
+ while (l <= lr->end) {
+ ret = show_one_line_or_eof(fp, l++ - lr->offset);
+ if (ret <= 0)
break;
}
end:
--
1.7.3.2


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