linux-kernel - [PATCH 4/4] perf tools: Don't die() in do

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Date:	Tue, 17 Nov 2009 01:18:12 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 4/4] perf tools: Don't die() in do_write

From: Arnaldo Carvalho de Melo <acme@...hat.com>

Propagate the errors instead, the users are the ones to decide what
to do if a library call fails.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/header.c |   33 ++++++++++++++++++++++-----------
 1 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 726a0eb..b01a953 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -161,31 +161,36 @@ bool perf_header__has_feat(const struct perf_header *self, int feat)
 	return test_bit(feat, self->adds_features);
 }
 
-static void do_write(int fd, void *buf, size_t size)
+static int do_write(int fd, const void *buf, size_t size)
 {
 	while (size) {
 		int ret = write(fd, buf, size);
 
 		if (ret < 0)
-			die("failed to write");
+			return -1;
 
 		size -= ret;
 		buf += ret;
 	}
+
+	return 0;
 }
 
-static void write_buildid_table(int fd, struct list_head *id_head)
+static int write_buildid_table(int fd, struct list_head *id_head)
 {
 	struct build_id_list *iter, *next;
 
 	list_for_each_entry_safe(iter, next, id_head, list) {
 		struct build_id_event *b = &iter->event;
 
-		do_write(fd, b, sizeof(*b));
-		do_write(fd, (void *)iter->dso_name, iter->len);
+		if (do_write(fd, b, sizeof(*b)) < 0 ||
+		    do_write(fd, iter->dso_name, iter->len) < 0)
+			return -1;
 		list_del(&iter->list);
 		free(iter);
 	}
+
+	return 0;
 }
 
 static void
@@ -233,12 +238,14 @@ perf_header__adds_write(struct perf_header *self, int fd)
 
 		/* Write build-ids */
 		buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
-		write_buildid_table(fd, &id_list);
+		if (write_buildid_table(fd, &id_list) < 0)
+			die("failed to write buildid table");
 		buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
 	}
 
 	lseek(fd, sec_start, SEEK_SET);
-	do_write(fd, feat_sec, sec_size);
+	if (do_write(fd, feat_sec, sec_size) < 0)
+		die("failed to write feature section");
 	free(feat_sec);
 }
 
@@ -256,7 +263,8 @@ void perf_header__write(struct perf_header *self, int fd, bool at_exit)
 		attr = self->attr[i];
 
 		attr->id_offset = lseek(fd, 0, SEEK_CUR);
-		do_write(fd, attr->id, attr->ids * sizeof(u64));
+		if (do_write(fd, attr->id, attr->ids * sizeof(u64)) < 0)
+			die("failed to write perf header");
 	}
 
 
@@ -272,13 +280,15 @@ void perf_header__write(struct perf_header *self, int fd, bool at_exit)
 				.size   = attr->ids * sizeof(u64),
 			}
 		};
-		do_write(fd, &f_attr, sizeof(f_attr));
+		if (do_write(fd, &f_attr, sizeof(f_attr)) < 0)
+			die("failed to write perf header attribute");
 	}
 
 	self->event_offset = lseek(fd, 0, SEEK_CUR);
 	self->event_size = event_count * sizeof(struct perf_trace_event_type);
 	if (events)
-		do_write(fd, events, self->event_size);
+		if (do_write(fd, events, self->event_size) < 0)
+			die("failed to write perf header events");
 
 	self->data_offset = lseek(fd, 0, SEEK_CUR);
 
@@ -306,7 +316,8 @@ void perf_header__write(struct perf_header *self, int fd, bool at_exit)
 	memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 
 	lseek(fd, 0, SEEK_SET);
-	do_write(fd, &f_header, sizeof(f_header));
+	if (do_write(fd, &f_header, sizeof(f_header)) < 0)
+		die("failed to write perf header");
 	lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 
 	self->frozen = 1;
-- 
1.6.2.5

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