perf tools: Eliminate some more die() uses in library functions

This time in perf_header__adds_write, propagating the do_write
error returns.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1258649757-17554-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 54 insertions, 28 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e66c7bd4cc88..d5c81ebc0a84 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -176,7 +176,7 @@ static int do_write(int fd, const void *buf, size_t size)
                 int ret = write(fd, buf, size);
 
                 if (ret < 0)
-                        return -1;
+                        return -errno;
 
                 size -= ret;
                 buf += ret;
@@ -190,6 +190,7 @@ static int dsos__write_buildid_table(int fd)
         struct dso *pos;
 
         list_for_each_entry(pos, &dsos, node) {
+                int err;
                 struct build_id_event b;
                 size_t len;
 
@@ -200,33 +201,35 @@ static int dsos__write_buildid_table(int fd)
                 memset(&b, 0, sizeof(b));
                 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
                 b.header.size = sizeof(b) + len;
-                if (do_write(fd, &b, sizeof(b)) < 0 ||
-                    do_write(fd, pos->long_name, len) < 0)
-                        return -1;
+                err = do_write(fd, &b, sizeof(b));
+                if (err < 0)
+                        return err;
+                err = do_write(fd, pos->long_name, len);
+                if (err < 0)
+                        return err;
         }
 
         return 0;
 }
 
-static void
-perf_header__adds_write(struct perf_header *self, int fd)
+static int perf_header__adds_write(struct perf_header *self, int fd)
 {
         int nr_sections;
         struct perf_file_section *feat_sec;
         int sec_size;
         u64 sec_start;
-        int idx = 0;
+        int idx = 0, err;
 
         if (dsos__read_build_ids())
                 perf_header__set_feat(self, HEADER_BUILD_ID);
 
         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
         if (!nr_sections)
-                return;
+                return 0;
 
         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
-        if (!feat_sec)
-                die("No memory");
+        if (feat_sec == NULL)
+                return -ENOMEM;
 
         sec_size = sizeof(*feat_sec) * nr_sections;
 
@@ -258,23 +261,29 @@ perf_header__adds_write(struct perf_header *self, int fd)
 
                 /* Write build-ids */
                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
-                if (dsos__write_buildid_table(fd) < 0)
-                        die("failed to write buildid table");
+                err = dsos__write_buildid_table(fd);
+                if (err < 0) {
+                        pr_debug("failed to write buildid table\n");
+                        goto out_free;
+                }
                 buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
         }
 
         lseek(fd, sec_start, SEEK_SET);
-        if (do_write(fd, feat_sec, sec_size) < 0)
-                die("failed to write feature section");
+        err = do_write(fd, feat_sec, sec_size);
+        if (err < 0)
+                pr_debug("failed to write feature section\n");
+out_free:
         free(feat_sec);
+        return err;
 }
 
-void perf_header__write(struct perf_header *self, int fd, bool at_exit)
+int perf_header__write(struct perf_header *self, int fd, bool at_exit)
 {
         struct perf_file_header f_header;
         struct perf_file_attr   f_attr;
         struct perf_header_attr *attr;
-        int i;
+        int i, err;
 
         lseek(fd, sizeof(f_header), SEEK_SET);
 
@@ -283,8 +292,11 @@ 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);
-                if (do_write(fd, attr->id, attr->ids * sizeof(u64)) < 0)
-                        die("failed to write perf header");
+                err = do_write(fd, attr->id, attr->ids * sizeof(u64));
+                if (err < 0) {
+                        pr_debug("failed to write perf header\n");
+                        return err;
+                }
         }
 
 
@@ -300,20 +312,30 @@ void perf_header__write(struct perf_header *self, int fd, bool at_exit)
                                 .size   = attr->ids * sizeof(u64),
                         }
                 };
-                if (do_write(fd, &f_attr, sizeof(f_attr)) < 0)
-                        die("failed to write perf header attribute");
+                err = do_write(fd, &f_attr, sizeof(f_attr));
+                if (err < 0) {
+                        pr_debug("failed to write perf header attribute\n");
+                        return err;
+                }
         }
 
         self->event_offset = lseek(fd, 0, SEEK_CUR);
         self->event_size = event_count * sizeof(struct perf_trace_event_type);
-        if (events)
-                if (do_write(fd, events, self->event_size) < 0)
-                        die("failed to write perf header events");
+        if (events) {
+                err = do_write(fd, events, self->event_size);
+                if (err < 0) {
+                        pr_debug("failed to write perf header events\n");
+                        return err;
+                }
+        }
 
         self->data_offset = lseek(fd, 0, SEEK_CUR);
 
-        if (at_exit)
-                perf_header__adds_write(self, fd);
+        if (at_exit) {
+                err = perf_header__adds_write(self, fd);
+                if (err < 0)
+                        return err;
+        }
 
         f_header = (struct perf_file_header){
                 .magic     = PERF_MAGIC,
@@ -336,11 +358,15 @@ 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);
-        if (do_write(fd, &f_header, sizeof(f_header)) < 0)
-                die("failed to write perf header");
+        err = do_write(fd, &f_header, sizeof(f_header));
+        if (err < 0) {
+                pr_debug("failed to write perf header\n");
+                return err;
+        }
         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 
         self->frozen = 1;
+        return 0;
 }
 
 static void do_read(int fd, void *buf, size_t size)
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index dc8fedb066ab..d1dbe2b79c42 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -59,7 +59,7 @@ struct perf_header *perf_header__new(void);
 void perf_header__delete(struct perf_header *self);
 
 int perf_header__read(struct perf_header *self, int fd);
-void perf_header__write(struct perf_header *self, int fd, bool at_exit);
+int perf_header__write(struct perf_header *self, int fd, bool at_exit);
 
 int perf_header__add_attr(struct perf_header *self,
                           struct perf_header_attr *attr);