[PATCH v3 06/15] perf header: add struct feat_fd for write

From: David Carrillo-Cisneros
Date: Tue Jun 06 2017 - 03:10:15 EST

Introduce struct feat_fd. This patch uses it as a wrapper
around fd in write_* functions for feature headers. Next
patches will extend its functionality to other feature
header functions.

This patch does not change behavior.

Signed-off-by: David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
---
tools/perf/util/build-id.c | 8 +-
tools/perf/util/build-id.h | 4 +-
tools/perf/util/header.c | 230 ++++++++++++++++++++++++---------------------
tools/perf/util/header.h | 7 +-
4 files changed, 138 insertions(+), 111 deletions(-)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 84d2ea51e557..292e90db3924 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -330,7 +330,7 @@ bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size)
else

static int write_buildid(const char *name, size_t name_len, u8 *build_id,
- pid_t pid, u16 misc, int fd)
+ pid_t pid, u16 misc, struct feat_fd *fd)
{
int err;
struct build_id_event b;
@@ -352,7 +352,8 @@ static int write_buildid(const char *name, size_t name_len, u8 *build_id,
return write_padded(fd, name, name_len + 1, len);
}

-static int machine__write_buildid_table(struct machine *machine, int fd)
+static int machine__write_buildid_table(struct machine *machine,
+ struct feat_fd *fd)
{
int err = 0;
char nm[PATH_MAX];
@@ -397,7 +398,8 @@ static int machine__write_buildid_table(struct machine *machine, int fd)
return err;
}

-int perf_session__write_buildid_table(struct perf_session *session, int fd)
+int perf_session__write_buildid_table(struct perf_session *session,
+ struct feat_fd *fd)
{
struct rb_node *nd;
int err = machine__write_buildid_table(&session->machines.host, fd);
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index 8a89b195c1fc..1f5121e8cc6b 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -9,6 +9,7 @@

extern struct perf_tool build_id__mark_dso_hit_ops;
struct dso;
+struct feat_fd;

int build_id__sprintf(const u8 *build_id, int len, char *bf);
int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id);
@@ -26,7 +27,8 @@ int build_id__mark_dso_hit(struct perf_tool *tool, union perf_event *event,
int dsos__hit_all(struct perf_session *session);

bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
-int perf_session__write_buildid_table(struct perf_session *session, int fd);
+int perf_session__write_buildid_table(struct perf_session *session,
+ struct feat_fd *fd);
int perf_session__cache_build_ids(struct perf_session *session);

char *build_id_cache__origname(const char *sbuild_id);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 1c75355bf568..99451d4fd332 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -58,6 +58,11 @@ struct perf_file_attr {
struct perf_file_section ids;
};

+struct feat_fd {
+ struct perf_header *ph;
+ int fd;
+};
+
void perf_header__set_feat(struct perf_header *header, int feat)
{
set_bit(feat, header->adds_features);
@@ -74,11 +79,11 @@ bool perf_header__has_feat(const struct perf_header *header, int feat)
}

/* Return: 0 if succeded, -ERR if failed. */
-int do_write(int fd, const void *buf, size_t size)
+int do_write(struct feat_fd *ff, const void *buf, size_t size)
{
ssize_t ret;

- ret = writen(fd, buf, size);
+ ret = writen(ff->fd, buf, size);
if (ret != (ssize_t)size)
return ret < 0 ? (int)ret: -1;

@@ -86,13 +91,14 @@ int do_write(int fd, const void *buf, size_t size)
}

/* Return: 0 if succeded, -ERR if failed. */
-int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
+int write_padded(struct feat_fd *ff, const void *bf,
+ size_t count, size_t count_aligned)
{
static const char zero_buf[NAME_ALIGN];
- int err = do_write(fd, bf, count);
+ int err = do_write(ff, bf, count);

if (!err)
- err = do_write(fd, zero_buf, count_aligned - count);
+ err = do_write(ff, zero_buf, count_aligned - count);

return err;
}
@@ -101,7 +107,7 @@ int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
(PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))

/* Return: 0 if succeded, -ERR if failed. */
-static int do_write_string(int fd, const char *str)
+static int do_write_string(struct feat_fd *ff, const char *str)
{
u32 len, olen;
int ret;
@@ -110,11 +116,11 @@ static int do_write_string(int fd, const char *str)
len = PERF_ALIGN(olen, NAME_ALIGN);

/* write len, incl. \0 */
- ret = do_write(fd, &len, sizeof(len));
+ ret = do_write(ff, &len, sizeof(len));
if (ret < 0)
return ret;

- return write_padded(fd, str, olen, len);
+ return write_padded(ff, str, olen, len);
}

static int __do_read(int fd, void *addr, ssize_t size)
@@ -177,25 +183,24 @@ static char *do_read_string(int fd, struct perf_header *ph)
return NULL;
}

-static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist)
+static int write_tracing_data(struct feat_fd *ff,
+ struct perf_evlist *evlist)
{
- return read_tracing_data(fd, &evlist->entries);
+ return read_tracing_data(ff->fd, &evlist->entries);
}

-
-static int write_build_id(int fd, struct perf_header *h,
+static int write_build_id(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
struct perf_session *session;
int err;

- session = container_of(h, struct perf_session, header);
+ session = container_of(ff->ph, struct perf_session, header);

if (!perf_session__read_build_ids(session, true))
return -1;

- err = perf_session__write_buildid_table(session, fd);
+ err = perf_session__write_buildid_table(session, ff);
if (err < 0) {
pr_debug("failed to write buildid table\n");
return err;
@@ -205,7 +210,7 @@ static int write_build_id(int fd, struct perf_header *h,
return 0;
}

-static int write_hostname(int fd, struct perf_header *h __maybe_unused,
+static int write_hostname(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
struct utsname uts;
@@ -215,10 +220,10 @@ static int write_hostname(int fd, struct perf_header *h __maybe_unused,
if (ret < 0)
return -1;

- return do_write_string(fd, uts.nodename);
+ return do_write_string(ff, uts.nodename);
}

-static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
+static int write_osrelease(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
struct utsname uts;
@@ -228,10 +233,10 @@ static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
if (ret < 0)
return -1;

- return do_write_string(fd, uts.release);
+ return do_write_string(ff, uts.release);
}

-static int write_arch(int fd, struct perf_header *h __maybe_unused,
+static int write_arch(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
struct utsname uts;
@@ -241,16 +246,16 @@ static int write_arch(int fd, struct perf_header *h __maybe_unused,
if (ret < 0)
return -1;

- return do_write_string(fd, uts.machine);
+ return do_write_string(ff, uts.machine);
}

-static int write_version(int fd, struct perf_header *h __maybe_unused,
+static int write_version(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
- return do_write_string(fd, perf_version_string);
+ return do_write_string(ff, perf_version_string);
}

-static int __write_cpudesc(int fd, const char *cpuinfo_proc)
+static int __write_cpudesc(struct feat_fd *ff, const char *cpuinfo_proc)
{
FILE *file;
char *buf = NULL;
@@ -300,14 +305,14 @@ static int __write_cpudesc(int fd, const char *cpuinfo_proc)
}
p++;
}
- ret = do_write_string(fd, s);
+ ret = do_write_string(ff, s);
done:
free(buf);
fclose(file);
return ret;
}

-static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
+static int write_cpudesc(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
#ifndef CPUINFO_PROC
@@ -318,7 +323,7 @@ static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,

for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
int ret;
- ret = __write_cpudesc(fd, cpuinfo_procs[i]);
+ ret = __write_cpudesc(ff, cpuinfo_procs[i]);
if (ret >= 0)
return ret;
}
@@ -326,7 +331,7 @@ static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
}


-static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
+static int write_nrcpus(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
long nr;
@@ -341,14 +346,14 @@ static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,

nra = (u32)(nr & UINT_MAX);

- ret = do_write(fd, &nrc, sizeof(nrc));
+ ret = do_write(ff, &nrc, sizeof(nrc));
if (ret < 0)
return ret;

- return do_write(fd, &nra, sizeof(nra));
+ return do_write(ff, &nra, sizeof(nra));
}

-static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
+static int write_event_desc(struct feat_fd *ff,
struct perf_evlist *evlist)
{
struct perf_evsel *evsel;
@@ -360,7 +365,7 @@ static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
/*
* write number of events
*/
- ret = do_write(fd, &nre, sizeof(nre));
+ ret = do_write(ff, &nre, sizeof(nre));
if (ret < 0)
return ret;

@@ -368,12 +373,12 @@ static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
* size of perf_event_attr struct
*/
sz = (u32)sizeof(evsel->attr);
- ret = do_write(fd, &sz, sizeof(sz));
+ ret = do_write(ff, &sz, sizeof(sz));
if (ret < 0)
return ret;

evlist__for_each_entry(evlist, evsel) {
- ret = do_write(fd, &evsel->attr, sz);
+ ret = do_write(ff, &evsel->attr, sz);
if (ret < 0)
return ret;
/*
@@ -384,27 +389,27 @@ static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
* type of ids,
*/
nri = evsel->ids;
- ret = do_write(fd, &nri, sizeof(nri));
+ ret = do_write(ff, &nri, sizeof(nri));
if (ret < 0)
return ret;

/*
* write event string as passed on cmdline
*/
- ret = do_write_string(fd, perf_evsel__name(evsel));
+ ret = do_write_string(ff, perf_evsel__name(evsel));
if (ret < 0)
return ret;
/*
* write unique ids for this event
*/
- ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
+ ret = do_write(ff, evsel->id, evsel->ids * sizeof(u64));
if (ret < 0)
return ret;
}
return 0;
}

-static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
+static int write_cmdline(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
char buf[MAXPATHLEN];
@@ -422,16 +427,16 @@ static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
/* account for binary path */
n = perf_env.nr_cmdline + 1;

- ret = do_write(fd, &n, sizeof(n));
+ ret = do_write(ff, &n, sizeof(n));
if (ret < 0)
return ret;

- ret = do_write_string(fd, buf);
+ ret = do_write_string(ff, buf);
if (ret < 0)
return ret;

for (i = 0 ; i < perf_env.nr_cmdline; i++) {
- ret = do_write_string(fd, perf_env.cmdline_argv[i]);
+ ret = do_write_string(ff, perf_env.cmdline_argv[i]);
if (ret < 0)
return ret;
}
@@ -584,8 +589,8 @@ static struct cpu_topo *build_cpu_topology(void)
return tp;
}

-static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist __maybe_unused)
+static int write_cpu_topology(struct feat_fd *ff,
+ struct perf_evlist *evlist __maybe_unused)
{
struct cpu_topo *tp;
u32 i;
@@ -595,21 +600,21 @@ static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
if (!tp)
return -1;

- ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
+ ret = do_write(ff, &tp->core_sib, sizeof(tp->core_sib));
if (ret < 0)
goto done;

for (i = 0; i < tp->core_sib; i++) {
- ret = do_write_string(fd, tp->core_siblings[i]);
+ ret = do_write_string(ff, tp->core_siblings[i]);
if (ret < 0)
goto done;
}
- ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
+ ret = do_write(ff, &tp->thread_sib, sizeof(tp->thread_sib));
if (ret < 0)
goto done;

for (i = 0; i < tp->thread_sib; i++) {
- ret = do_write_string(fd, tp->thread_siblings[i]);
+ ret = do_write_string(ff, tp->thread_siblings[i]);
if (ret < 0)
break;
}
@@ -619,11 +624,11 @@ static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
goto done;

for (j = 0; j < perf_env.nr_cpus_avail; j++) {
- ret = do_write(fd, &perf_env.cpu[j].core_id,
+ ret = do_write(ff, &perf_env.cpu[j].core_id,
sizeof(perf_env.cpu[j].core_id));
if (ret < 0)
return ret;
- ret = do_write(fd, &perf_env.cpu[j].socket_id,
+ ret = do_write(ff, &perf_env.cpu[j].socket_id,
sizeof(perf_env.cpu[j].socket_id));
if (ret < 0)
return ret;
@@ -635,8 +640,8 @@ static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,



-static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist __maybe_unused)
+static int write_total_mem(struct feat_fd *ff,
+ struct perf_evlist *evlist __maybe_unused)
{
char *buf = NULL;
FILE *fp;
@@ -656,7 +661,7 @@ static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
if (!ret) {
n = sscanf(buf, "%*s %"PRIu64, &mem);
if (n == 1)
- ret = do_write(fd, &mem, sizeof(mem));
+ ret = do_write(ff, &mem, sizeof(mem));
} else
ret = -1;
free(buf);
@@ -664,7 +669,7 @@ static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
return ret;
}

-static int write_topo_node(int fd, int node)
+static int write_topo_node(struct feat_fd *ff, int node)
{
char str[MAXPATHLEN];
char field[32];
@@ -694,11 +699,11 @@ static int write_topo_node(int fd, int node)
fclose(fp);
fp = NULL;

- ret = do_write(fd, &mem_total, sizeof(u64));
+ ret = do_write(ff, &mem_total, sizeof(u64));
if (ret)
goto done;

- ret = do_write(fd, &mem_free, sizeof(u64));
+ ret = do_write(ff, &mem_free, sizeof(u64));
if (ret)
goto done;

@@ -716,7 +721,7 @@ static int write_topo_node(int fd, int node)
if (p)
*p = '\0';

- ret = do_write_string(fd, buf);
+ ret = do_write_string(ff, buf);
done:
free(buf);
if (fp)
@@ -724,8 +729,8 @@ static int write_topo_node(int fd, int node)
return ret;
}

-static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist __maybe_unused)
+static int write_numa_topology(struct feat_fd *ff,
+ struct perf_evlist *evlist __maybe_unused)
{
char *buf = NULL;
size_t len = 0;
@@ -752,17 +757,17 @@ static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,

nr = (u32)node_map->nr;

- ret = do_write(fd, &nr, sizeof(nr));
+ ret = do_write(ff, &nr, sizeof(nr));
if (ret < 0)
goto done;

for (i = 0; i < nr; i++) {
j = (u32)node_map->map[i];
- ret = do_write(fd, &j, sizeof(j));
+ ret = do_write(ff, &j, sizeof(j));
if (ret < 0)
break;

- ret = write_topo_node(fd, i);
+ ret = write_topo_node(ff, i);
if (ret < 0)
break;
}
@@ -785,16 +790,16 @@ static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
* };
*/

-static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
+static int write_pmu_mappings(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
struct perf_pmu *pmu = NULL;
- off_t offset = lseek(fd, 0, SEEK_CUR);
+ off_t offset = lseek(ff->fd, 0, SEEK_CUR);
__u32 pmu_num = 0;
int ret;

/* write real pmu_num later */
- ret = do_write(fd, &pmu_num, sizeof(pmu_num));
+ ret = do_write(ff, &pmu_num, sizeof(pmu_num));
if (ret < 0)
return ret;

@@ -803,18 +808,18 @@ static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
continue;
pmu_num++;

- ret = do_write(fd, &pmu->type, sizeof(pmu->type));
+ ret = do_write(ff, &pmu->type, sizeof(pmu->type));
if (ret < 0)
return ret;

- ret = do_write_string(fd, pmu->name);
+ ret = do_write_string(ff, pmu->name);
if (ret < 0)
return ret;
}

- if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
+ if (pwrite(ff->fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
/* discard all */
- lseek(fd, offset, SEEK_SET);
+ lseek(ff->fd, offset, SEEK_SET);
return -1;
}

@@ -833,14 +838,14 @@ static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
* }[nr_groups];
* };
*/
-static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
+static int write_group_desc(struct feat_fd *ff,
struct perf_evlist *evlist)
{
u32 nr_groups = evlist->nr_groups;
struct perf_evsel *evsel;
int ret;

- ret = do_write(fd, &nr_groups, sizeof(nr_groups));
+ ret = do_write(ff, &nr_groups, sizeof(nr_groups));
if (ret < 0)
return ret;

@@ -851,15 +856,15 @@ static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
u32 leader_idx = evsel->idx;
u32 nr_members = evsel->nr_members;

- ret = do_write_string(fd, name);
+ ret = do_write_string(ff, name);
if (ret < 0)
return ret;

- ret = do_write(fd, &leader_idx, sizeof(leader_idx));
+ ret = do_write(ff, &leader_idx, sizeof(leader_idx));
if (ret < 0)
return ret;

- ret = do_write(fd, &nr_members, sizeof(nr_members));
+ ret = do_write(ff, &nr_members, sizeof(nr_members));
if (ret < 0)
return ret;
}
@@ -876,7 +881,7 @@ int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)
return -1;
}

-static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
+static int write_cpuid(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
char buffer[64];
@@ -888,25 +893,24 @@ static int write_cpuid(int fd, struct perf_header *h __maybe_unused,

return -1;
write_it:
- return do_write_string(fd, buffer);
+ return do_write_string(ff, buffer);
}

-static int write_branch_stack(int fd __maybe_unused,
- struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist __maybe_unused)
+static int write_branch_stack(struct feat_fd *ff __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused)
{
return 0;
}

-static int write_auxtrace(int fd, struct perf_header *h,
+static int write_auxtrace(struct feat_fd *ff,
struct perf_evlist *evlist __maybe_unused)
{
struct perf_session *session;
int err;

- session = container_of(h, struct perf_session, header);
+ session = container_of(ff->ph, struct perf_session, header);

- err = auxtrace_index__write(fd, &session->auxtrace_index);
+ err = auxtrace_index__write(ff->fd, &session->auxtrace_index);
if (err < 0)
pr_err("Failed to write auxtrace index\n");
return err;
@@ -1053,8 +1057,8 @@ static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)

#define MAX_CACHES 2000

-static int write_cache(int fd, struct perf_header *h __maybe_unused,
- struct perf_evlist *evlist __maybe_unused)
+static int write_cache(struct feat_fd *ff,
+ struct perf_evlist *evlist __maybe_unused)
{
struct cpu_cache_level caches[MAX_CACHES];
u32 cnt = 0, i, version = 1;
@@ -1066,11 +1070,11 @@ static int write_cache(int fd, struct perf_header *h __maybe_unused,

qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);

- ret = do_write(fd, &version, sizeof(u32));
+ ret = do_write(ff, &version, sizeof(u32));
if (ret < 0)
goto out;

- ret = do_write(fd, &cnt, sizeof(u32));
+ ret = do_write(ff, &cnt, sizeof(u32));
if (ret < 0)
goto out;

@@ -1078,7 +1082,7 @@ static int write_cache(int fd, struct perf_header *h __maybe_unused,
struct cpu_cache_level *c = &caches[i];

#define _W(v) \
- ret = do_write(fd, &c->v, sizeof(u32)); \
+ ret = do_write(ff, &c->v, sizeof(u32)); \
if (ret < 0) \
goto out;

@@ -1089,7 +1093,7 @@ static int write_cache(int fd, struct perf_header *h __maybe_unused,
#undef _W

#define _W(v) \
- ret = do_write_string(fd, (const char *) c->v); \
+ ret = do_write_string(ff, (const char *) c->v); \
if (ret < 0) \
goto out;

@@ -1105,8 +1109,7 @@ static int write_cache(int fd, struct perf_header *h __maybe_unused,
return ret;
}

-static int write_stat(int fd __maybe_unused,
- struct perf_header *h __maybe_unused,
+static int write_stat(struct feat_fd *ff __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
return 0;
@@ -2096,7 +2099,7 @@ static int process_cache(struct perf_file_section *section __maybe_unused,
}

struct feature_ops {
- int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
+ int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
void (*print)(struct perf_header *h, int fd, FILE *fp);
int (*process)(struct perf_file_section *section,
struct perf_header *h, int fd, void *data);
@@ -2205,29 +2208,29 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
return 0;
}

-static int do_write_feat(int fd, struct perf_header *h, int type,
+static int do_write_feat(struct feat_fd *ff, int type,
struct perf_file_section **p,
struct perf_evlist *evlist)
{
int err;
int ret = 0;

- if (perf_header__has_feat(h, type)) {
+ if (perf_header__has_feat(ff->ph, type)) {
if (!feat_ops[type].write)
return -1;

- (*p)->offset = lseek(fd, 0, SEEK_CUR);
+ (*p)->offset = lseek(ff->fd, 0, SEEK_CUR);

- err = feat_ops[type].write(fd, h, evlist);
+ err = feat_ops[type].write(ff, evlist);
if (err < 0) {
pr_debug("failed to write feature %s\n", feat_ops[type].name);

/* undo anything written */
- lseek(fd, (*p)->offset, SEEK_SET);
+ lseek(ff->fd, (*p)->offset, SEEK_SET);

return -1;
}
- (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
+ (*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;
(*p)++;
}
return ret;
@@ -2237,12 +2240,18 @@ static int perf_header__adds_write(struct perf_header *header,
struct perf_evlist *evlist, int fd)
{
int nr_sections;
+ struct feat_fd ff;
struct perf_file_section *feat_sec, *p;
int sec_size;
u64 sec_start;
int feat;
int err;

+ ff = (struct feat_fd){
+ .fd = fd,
+ .ph = header,
+ };
+
nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
@@ -2257,7 +2266,7 @@ static int perf_header__adds_write(struct perf_header *header,
lseek(fd, sec_start + sec_size, SEEK_SET);

for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
- if (do_write_feat(fd, header, feat, &p, evlist))
+ if (do_write_feat(&ff, feat, &p, evlist))
perf_header__clear_feat(header, feat);
}

@@ -2266,7 +2275,7 @@ static int perf_header__adds_write(struct perf_header *header,
* may write more than needed due to dropped feature, but
* this is okay, reader will skip the mising entries
*/
- err = do_write(fd, feat_sec, sec_size);
+ err = do_write(&ff, feat_sec, sec_size);
if (err < 0)
pr_debug("failed to write feature section\n");
free(feat_sec);
@@ -2276,14 +2285,17 @@ static int perf_header__adds_write(struct perf_header *header,
int perf_header__write_pipe(int fd)
{
struct perf_pipe_file_header f_header;
+ struct feat_fd ff;
int err;

+ ff = (struct feat_fd){ .fd = fd };
+
f_header = (struct perf_pipe_file_header){
.magic = PERF_MAGIC,
.size = sizeof(f_header),
};

- err = do_write(fd, &f_header, sizeof(f_header));
+ err = do_write(&ff, &f_header, sizeof(f_header));
if (err < 0) {
pr_debug("failed to write perf pipe header\n");
return err;
@@ -2300,21 +2312,23 @@ int perf_session__write_header(struct perf_session *session,
struct perf_file_attr f_attr;
struct perf_header *header = &session->header;
struct perf_evsel *evsel;
+ struct feat_fd ff;
u64 attr_offset;
int err;

+ ff = (struct feat_fd){ .fd = fd};
lseek(fd, sizeof(f_header), SEEK_SET);

evlist__for_each_entry(session->evlist, evsel) {
evsel->id_offset = lseek(fd, 0, SEEK_CUR);
- err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
+ err = do_write(&ff, evsel->id, evsel->ids * sizeof(u64));
if (err < 0) {
pr_debug("failed to write perf header\n");
return err;
}
}

- attr_offset = lseek(fd, 0, SEEK_CUR);
+ attr_offset = lseek(ff.fd, 0, SEEK_CUR);

evlist__for_each_entry(evlist, evsel) {
f_attr = (struct perf_file_attr){
@@ -2324,7 +2338,7 @@ int perf_session__write_header(struct perf_session *session,
.size = evsel->ids * sizeof(u64),
}
};
- err = do_write(fd, &f_attr, sizeof(f_attr));
+ err = do_write(&ff, &f_attr, sizeof(f_attr));
if (err < 0) {
pr_debug("failed to write perf header attribute\n");
return err;
@@ -2359,7 +2373,7 @@ int perf_session__write_header(struct perf_session *session,
memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));

lseek(fd, 0, SEEK_SET);
- err = do_write(fd, &f_header, sizeof(f_header));
+ err = do_write(&ff, &f_header, sizeof(f_header));
if (err < 0) {
pr_debug("failed to write perf header\n");
return err;
@@ -2634,6 +2648,10 @@ static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
struct perf_header *ph, int fd,
bool repipe)
{
+ struct feat_fd ff = {
+ .fd = STDOUT_FILENO,
+ .ph = ph,
+ };
ssize_t ret;

ret = readn(fd, header, sizeof(*header));
@@ -2648,7 +2666,7 @@ static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
if (ph->needs_swap)
header->size = bswap_64(header->size);

- if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
+ if (repipe && do_write(&ff, header, sizeof(*header)) < 0)
return -1;

return 0;
@@ -3156,6 +3174,7 @@ int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
union perf_event ev;
struct tracing_data *tdata;
ssize_t size = 0, aligned_size = 0, padding;
+ struct feat_fd ff;
int err __maybe_unused = 0;

/*
@@ -3190,7 +3209,8 @@ int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
*/
tracing_data_put(tdata);

- if (write_padded(fd, NULL, 0, padding))
+ ff = (struct feat_fd){ .fd = fd };
+ if (write_padded(&ff, NULL, 0, padding))
return -1;

return aligned_size;
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index e98489c8bba7..9d8dcd5eb727 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -144,9 +144,12 @@ bool is_perf_magic(u64 magic);

#define NAME_ALIGN 64

-int do_write(int fd, const void *buf, size_t size);
+struct feat_fd;

-int write_padded(int fd, const void *bf, size_t count, size_t count_aligned);
+int do_write(struct feat_fd *fd, const void *buf, size_t size);
+
+int write_padded(struct feat_fd *fd, const void *bf,
+ size_t count, size_t count_aligned);

/*
* arch specific callback
--
2.13.1.508.gb3defc5cc-goog