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Subject[tip:perf/urgent] perf annotate: Use pipe + fork instead of popen
Commit-ID:  9955d0be161a9baa241ae7b98426a4c705cb21cb
Gitweb: http://git.kernel.org/tip/9955d0be161a9baa241ae7b98426a4c705cb21cb
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Wed, 15 Jun 2016 15:48:08 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 29 Jul 2016 11:12:39 -0300

perf annotate: Use pipe + fork instead of popen

We will need to redirect the stderr as well, so open code popen as
a starting point.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-k0zt9svg4bswiglem7ornts4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/annotate.c | 39 +++++++++++++++++++++++++++++++++++----
1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index e9825fe..2dd396a 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1134,8 +1134,10 @@ int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
char symfs_filename[PATH_MAX];
struct kcore_extract kce;
bool delete_extract = false;
+ int stdout_fd[2];
int lineno = 0;
int nline;
+ pid_t pid;

if (filename)
symbol__join_symfs(symfs_filename, filename);
@@ -1258,9 +1260,32 @@ fallback:

pr_debug("Executing: %s\n", command);

- file = popen(command, "r");
+ err = -1;
+ if (pipe(stdout_fd) < 0) {
+ pr_err("Failure creating the pipe to run %s\n", command);
+ goto out_remove_tmp;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ pr_err("Failure forking to run %s\n", command);
+ goto out_close_stdout;
+ }
+
+ if (pid == 0) {
+ close(stdout_fd[0]);
+ dup2(stdout_fd[1], 1);
+ close(stdout_fd[1]);
+ execl("/bin/sh", "sh", "-c", command, NULL);
+ perror(command);
+ exit(-1);
+ }
+
+ close(stdout_fd[1]);
+
+ file = fdopen(stdout_fd[0], "r");
if (!file) {
- pr_err("Failure running %s\n", command);
+ pr_err("Failure creating FILE stream for %s\n", command);
/*
* If we were using debug info should retry with
* original binary.
@@ -1286,9 +1311,11 @@ fallback:
if (dso__is_kcore(dso))
delete_last_nop(sym);

- pclose(file);
-
+ fclose(file);
+ err = 0;
out_remove_tmp:
+ close(stdout_fd[0]);
+
if (dso__needs_decompress(dso))
unlink(symfs_filename);
out_free_filename:
@@ -1297,6 +1324,10 @@ out_free_filename:
if (free_filename)
free(filename);
return err;
+
+out_close_stdout:
+ close(stdout_fd[1]);
+ goto out_remove_tmp;
}

static void insert_source_line(struct rb_root *root, struct source_line *src_line)
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