perf record: Introduce special handling for pipe output

Adds special treatment for stdout - if the user specifies '-o -'
to perf record, the intent is that the event stream be written
to stdout rather than to a disk file.

Also, redirect stdout of forked child to stderr - in pipe mode,
stdout of the forked child interferes with the stdout perf
stream, so redirect it to stderr where it can still be seen but
won't be mixed in with the perf output.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: k-keiichi@bx.jp.nec.com
Cc: acme@ghostprotocols.net
LKML-Reference: <1270184365-8281-3-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 15 insertions, 3 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d060fc50c8a..d4464f7fcea 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -35,6 +35,7 @@ static unsigned int		page_size;
 static unsigned int             mmap_pages                      =    128;
 static int                      freq                            =   1000;
 static int                      output;
+static int                      pipe_output                     =      0;
 static const char               *output_name                    = "perf.data";
 static int                      group                           =      0;
 static unsigned int             realtime_prio                   =      0;
@@ -449,7 +450,9 @@ static int __cmd_record(int argc, const char **argv)
                 exit(-1);
         }
 
-        if (!stat(output_name, &st) && st.st_size) {
+        if (!strcmp(output_name, "-"))
+                pipe_output = 1;
+        else if (!stat(output_name, &st) && st.st_size) {
                 if (!force) {
                         if (!append_file) {
                                 pr_err("Error, output file %s exists, use -A "
@@ -474,7 +477,10 @@ static int __cmd_record(int argc, const char **argv)
         else
                 flags |= O_TRUNC;
 
-        output = open(output_name, flags, S_IRUSR|S_IWUSR);
+        if (pipe_output)
+                output = STDOUT_FILENO;
+        else
+                output = open(output_name, flags, S_IRUSR | S_IWUSR);
         if (output < 0) {
                 perror("failed to create output file");
                 exit(-1);
@@ -513,6 +519,8 @@ static int __cmd_record(int argc, const char **argv)
                 }
 
                 if (!child_pid) {
+                        if (pipe_output)
+                                dup2(2, 1);
                         close(child_ready_pipe[0]);
                         close(go_pipe[1]);
                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
@@ -564,7 +572,11 @@ static int __cmd_record(int argc, const char **argv)
                         open_counters(cpumap[i]);
         }
 
-        if (file_new) {
+        if (pipe_output) {
+                err = perf_header__write_pipe(output);
+                if (err < 0)
+                        return err;
+        } else if (file_new) {
                 err = perf_header__write(&session->header, output, false);
                 if (err < 0)
                         return err;