perf trace: Beautify pipe2 'flags' arg

 4.234 (0.005 ms): fetchmail/3224 pipe2(fildes: 0x7fffc72bcee0, flags: CLOEXEC) = 0

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-9e1jz78i6q6e0xr9fsitqbpe@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index bf74217be22c87691169ab7f2a4c47ad699bec98..76d9427b4b91250101d429b3073c52c5427344b7 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -517,6 +517,29 @@ static size_t syscall_arg__scnprintf_eventfd_flags(char *bf, size_t size,
 
 #define SCA_EFD_FLAGS syscall_arg__scnprintf_eventfd_flags
 
+static size_t syscall_arg__scnprintf_pipe_flags(char *bf, size_t size,
+                                               struct syscall_arg *arg)
+{
+       int printed = 0, flags = arg->val;
+
+#define        P_FLAG(n) \
+       if (flags & O_##n) { \
+               printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
+               flags &= ~O_##n; \
+       }
+
+       P_FLAG(CLOEXEC);
+       P_FLAG(NONBLOCK);
+#undef P_FLAG
+
+       if (flags)
+               printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
+
+       return printed;
+}
+
+#define SCA_PIPE_FLAGS syscall_arg__scnprintf_pipe_flags
+
 static size_t syscall_arg__scnprintf_signum(char *bf, size_t size, struct syscall_arg *arg)
 {
        int sig = arg->val;
@@ -620,6 +643,8 @@ static struct syscall_fmt {
          .arg_scnprintf = { [2] = SCA_OPEN_FLAGS, /* flags */ }, },
        { .name     = "openat",     .errmsg = true,
          .arg_scnprintf = { [2] = SCA_OPEN_FLAGS, /* flags */ }, },
+       { .name     = "pipe2",      .errmsg = true,
+         .arg_scnprintf = { [1] = SCA_PIPE_FLAGS, /* flags */ }, },
        { .name     = "poll",       .errmsg = true, .timeout = true, },
        { .name     = "ppoll",      .errmsg = true, .timeout = true, },
        { .name     = "pread",      .errmsg = true, .alias = "pread64", },