[PATCH 2/6] perf tools: Introduce struct perf_log

Namhyung Kim
2013-12-19T07:01:59Z

From: Namhyung Kim <namhyung.kim@lge.com>

Add new functions to save error messages in a temp file. It'll be
used by some UI front-ends to see the messages.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Makefile.perf | 1 +
tools/perf/perf.c | 3 ++
tools/perf/util/debug.h | 15 +++++++
tools/perf/util/log.c | 105 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 124 insertions(+)
create mode 100644 tools/perf/util/log.c

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 97a2145e4cc6..ec8184014a76 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -372,6 +372,7 @@ LIB_OBJS += $(OUTPUT)util/stat.o
LIB_OBJS += $(OUTPUT)util/record.o
LIB_OBJS += $(OUTPUT)util/srcline.o
LIB_OBJS += $(OUTPUT)util/data.o
+LIB_OBJS += $(OUTPUT)util/log.o

LIB_OBJS += $(OUTPUT)ui/setup.o
LIB_OBJS += $(OUTPUT)ui/helpline.o
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 431798a4110d..bdf7bd8e4394 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -10,6 +10,7 @@

#include "util/exec_cmd.h"
#include "util/cache.h"
+#include "util/debug.h"
#include "util/quote.h"
#include "util/run-command.h"
#include "util/parse-events.h"
@@ -524,6 +525,7 @@ int main(int argc, const char **argv)
*/
pthread__block_sigwinch();

+ perf_log_init();
while (1) {
static int done_help;
int was_alias = run_argv(&argc, &argv);
@@ -543,6 +545,7 @@ int main(int argc, const char **argv)
} else
break;
}
+ perf_log_exit();

fprintf(stderr, "Failed to run command '%s': %s\n",
cmd, strerror(errno));
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index 443694c36b03..ea160abc2ae0 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -19,4 +19,19 @@ int ui__warning(const char *format, ...) __attribute__((format(printf, 1, 2)));

void pr_stat(const char *fmt, ...);

+struct perf_log {
+ FILE *fp;
+ off_t *linemap;
+ u32 lines;
+ u32 nr_alloc;
+ bool seen_newline;
+};
+
+extern struct perf_log perf_log;
+
+int perf_log_init(void);
+int perf_log_exit(void);
+void perf_log_add(const char *msg);
+void perf_log_addv(const char *fmt, va_list ap);
+
#endif /* __PERF_DEBUG_H */
diff --git a/tools/perf/util/log.c b/tools/perf/util/log.c
new file mode 100644
index 000000000000..4a34bed2af44
--- /dev/null
+++ b/tools/perf/util/log.c
@@ -0,0 +1,105 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "util/debug.h"
+
+#define LINEMAP_GROW 128
+
+struct perf_log perf_log = {
+ .seen_newline = true,
+};
+
+int perf_log_init(void)
+{
+ FILE *fp;
+ char name[] = "/tmp/perf-tui-log-XXXXXX";
+ int fd = mkstemp(name);
+
+ if (fd < 0)
+ return -1;
+
+ fp = fdopen(fd, "r+");
+ if (fp == NULL) {
+ close(fd);
+ return -1;
+ }
+
+ perf_log.fp = fp;
+
+ return 0;
+}
+
+int perf_log_exit(void)
+{
+ FILE *fp = perf_log.fp;
+ if (fp)
+ fclose(fp);
+
+ free(perf_log.linemap);
+
+ perf_log.fp = NULL;
+ perf_log.linemap = NULL;
+ return 0;
+}
+
+static int grow_linemap(struct perf_log *log)
+{
+ off_t *newmap;
+ int newsize = log->nr_alloc + LINEMAP_GROW;
+
+ newmap = realloc(log->linemap, newsize * sizeof(*log->linemap));
+ if (newmap == NULL)
+ return -1;
+
+ log->nr_alloc = newsize;
+ log->linemap = newmap;
+ return 0;
+}
+
+static int __add_to_linemap(struct perf_log *log, off_t index)
+{
+ if (log->lines == log->nr_alloc)
+ if (grow_linemap(log) < 0)
+ return -1;
+
+ log->linemap[log->lines++] = index;
+ return 0;
+}
+
+static void add_to_linemap(struct perf_log *log, const char *msg, off_t base)
+{
+ const char *pos;
+
+ if (strlen(msg) == 0)
+ return;
+
+ if (log->seen_newline) {
+ if (__add_to_linemap(log, base) < 0)
+ return;
+ }
+
+ if ((pos = strchr(msg, '\n')) != NULL) {
+ log->seen_newline = true;
+ pos++;
+ add_to_linemap(log, pos, base + (pos - msg));
+ } else {
+ log->seen_newline = false;
+ }
+}
+
+void perf_log_add(const char *msg)
+{
+ FILE *fp = perf_log.fp;
+ off_t offset = ftello(fp);
+
+ add_to_linemap(&perf_log, msg, offset);
+
+ fwrite(msg, 1, strlen(msg), fp);
+}
+
+void perf_log_addv(const char *fmt, va_list ap)
+{
+ char buf[4096];
+
+ vsnprintf(buf, sizeof(buf), fmt, ap);
+ perf_log_add(buf);
+}
--
1.7.11.7