From 94c744b6c0c6c5802a85ebfebbec429ac5851f2b Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Fri, 11 Dec 2009 21:24:02 -0200 Subject: perf tools: Introduce perf_session class MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit That does all the initialization boilerplate, opening the file, reading the header, checking if it is valid, etc. And that will as well have the threads list, kmap (now) global variable, etc, so that we can handle two (or more) perf.data files describing sessions to compare. Signed-off-by: Arnaldo Carvalho de Melo Cc: Frédéric Weisbecker Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Paul Mackerras LKML-Reference: <1260573842-19720-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar --- tools/perf/util/session.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 tools/perf/util/session.c (limited to 'tools/perf/util/session.c') diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c new file mode 100644 index 000000000000..707ce1cb1621 --- /dev/null +++ b/tools/perf/util/session.c @@ -0,0 +1,80 @@ +#include + +#include +#include + +#include "session.h" +#include "util.h" + +static int perf_session__open(struct perf_session *self, bool force) +{ + struct stat input_stat; + + self->fd = open(self->filename, O_RDONLY); + if (self->fd < 0) { + pr_err("failed to open file: %s", self->filename); + if (!strcmp(self->filename, "perf.data")) + pr_err(" (try 'perf record' first)"); + pr_err("\n"); + return -errno; + } + + if (fstat(self->fd, &input_stat) < 0) + goto out_close; + + if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { + pr_err("file %s not owned by current user or root\n", + self->filename); + goto out_close; + } + + if (!input_stat.st_size) { + pr_info("zero-sized file (%s), nothing to do!\n", + self->filename); + goto out_close; + } + + if (perf_header__read(&self->header, self->fd) < 0) { + pr_err("incompatible file format"); + goto out_close; + } + + self->size = input_stat.st_size; + return 0; + +out_close: + close(self->fd); + self->fd = -1; + return -1; +} + +struct perf_session *perf_session__new(const char *filename, int mode, bool force) +{ + size_t len = strlen(filename) + 1; + struct perf_session *self = zalloc(sizeof(*self) + len); + + if (self == NULL) + goto out; + + if (perf_header__init(&self->header) < 0) + goto out_delete; + + memcpy(self->filename, filename, len); + + if (mode == O_RDONLY && perf_session__open(self, force) < 0) { + perf_session__delete(self); + self = NULL; + } +out: + return self; +out_delete: + free(self); + return NULL; +} + +void perf_session__delete(struct perf_session *self) +{ + perf_header__exit(&self->header); + close(self->fd); + free(self); +} -- cgit v1.2.3