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#include <linux/kernel.h>
#include <unistd.h>
#include <sys/types.h>
#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);
}
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