6a4d98d787
Adding perf_data_file__open interface to data object to open the perf.data file for both read and write. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1381847254-28809-3-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
120 lines
2.2 KiB
C
120 lines
2.2 KiB
C
#include <linux/compiler.h>
|
|
#include <linux/kernel.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
#include "data.h"
|
|
#include "util.h"
|
|
|
|
static bool check_pipe(struct perf_data_file *file)
|
|
{
|
|
struct stat st;
|
|
bool is_pipe = false;
|
|
int fd = perf_data_file__is_read(file) ?
|
|
STDIN_FILENO : STDOUT_FILENO;
|
|
|
|
if (!file->path) {
|
|
if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
|
|
is_pipe = true;
|
|
} else {
|
|
if (!strcmp(file->path, "-"))
|
|
is_pipe = true;
|
|
}
|
|
|
|
if (is_pipe)
|
|
file->fd = fd;
|
|
|
|
return file->is_pipe = is_pipe;
|
|
}
|
|
|
|
static int check_backup(struct perf_data_file *file)
|
|
{
|
|
struct stat st;
|
|
|
|
if (!stat(file->path, &st) && st.st_size) {
|
|
/* TODO check errors properly */
|
|
char oldname[PATH_MAX];
|
|
snprintf(oldname, sizeof(oldname), "%s.old",
|
|
file->path);
|
|
unlink(oldname);
|
|
rename(file->path, oldname);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int open_file_read(struct perf_data_file *file)
|
|
{
|
|
struct stat st;
|
|
int fd;
|
|
|
|
fd = open(file->path, O_RDONLY);
|
|
if (fd < 0) {
|
|
int err = errno;
|
|
|
|
pr_err("failed to open %s: %s", file->path, strerror(err));
|
|
if (err == ENOENT && !strcmp(file->path, "perf.data"))
|
|
pr_err(" (try 'perf record' first)");
|
|
pr_err("\n");
|
|
return -err;
|
|
}
|
|
|
|
if (fstat(fd, &st) < 0)
|
|
goto out_close;
|
|
|
|
if (!file->force && st.st_uid && (st.st_uid != geteuid())) {
|
|
pr_err("file %s not owned by current user or root\n",
|
|
file->path);
|
|
goto out_close;
|
|
}
|
|
|
|
if (!st.st_size) {
|
|
pr_info("zero-sized file (%s), nothing to do!\n",
|
|
file->path);
|
|
goto out_close;
|
|
}
|
|
|
|
file->size = st.st_size;
|
|
return fd;
|
|
|
|
out_close:
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
static int open_file_write(struct perf_data_file *file)
|
|
{
|
|
if (check_backup(file))
|
|
return -1;
|
|
|
|
return open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
|
|
}
|
|
|
|
static int open_file(struct perf_data_file *file)
|
|
{
|
|
int fd;
|
|
|
|
fd = perf_data_file__is_read(file) ?
|
|
open_file_read(file) : open_file_write(file);
|
|
|
|
file->fd = fd;
|
|
return fd < 0 ? -1 : 0;
|
|
}
|
|
|
|
int perf_data_file__open(struct perf_data_file *file)
|
|
{
|
|
if (check_pipe(file))
|
|
return 0;
|
|
|
|
if (!file->path)
|
|
file->path = "perf.data";
|
|
|
|
return open_file(file);
|
|
}
|
|
|
|
void perf_data_file__close(struct perf_data_file *file)
|
|
{
|
|
close(file->fd);
|
|
}
|