| #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 = filename ? strlen(filename) + 1 : 0; |
| 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); |
| self->threads = RB_ROOT; |
| self->last_match = NULL; |
| self->mmap_window = 32; |
| self->cwd = NULL; |
| self->cwdlen = 0; |
| |
| 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->cwd); |
| free(self); |
| } |