181 lines
3.4 KiB
C
181 lines
3.4 KiB
C
#include <linux/compiler.h>
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#include <linux/kernel.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include "data.h"
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#include "util.h"
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#include "debug.h"
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static bool check_pipe(struct perf_data_file *file)
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{
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struct stat st;
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bool is_pipe = false;
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int fd = perf_data_file__is_read(file) ?
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STDIN_FILENO : STDOUT_FILENO;
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if (!file->path) {
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if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
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is_pipe = true;
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} else {
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if (!strcmp(file->path, "-"))
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is_pipe = true;
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}
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if (is_pipe)
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file->fd = fd;
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return file->is_pipe = is_pipe;
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}
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static int check_backup(struct perf_data_file *file)
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{
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struct stat st;
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if (!stat(file->path, &st) && st.st_size) {
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/* TODO check errors properly */
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char oldname[PATH_MAX];
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snprintf(oldname, sizeof(oldname), "%s.old",
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file->path);
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unlink(oldname);
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rename(file->path, oldname);
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}
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return 0;
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}
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static int open_file_read(struct perf_data_file *file)
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{
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struct stat st;
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int fd;
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char sbuf[STRERR_BUFSIZE];
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fd = open(file->path, O_RDONLY);
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if (fd < 0) {
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int err = errno;
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pr_err("failed to open %s: %s", file->path,
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str_error_r(err, sbuf, sizeof(sbuf)));
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if (err == ENOENT && !strcmp(file->path, "perf.data"))
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pr_err(" (try 'perf record' first)");
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pr_err("\n");
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return -err;
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}
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if (fstat(fd, &st) < 0)
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goto out_close;
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if (!file->force && st.st_uid && (st.st_uid != geteuid())) {
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pr_err("File %s not owned by current user or root (use -f to override)\n",
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file->path);
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goto out_close;
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}
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if (!st.st_size) {
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pr_info("zero-sized file (%s), nothing to do!\n",
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file->path);
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goto out_close;
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}
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file->size = st.st_size;
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return fd;
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out_close:
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close(fd);
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return -1;
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}
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static int open_file_write(struct perf_data_file *file)
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{
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int fd;
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char sbuf[STRERR_BUFSIZE];
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if (check_backup(file))
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return -1;
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fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
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if (fd < 0)
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pr_err("failed to open %s : %s\n", file->path,
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str_error_r(errno, sbuf, sizeof(sbuf)));
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return fd;
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}
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static int open_file(struct perf_data_file *file)
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{
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int fd;
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fd = perf_data_file__is_read(file) ?
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open_file_read(file) : open_file_write(file);
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file->fd = fd;
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return fd < 0 ? -1 : 0;
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}
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int perf_data_file__open(struct perf_data_file *file)
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{
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if (check_pipe(file))
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return 0;
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if (!file->path)
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file->path = "perf.data";
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return open_file(file);
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}
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void perf_data_file__close(struct perf_data_file *file)
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{
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close(file->fd);
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}
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ssize_t perf_data_file__write(struct perf_data_file *file,
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void *buf, size_t size)
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{
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return writen(file->fd, buf, size);
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}
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int perf_data_file__switch(struct perf_data_file *file,
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const char *postfix,
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size_t pos, bool at_exit)
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{
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char *new_filepath;
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int ret;
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if (check_pipe(file))
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return -EINVAL;
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if (perf_data_file__is_read(file))
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return -EINVAL;
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if (asprintf(&new_filepath, "%s.%s", file->path, postfix) < 0)
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return -ENOMEM;
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/*
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* Only fire a warning, don't return error, continue fill
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* original file.
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*/
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if (rename(file->path, new_filepath))
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pr_warning("Failed to rename %s to %s\n", file->path, new_filepath);
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if (!at_exit) {
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close(file->fd);
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ret = perf_data_file__open(file);
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if (ret < 0)
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goto out;
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if (lseek(file->fd, pos, SEEK_SET) == (off_t)-1) {
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ret = -errno;
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pr_debug("Failed to lseek to %zu: %s",
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pos, strerror(errno));
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goto out;
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}
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}
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ret = file->fd;
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out:
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free(new_filepath);
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return ret;
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}
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