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2a525f6a55
When there is a need to modify only timestamps, it is much simpler and quicker to do it to the existing file rather than re-write all the contents. In preparation for that, add the ability to modify the input file in place. In practice that just means making the file descriptor and mmaps writable. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: https://lore.kernel.org/r/20210430070309.17624-5-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_DATA_H
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#define __PERF_DATA_H
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#include <stdio.h>
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#include <stdbool.h>
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enum perf_data_mode {
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PERF_DATA_MODE_WRITE,
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PERF_DATA_MODE_READ,
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};
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enum perf_dir_version {
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PERF_DIR_SINGLE_FILE = 0,
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PERF_DIR_VERSION = 1,
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};
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struct perf_data_file {
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char *path;
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union {
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int fd;
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FILE *fptr;
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};
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unsigned long size;
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};
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struct perf_data {
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const char *path;
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struct perf_data_file file;
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bool is_pipe;
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bool is_dir;
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bool force;
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bool use_stdio;
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bool in_place_update;
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enum perf_data_mode mode;
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struct {
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u64 version;
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struct perf_data_file *files;
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int nr;
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} dir;
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};
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static inline bool perf_data__is_read(struct perf_data *data)
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{
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return data->mode == PERF_DATA_MODE_READ;
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}
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static inline bool perf_data__is_write(struct perf_data *data)
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{
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return data->mode == PERF_DATA_MODE_WRITE;
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}
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static inline int perf_data__is_pipe(struct perf_data *data)
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{
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return data->is_pipe;
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}
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static inline bool perf_data__is_dir(struct perf_data *data)
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{
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return data->is_dir;
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}
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static inline bool perf_data__is_single_file(struct perf_data *data)
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{
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return data->dir.version == PERF_DIR_SINGLE_FILE;
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}
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static inline int perf_data__fd(struct perf_data *data)
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{
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if (data->use_stdio)
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return fileno(data->file.fptr);
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return data->file.fd;
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}
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int perf_data__open(struct perf_data *data);
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void perf_data__close(struct perf_data *data);
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ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size);
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ssize_t perf_data__write(struct perf_data *data,
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void *buf, size_t size);
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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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* If at_exit is set, only rename current perf.data to
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* perf.data.<postfix>, continue write on original data.
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* Set at_exit when flushing the last output.
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*
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* Return value is fd of new output.
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*/
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int perf_data__switch(struct perf_data *data,
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const char *postfix,
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size_t pos, bool at_exit, char **new_filepath);
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int perf_data__create_dir(struct perf_data *data, int nr);
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int perf_data__open_dir(struct perf_data *data);
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void perf_data__close_dir(struct perf_data *data);
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int perf_data__update_dir(struct perf_data *data);
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unsigned long perf_data__size(struct perf_data *data);
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int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz);
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char *perf_data__kallsyms_name(struct perf_data *data);
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bool is_perf_data(const char *path);
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#endif /* __PERF_DATA_H */
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