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76 lines
1.6 KiB
76 lines
1.6 KiB
//! Memory mapping abstraction
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#ifndef _MAP_H
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#define _MAP_H
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#include <stdbool.h>
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#include "ints.h"
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typedef enum mm_err {
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MAP_ERR_UNKNOWN = 0,
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MAP_SUCCESS = 1,
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MAP_ERR_MMAP,
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MAP_ERR_UNMAP,
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MAP_ERR_OPEN,
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MAP_ERR_CLOSE,
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MAP_ERR_STAT,
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MAP_ERR_ADVISE,
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} map_result_t;
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typedef union memory_map {
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// Common
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struct {
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union {
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void* origin;
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u8* area;
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};
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usize len;
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};
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// Specific to anon / file
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struct mm_file {
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void* origin;
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usize len;
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off_t fd_offset;
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int fd;
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} file;
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struct mm_anon {
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void* origin;
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usize len;
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} anon;
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} map_t;
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map_result_t map_fd(int fd, bool write, usize size, off_t offset, map_t *pOUT map);
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/// Specify size as 0 to use the file's full size for the map.
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map_result_t map_file(const char* file, bool write, usize size, off_t offset, map_t *pOUT map);
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map_result_t map_anon(void* ptr, usize len, map_t *pOUT map);
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map_result_t map_free(map_t map);
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map_result_t map_preload(map_t *pINOUT map, bool random);
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const char* map_error_str(map_result_t res);
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_mixin int _map_handle_err(const char* stmt, const char* file, int line, const char* func, map_result_t res)
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{
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if(res == MAP_SUCCESS) return 1;
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else COLD_BLOCK {
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const char* err = map_error_str(res);
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ERROR("mapping failed at %s:%d->%s(): on stmt `%s`", file, line, func, stmt);
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switch(res) {
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// Non-errno errors
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case MAP_ERR_UNKNOWN:
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case MAP_SUCCESS:
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fprintf(stderr, err);
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if(0)
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// errno errors
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default:
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perror(err);
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return 0;
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}
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}
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UNREACHABLE();
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}
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#define map_handle_err(stmt) _map_handle_err(#stmt, __FILE__, __LINE__, __func__, stmt)
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#endif /* _MAP_H */
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