packio-simple
annotate src/memmap.c @ 2:4767e7769c32
packio-simple has more chances to ever get done
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 09 Aug 2015 05:14:29 +0300 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@2 | 1 #include <stdio.h> |
| nuclear@2 | 2 #include <string.h> |
| nuclear@2 | 3 #include <errno.h> |
| nuclear@2 | 4 #include "memmap.h" |
| nuclear@2 | 5 |
| nuclear@2 | 6 #if defined(__unix__) || defined(__APPLE__) |
| nuclear@2 | 7 #include <unistd.h> |
| nuclear@2 | 8 #include <fcntl.h> |
| nuclear@2 | 9 #include <sys/mman.h> |
| nuclear@2 | 10 #include <sys/stat.h> |
| nuclear@2 | 11 |
| nuclear@2 | 12 int map_file(struct mmfile *mm, const char *fname) |
| nuclear@2 | 13 { |
| nuclear@2 | 14 int fd; |
| nuclear@2 | 15 struct stat st; |
| nuclear@2 | 16 |
| nuclear@2 | 17 if((fd = open(fname, O_RDONLY)) == -1) { |
| nuclear@2 | 18 fprintf(stderr, "map_file: failed to open %s: %s\n", fname, strerror(errno)); |
| nuclear@2 | 19 return -1; |
| nuclear@2 | 20 } |
| nuclear@2 | 21 fstat(fd, &st); |
| nuclear@2 | 22 |
| nuclear@2 | 23 if((mm->ptr = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) == (void*)-1) { |
| nuclear@2 | 24 close(fd); |
| nuclear@2 | 25 fprintf(stderr, "map_file: failed to map file %s: %s\n", fname, strerror(errno)); |
| nuclear@2 | 26 return -1; |
| nuclear@2 | 27 } |
| nuclear@2 | 28 mm->size = st.st_size; |
| nuclear@2 | 29 |
| nuclear@2 | 30 close(fd); |
| nuclear@2 | 31 return 0; |
| nuclear@2 | 32 } |
| nuclear@2 | 33 |
| nuclear@2 | 34 void unmap_file(struct mmfile *mm) |
| nuclear@2 | 35 { |
| nuclear@2 | 36 munmap(mm->ptr, mm->size); |
| nuclear@2 | 37 } |
| nuclear@2 | 38 |
| nuclear@2 | 39 #else |
| nuclear@2 | 40 /* implement on win32 */ |
| nuclear@2 | 41 #endif |