diff options
Diffstat (limited to 'man2/mmap.2')
| -rw-r--r-- | man2/mmap.2 | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/man2/mmap.2 b/man2/mmap.2 index 8b8e11b1a..3d8181ebb 100644 --- a/man2/mmap.2 +++ b/man2/mmap.2 @@ -941,10 +941,10 @@ to output the desired bytes. #include <sys/mman.h> #include <sys/stat.h> #include <unistd.h> - +\& #define handle_error(msg) \e do { perror(msg); exit(EXIT_FAILURE); } while (0) - +\& int main(int argc, char *argv[]) { @@ -954,55 +954,55 @@ main(int argc, char *argv[]) size_t length; ssize_t s; struct stat sb; - +\& if (argc < 3 || argc > 4) { fprintf(stderr, "%s file offset [length]\en", argv[0]); exit(EXIT_FAILURE); } - +\& fd = open(argv[1], O_RDONLY); if (fd == \-1) handle_error("open"); - +\& if (fstat(fd, &sb) == \-1) /* To obtain file size */ handle_error("fstat"); - +\& offset = atoi(argv[2]); pa_offset = offset & \[ti](sysconf(_SC_PAGE_SIZE) \- 1); /* offset for mmap() must be page aligned */ - +\& if (offset >= sb.st_size) { fprintf(stderr, "offset is past end of file\en"); exit(EXIT_FAILURE); } - +\& if (argc == 4) { length = atoi(argv[3]); if (offset + length > sb.st_size) length = sb.st_size \- offset; /* Can\[aq]t display bytes past end of file */ - +\& } else { /* No length arg ==> display to end of file */ length = sb.st_size \- offset; } - +\& addr = mmap(NULL, length + offset \- pa_offset, PROT_READ, MAP_PRIVATE, fd, pa_offset); if (addr == MAP_FAILED) handle_error("mmap"); - +\& s = write(STDOUT_FILENO, addr + offset \- pa_offset, length); if (s != length) { if (s == \-1) handle_error("write"); - +\& fprintf(stderr, "partial write"); exit(EXIT_FAILURE); } - +\& munmap(addr, length + offset \- pa_offset); close(fd); - +\& exit(EXIT_SUCCESS); } .EE |