Hi! I recently wanted to quickly look at an optical disc without mounting it and since bsdtar/libarchive know iso9660 I just did the command in the Subject. It worked, but it was sloow... :( Apparently it read all of the disc without seeking. The following patch fixes this, is something like this desired? If yes I could look how to do the same for Linux, I _think_ there you could just check for S_ISBLK and try to lseek to the end and back, at least that seems to be how you find out the size of a block device there...
Cheers, Juergen Index: lib/libarchive/archive_read_open_filename.c @@ -44,6 +44,10 @@ #ifdef HAVE_UNISTD_H #include <unistd.h> #endif +#ifdef __FreeBSD__ +#include <sys/ioctl.h> +#include <sys/disk.h> +#endif #include "archive.h" @@ -83,6 +87,9 @@ struct read_file_data *mine; void *b; int fd; +#ifdef __FreeBSD__ + off_t mediasize = 0; +#endif archive_clear_error(a); if (filename == NULL || filename[0] == '\0') { @@ -143,6 +150,17 @@ */ mine->can_skip = 1; } +#ifdef __FreeBSD__ + /* + * on FreeBSD if a device supports the DIOCGMEDIASIZE ioctl + * it is a disk-like device and should be seekable. + */ + else if (S_ISCHR(st.st_mode) && + !ioctl(fd, DIOCGMEDIASIZE, &mediasize) && mediasize) { + archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino); + mine->can_skip = 1; + } +#endif return (archive_read_open2(a, mine, NULL, file_read, file_skip, file_close)); } _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"