diff options
Diffstat (limited to 'libinstaller')
| -rw-r--r-- | libinstaller/syslxcom.c | 13 | ||||
| -rw-r--r-- | libinstaller/syslxcom.h | 1 |
2 files changed, 14 insertions, 0 deletions
diff --git a/libinstaller/syslxcom.c b/libinstaller/syslxcom.c index b176f6d7..1de85aa5 100644 --- a/libinstaller/syslxcom.c +++ b/libinstaller/syslxcom.c @@ -284,3 +284,16 @@ int sectmap(int fd, sector_t *sectors, int nsectors) return sectmap_fib(fd, sectors, nsectors); } + +/* + * SYSLINUX installs the string 'SYSLINUX' at offset 3 in the boot + * sector; this is consistent with FAT filesystems. Earlier versions + * would install the string "EXTLINUX" instead, handle both. + */ +int syslinux_already_installed(int dev_fd) +{ + char buffer[8]; + + xpread(dev_fd, buffer, 8, 3); + return !memcmp(buffer, "SYSLINUX", 8) || !memcmp(buffer, "EXTLINUX", 8); +} diff --git a/libinstaller/syslxcom.h b/libinstaller/syslxcom.h index 39ca09d3..bf186ca6 100644 --- a/libinstaller/syslxcom.h +++ b/libinstaller/syslxcom.h @@ -18,5 +18,6 @@ ssize_t xpwrite(int fd, const void *buf, size_t count, off_t offset); void clear_attributes(int fd); void set_attributes(int fd); int sectmap(int fd, sector_t *sectors, int nsectors); +int syslinux_already_installed(int dev_fd); #endif |