diff options
Diffstat (limited to 'src/blkdev/blkdev.c')
| -rw-r--r-- | src/blkdev/blkdev.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/blkdev/blkdev.c b/src/blkdev/blkdev.c index ae9c8d1..d97a4b3 100644 --- a/src/blkdev/blkdev.c +++ b/src/blkdev/blkdev.c @@ -7,8 +7,11 @@ #include <sys/types.h> #include <sys/stat.h> #include <sys/ioctl.h> +#include <sys/sysmacros.h> #include <unistd.h> #include <stdint.h> +#include <stdio.h> +#include <limits.h> #ifdef HAVE_LINUX_HDREG_H #include <linux/hdreg.h> @@ -317,17 +320,37 @@ int blkdev_get_geometry(int fd, unsigned int *h, unsigned int *s) /* * Get start offset of partition */ -int blkdev_get_start(int fd, unsigned int *s) +int blkdev_get_start(int fd, dev_t rdev, unsigned long long *s) { +#ifdef __linux__ + { + char path[PATH_MAX]; + FILE *file; + int ret; + + snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/start", major(rdev), minor(rdev)); + file = fopen(path, "r"); + if (file) { + ret = fscanf(file, "%llu", s); + fclose(file); + if (ret == 1) + return 0; + } + } +#endif + #ifdef HDIO_GETGEO + { struct hd_geometry geometry; if (ioctl(fd, HDIO_GETGEO, &geometry) == 0) { *s = geometry.start; return 0; } + } #endif + (void)rdev; /* prevent unused parameter warning */ (void)fd; /* prevent unused parameter warning */ *s = 0; return -1; |