Add mkswap.

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 89c8781b..a5bf4755 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -266,6 +266,16 @@ void xwrite(int fd, void *buf, size_t len)
 	if (len != writeall(fd, buf, len)) perror_exit("xwrite");
 }
 
+// Die if lseek fails, probably due to being called on a pipe.
+
+off_t xlseek(int fd, off_t offset, int whence)
+{
+	offset = lseek(fd, offset, whence);
+	if (offset<0) perror_exit("lseek");
+
+	return offset;
+}
+
 char *xgetcwd(void)
 {
 	char *buf = getcwd(NULL, 0);