commit 423e0020982122a7d7d4f5e2e2e62f0ba795de19
parent 92895baad07775a97cf69091d570836afa33a833
Author: sin <sin@2f30.org>
Date: Fri, 9 Aug 2013 13:45:20 +0100
Add mkswap(8)
No manpage yet.
Diffstat:
| M | Makefile | | | 1 | + |
| A | mkswap.c | | | 83 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 84 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -20,6 +20,7 @@ ifeq ($(OS),linux)
SRC += \
insmod.c \
lsmod.c \
+ mkswap.c \
rmmod.c
endif
diff --git a/mkswap.c b/mkswap.c
@@ -0,0 +1,83 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "util.h"
+
+enum { SWAP_UUID_LENGTH = 16, SWAP_LABEL_LENGTH = 16 };
+enum { SWAP_MIN_PAGES = 10 };
+
+struct swap_hdr {
+ char bootbits[1024];
+ unsigned int version;
+ unsigned int last_page;
+ unsigned int nr_badpages;
+ unsigned char uuid[SWAP_UUID_LENGTH];
+ char volume_name[SWAP_LABEL_LENGTH];
+ unsigned int padding[117];
+ unsigned int badpages[1];
+};
+
+static void
+usage(void)
+{
+ eprintf("usage: %s <filename|device>\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+ int fd;
+ unsigned int pages;
+ long pagesize;
+ struct stat sb;
+ char *buf;
+ struct swap_hdr *hdr;
+
+ ARGBEGIN {
+ default:
+ usage();
+ } ARGEND;
+
+ if (argc < 1)
+ usage();
+
+ pagesize = sysconf(_SC_PAGE_SIZE);
+
+ fd = open(argv[0], O_RDWR);
+ if (fd < 0)
+ eprintf("open %s:", argv[0]);
+ if (fstat(fd, &sb) < 0)
+ eprintf("stat %s:", argv[0]);
+
+ buf = calloc(1, pagesize);
+ if (!buf)
+ eprintf("malloc:");
+
+ pages = sb.st_size / pagesize;
+ if (pages < SWAP_MIN_PAGES)
+ enprintf(1, "swap space needs to be at least %ldKiB\n",
+ SWAP_MIN_PAGES * pagesize / 1024);
+
+ /* Fill up the swap header */
+ hdr = (struct swap_hdr *)buf;
+ hdr->version = 1;
+ hdr->last_page = pages - 1;
+ strncpy(buf + pagesize - 10, "SWAPSPACE2", 10);
+
+ printf("Setting up swapspace version 1, size = %luKiB\n",
+ (pages - 1) * pagesize / 1024);
+
+ /* Write out the signature page */
+ if (write(fd, buf, pagesize) != pagesize)
+ enprintf(1, "unable to write signature page\n");
+
+ fsync(fd);
+ close(fd);
+ free(buf);
+
+ return 0;
+}
