git mv resume.c resumelib.c and the addition of a minimal resume.c,
which calls resume() from resumelib produces a small standalone resume.
happy to hear feedback on the needed kinit/Kbuild changes.
resulting resume bin is small:
ls -l /usr/lib/klibc/bin/resume
-rwxr-xr-x 1 root root 2904 2006-07-11 02:11 /usr/lib/klibc/bin/resume
it reduces busybox dependency of Debian initramfs-tools:
if [ -e /sys/power/resume ]; then
major_minor=$(ls -l ${resume} | awk '{printf "%d:%d", $5,
$6}')
echo $major_minor >/sys/power/resume
fi
as one could simply call
resume ${resume}
---
Kbuild | 12 +++++---
resume.c | 75 ++++++-----------------------------------------------
resumelib.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 100 insertions(+), 71 deletions(-)
diff --git a/usr/kinit/Kbuild b/usr/kinit/Kbuild
index 0000e89..7669ecb 100644
--- a/usr/kinit/Kbuild
+++ b/usr/kinit/Kbuild
@@ -2,19 +2,21 @@ #
# Kbuild file for kinit
#
-static-y := kinit
+static-y := kinit static/resume
kinit-y := kinit.o do_mounts.o ramdisk_load.o initrd.o
kinit-y += name_to_dev.o devname.o
kinit-y += getarg.o getintfile.o open.o readfile.o xpio.o
-kinit-y += do_mounts_md.o do_mounts_mtd.o nfsroot.o resume.o
+kinit-y += do_mounts_md.o do_mounts_mtd.o nfsroot.o resumelib.o
kinit-y += ipconfig/
kinit-y += nfsmount/
kinit-y += run-init/
kinit-y += fstype/
-shared-y := kinit.shared
+shared-y := kinit.shared shared/resume
kinit.shared-y := $(kinit-y)
+static/resume-y := resume.o resumelib.o getarg.o name_to_dev.o devname.o
+shared/resume-y := resume.o resumelib.o getarg.o name_to_dev.o devname.o
# Additional include paths files
KLIBCCFLAGS += -I$(srctree)/$(src)/ipconfig \
@@ -25,7 +27,7 @@ KLIBCCFLAGS += -I$(srctree)/$(src)/ipcon
# Cleaning
targets := kinit kinit.g kinit.shared kinit.shared.g
subdir- := ipconfig nfsmount run-init fstype
-
+clean-dirs := static shared
# install binary
-install-y := kinit kinit.shared
+install-y := kinit kinit.shared $(static-y)
diff --git a/usr/kinit/resume.c b/usr/kinit/resume.c
index 952af96..00e5405 100644
--- a/usr/kinit/resume.c
+++ b/usr/kinit/resume.c
@@ -4,81 +4,24 @@
* Handle resume from suspend-to-disk
*/
-#include <errno.h>
-#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include <sys/stat.h>
-#include <sys/sysmacros.h>
-#include <linux/config.h> /* For CONFIG_PM_STD_PARTITION */
-#include "kinit.h"
-#include "do_mounts.h"
#include "resume.h"
-#ifndef CONFIG_PM_STD_PARTITION
-# define CONFIG_PM_STD_PARTITION ""
-#endif
+char *progname;
-int do_resume(int argc, char *argv[])
+static __noreturn usage(void)
{
- const char *resume_file = CONFIG_PM_STD_PARTITION;
- const char *resume_arg;
-
- resume_arg = get_arg(argc, argv, "resume=");
- resume_file = resume_arg ? resume_arg : resume_file;
- /* No resume device specified */
- if (!resume_file[0])
- return 0;
-
- /* Fix: we either should consider reverting the device back to
- ordinary swap, or (better) put that code into swapon */
- /* Noresume requested */
- if (get_flag(argc, argv, "noresume"))
- return 0;
- return resume(resume_file);
+ fprintf(stderr, "Usage: %s /dev/<resumedevice>\n", progname);
+ exit(1);
}
-int resume(const char *resume_file)
+int main(int argc, char *argv[], char *envp[])
{
- char device_string[64];
- int powerfd = -1;
- dev_t resume_device;
- int len;
-
- resume_device = name_to_dev_t(resume_file);
-
- if (major(resume_device) == 0) {
- fprintf(stderr, "Invalid resume device: %s\n", resume_file);
- goto failure;
- }
-
- if ((powerfd = open("/sys/power/resume", O_WRONLY)) < 0)
- goto fail_r;
-
- len = snprintf(device_string, sizeof device_string, "%u:%u",
- major(resume_device), minor(resume_device));
-
- /* This should never happen */
- if (len >= sizeof device_string)
- goto fail_r;
-
- DEBUG(("kinit: trying to resume from %s\n", resume_file));
-
- if (write(powerfd, device_string, len) != len)
- goto fail_r;
-
- /* Okay, what are we still doing alive... */
-failure:
- if (powerfd >= 0)
- close(powerfd);
- fprintf(stderr, "Resume failed, doing normal boot...\n");
- return -1;
+ progname = argv[0];
+ if (argc != 2)
+ usage();
-fail_r:
- fprintf(stderr, "Cannot write /sys/power/resume "
- "(no software suspend kernel support?)\n");
- goto failure;
+ return resume(argv[1]);
}
diff --git a/usr/kinit/resumelib.c b/usr/kinit/resumelib.c
new file mode 100644
index 0000000..2683a5d
--- /dev/null
+++ b/usr/kinit/resumelib.c
@@ -0,0 +1,84 @@
+/*
+ * resumelib.c
+ *
+ * Handle resume from suspend-to-disk
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <linux/config.h> /* For CONFIG_PM_STD_PARTITION */
+
+#include "kinit.h"
+#include "do_mounts.h"
+#include "resume.h"
+
+#ifndef CONFIG_PM_STD_PARTITION
+# define CONFIG_PM_STD_PARTITION ""
+#endif
+
+int do_resume(int argc, char *argv[])
+{
+ const char *resume_file = CONFIG_PM_STD_PARTITION;
+ const char *resume_arg;
+
+ resume_arg = get_arg(argc, argv, "resume=");
+ resume_file = resume_arg ? resume_arg : resume_file;
+ /* No resume device specified */
+ if (!resume_file[0])
+ return 0;
+
+ /* Fix: we either should consider reverting the device back to
+ ordinary swap, or (better) put that code into swapon */
+ /* Noresume requested */
+ if (get_flag(argc, argv, "noresume"))
+ return 0;
+ return resume(resume_file);
+}
+
+int resume(const char *resume_file)
+{
+ char device_string[64];
+ int powerfd = -1;
+ dev_t resume_device;
+ int len;
+
+ resume_device = name_to_dev_t(resume_file);
+
+ if (major(resume_device) == 0) {
+ fprintf(stderr, "Invalid resume device: %s\n", resume_file);
+ goto failure;
+ }
+
+ if ((powerfd = open("/sys/power/resume", O_WRONLY)) < 0)
+ goto fail_r;
+
+ len = snprintf(device_string, sizeof device_string, "%u:%u",
+ major(resume_device), minor(resume_device));
+
+ /* This should never happen */
+ if (len >= sizeof device_string)
+ goto fail_r;
+
+ DEBUG(("kinit: trying to resume from %s\n", resume_file));
+
+ if (write(powerfd, device_string, len) != len)
+ goto fail_r;
+
+ /* Okay, what are we still doing alive... */
+failure:
+ if (powerfd >= 0)
+ close(powerfd);
+ fprintf(stderr, "Resume failed, doing normal boot...\n");
+ return -1;
+
+fail_r:
+ fprintf(stderr, "Cannot write /sys/power/resume "
+ "(no software suspend kernel support?)\n");
+ goto failure;
+}
--
maks
