Removed proc dependancies for init and free (which maintaining exactly
the same functionality). /proc takes up 90k of kernel space, so it is nice to avoid using it at all costs. The only places where it is depended on is for cetain optional mount/umount features, and for ps and lsmod. -Erik
This commit is contained in:
Erik Andersen
parent
fa4718efcf
commit
d07ee46919
32
free.c
32
free.c
@ -23,15 +23,33 @@
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#include "internal.h"
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#include <stdio.h>
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#include <sys/sysinfo.h>
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#if ! defined BB_FEATURE_USE_PROCFS
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#error Sorry, I depend on the /proc filesystem right now.
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#endif
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#define DIVISOR 1024
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extern int free_main(int argc, char **argv)
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{
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char *cmd[] = { "cat", "/proc/meminfo", "\0" };
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struct sysinfo info;
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sysinfo(&info);
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info.totalram/=DIVISOR;
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info.freeram/=DIVISOR;
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info.totalswap/=DIVISOR;
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info.freeswap/=DIVISOR;
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info.sharedram/=DIVISOR;
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info.bufferram/=DIVISOR;
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exit(cat_main(3, cmd));
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printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
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"shared", "buffers");
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printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
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info.totalram-info.freeram, info.freeram,
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info.sharedram, info.bufferram);
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printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
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info.totalswap-info.freeswap, info.freeswap);
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printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
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(info.totalram-info.freeram)+(info.totalswap-info.freeswap),
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info.freeram+info.freeswap);
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exit(TRUE);
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}
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44
init.c
44
init.c
@ -49,15 +49,12 @@
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#include <linux/serial.h> /* for serial_struct */
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#include <sys/vt.h> /* for vt_stat */
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#include <sys/ioctl.h>
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#include <sys/sysinfo.h> /* For check_free_memory() */
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#include <linux/version.h>
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#ifdef BB_SYSLOGD
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#include <sys/syslog.h>
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#endif
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#if ! defined BB_FEATURE_USE_PROCFS
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#error Sorry, I depend on the /proc filesystem right now.
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#endif
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#ifndef KERNEL_VERSION
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#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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#endif
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@ -226,25 +223,18 @@ void set_term(int fd)
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}
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/* How much memory does this machine have? */
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static int mem_total()
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static int check_free_memory()
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{
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char s[80];
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char *p = "/proc/meminfo";
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FILE *f;
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const char pattern[] = "MemTotal:";
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struct sysinfo info;
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if ((f = fopen(p, "r")) < 0) {
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message(LOG, "Error opening %s: %s\n", p, strerror(errno));
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sysinfo(&info);
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if (sysinfo(&info) != 0) {
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message(LOG, "Error checking free memory: %s\n", strerror(errno));
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return -1;
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}
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while (NULL != fgets(s, 79, f)) {
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p = strstr(s, pattern);
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if (NULL != p) {
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fclose(f);
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return (atoi(p + strlen(pattern)));
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}
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}
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return -1;
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return(info.freeram/1024);
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}
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static void console_init()
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@ -454,13 +444,13 @@ static void check_memory()
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{
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struct stat statBuf;
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if (mem_total() > 3500)
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if (check_free_memory() > 1000)
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return;
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if (stat("/etc/fstab", &statBuf) == 0) {
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/* Try to turn on swap */
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system("/sbin/swapon -a");
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if (mem_total() < 3500)
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if (check_free_memory() < 1000)
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goto goodnight;
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} else
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goto goodnight;
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@ -555,6 +545,11 @@ static void reboot_signal(int sig)
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}
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#if defined BB_FEATURE_INIT_CHROOT
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#if ! defined BB_FEATURE_USE_PROCFS
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#error Sorry, I depend on the /proc filesystem right now.
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#endif
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static void check_chroot(int sig)
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{
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char *argv_init[2] = { "init", NULL, };
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@ -853,13 +848,6 @@ extern int init_main(int argc, char **argv)
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#endif
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/* Mount /proc */
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if (mount("proc", "/proc", "proc", 0, 0) == 0) {
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message(LOG, "Mounting /proc: done.\n");
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kernelVersion = get_kernel_revision();
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} else
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message(LOG | CONSOLE, "Mounting /proc: failed!\n");
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/* Make sure there is enough memory to do something useful. */
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check_memory();
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44
init/init.c
44
init/init.c
@ -49,15 +49,12 @@
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#include <linux/serial.h> /* for serial_struct */
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#include <sys/vt.h> /* for vt_stat */
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#include <sys/ioctl.h>
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#include <sys/sysinfo.h> /* For check_free_memory() */
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#include <linux/version.h>
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#ifdef BB_SYSLOGD
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#include <sys/syslog.h>
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#endif
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#if ! defined BB_FEATURE_USE_PROCFS
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#error Sorry, I depend on the /proc filesystem right now.
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#endif
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#ifndef KERNEL_VERSION
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#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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#endif
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@ -226,25 +223,18 @@ void set_term(int fd)
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}
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/* How much memory does this machine have? */
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static int mem_total()
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static int check_free_memory()
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{
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char s[80];
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char *p = "/proc/meminfo";
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FILE *f;
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const char pattern[] = "MemTotal:";
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struct sysinfo info;
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if ((f = fopen(p, "r")) < 0) {
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message(LOG, "Error opening %s: %s\n", p, strerror(errno));
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sysinfo(&info);
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if (sysinfo(&info) != 0) {
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message(LOG, "Error checking free memory: %s\n", strerror(errno));
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return -1;
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}
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while (NULL != fgets(s, 79, f)) {
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p = strstr(s, pattern);
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if (NULL != p) {
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fclose(f);
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return (atoi(p + strlen(pattern)));
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}
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}
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return -1;
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return(info.freeram/1024);
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}
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static void console_init()
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@ -454,13 +444,13 @@ static void check_memory()
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{
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struct stat statBuf;
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if (mem_total() > 3500)
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if (check_free_memory() > 1000)
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return;
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if (stat("/etc/fstab", &statBuf) == 0) {
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/* Try to turn on swap */
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system("/sbin/swapon -a");
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if (mem_total() < 3500)
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if (check_free_memory() < 1000)
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goto goodnight;
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} else
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goto goodnight;
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@ -555,6 +545,11 @@ static void reboot_signal(int sig)
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}
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#if defined BB_FEATURE_INIT_CHROOT
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#if ! defined BB_FEATURE_USE_PROCFS
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#error Sorry, I depend on the /proc filesystem right now.
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#endif
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static void check_chroot(int sig)
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{
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char *argv_init[2] = { "init", NULL, };
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@ -853,13 +848,6 @@ extern int init_main(int argc, char **argv)
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#endif
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/* Mount /proc */
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if (mount("proc", "/proc", "proc", 0, 0) == 0) {
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message(LOG, "Mounting /proc: done.\n");
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kernelVersion = get_kernel_revision();
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} else
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message(LOG | CONSOLE, "Mounting /proc: failed!\n");
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/* Make sure there is enough memory to do something useful. */
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check_memory();
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@ -23,15 +23,33 @@
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#include "internal.h"
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#include <stdio.h>
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#include <sys/sysinfo.h>
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#if ! defined BB_FEATURE_USE_PROCFS
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#error Sorry, I depend on the /proc filesystem right now.
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#endif
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#define DIVISOR 1024
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extern int free_main(int argc, char **argv)
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{
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char *cmd[] = { "cat", "/proc/meminfo", "\0" };
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struct sysinfo info;
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sysinfo(&info);
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info.totalram/=DIVISOR;
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info.freeram/=DIVISOR;
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info.totalswap/=DIVISOR;
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info.freeswap/=DIVISOR;
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info.sharedram/=DIVISOR;
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info.bufferram/=DIVISOR;
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exit(cat_main(3, cmd));
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printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
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"shared", "buffers");
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printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
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info.totalram-info.freeram, info.freeram,
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info.sharedram, info.bufferram);
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printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
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info.totalswap-info.freeswap, info.freeswap);
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printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
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(info.totalram-info.freeram)+(info.totalswap-info.freeswap),
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info.freeram+info.freeswap);
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exit(TRUE);
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}
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15
utility.c
15
utility.c
@ -48,6 +48,7 @@
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/param.h> /* for PATH_MAX */
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#include <sys/utsname.h> /* for uname(2) */
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#if defined BB_FEATURE_MOUNT_LOOP
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#include <fcntl.h>
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@ -103,26 +104,20 @@ extern void fatalError(char *s, ...)
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}
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#if defined (BB_INIT) || defined (BB_PS)
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#if ! defined BB_FEATURE_USE_PROCFS
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#error Sorry, I depend on the /proc filesystem right now.
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#endif
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/* Returns kernel version encoded as major*65536 + minor*256 + patch,
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* so, for example, to check if the kernel is greater than 2.2.11:
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* if (get_kernel_revision() <= 2*65536+2*256+11) { <stuff> }
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*/
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int get_kernel_revision()
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{
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FILE *file;
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struct utsname name;
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int major = 0, minor = 0, patch = 0;
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file = fopen("/proc/sys/kernel/osrelease", "r");
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if (file == NULL) {
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/* bummer, /proc must not be mounted... */
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if (uname(&name) == -1) {
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perror("cannot get system information");
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return (0);
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}
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fscanf(file, "%d.%d.%d", &major, &minor, &patch);
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fclose(file);
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sscanf(name.version, "%d.%d.%d", &major, &minor, &patch);
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return major * 65536 + minor * 256 + patch;
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}
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#endif /* BB_INIT || BB_PS */
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