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

5 files changed, 87 insertions, 80 deletions

diff --git a/free.c b/free.c
index b071354..78a36fe 100644
--- a/free.c
+++ b/free.c
@@ -23,15 +23,33 @@
 
 #include "internal.h"
 #include <stdio.h>
+#include <sys/sysinfo.h>
 
-
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
-#endif
-
+#define DIVISOR	1024
 extern int free_main(int argc, char **argv)
 {
-	char *cmd[] = { "cat", "/proc/meminfo", "\0" };
+	struct sysinfo info;
+	sysinfo(&info);
+	info.totalram/=DIVISOR;
+	info.freeram/=DIVISOR;
+	info.totalswap/=DIVISOR;
+	info.freeswap/=DIVISOR;
+	info.sharedram/=DIVISOR;
+	info.bufferram/=DIVISOR;
+
+
+	printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free", 
+			"shared", "buffers");
+
+	printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram, 
+			info.totalram-info.freeram, info.freeram, 
+			info.sharedram, info.bufferram);
+
+	printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
+			info.totalswap-info.freeswap, info.freeswap);
 
-	exit(cat_main(3, cmd));
+	printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
+			(info.totalram-info.freeram)+(info.totalswap-info.freeswap),
+			info.freeram+info.freeswap);
+	exit(TRUE);
 }
diff --git a/init.c b/init.c
index 4a19822..6ec8115 100644
--- a/init.c
+++ b/init.c
@@ -49,15 +49,12 @@
 #include <linux/serial.h>		/* for serial_struct */
 #include <sys/vt.h>				/* for vt_stat */
 #include <sys/ioctl.h>
+#include <sys/sysinfo.h>		/* For check_free_memory() */
 #include <linux/version.h>
 #ifdef BB_SYSLOGD
 #include <sys/syslog.h>
 #endif
 
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
-#endif
-
 #ifndef KERNEL_VERSION
 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
 #endif
@@ -226,25 +223,18 @@ void set_term(int fd)
 }
 
 /* How much memory does this machine have? */
-static int mem_total()
+static int check_free_memory()
 {
-	char s[80];
-	char *p = "/proc/meminfo";
-	FILE *f;
-	const char pattern[] = "MemTotal:";
+	struct sysinfo info;
 
-	if ((f = fopen(p, "r")) < 0) {
-		message(LOG, "Error opening %s: %s\n", p, strerror(errno));
+	sysinfo(&info);
+	if (sysinfo(&info) != 0) {
+		message(LOG, "Error checking free memory: %s\n", strerror(errno));
 		return -1;
 	}
-	while (NULL != fgets(s, 79, f)) {
-		p = strstr(s, pattern);
-		if (NULL != p) {
-			fclose(f);
-			return (atoi(p + strlen(pattern)));
-		}
-	}
-	return -1;
+
+	return(info.freeram/1024);
+
 }
 
 static void console_init()
@@ -454,13 +444,13 @@ static void check_memory()
 {
 	struct stat statBuf;
 
-	if (mem_total() > 3500)
+	if (check_free_memory() > 1000)
 		return;
 
 	if (stat("/etc/fstab", &statBuf) == 0) {
 		/* Try to turn on swap */
 		system("/sbin/swapon -a");
-		if (mem_total() < 3500)
+		if (check_free_memory() < 1000)
 			goto goodnight;
 	} else
 		goto goodnight;
@@ -555,6 +545,11 @@ static void reboot_signal(int sig)
 }
 
 #if defined BB_FEATURE_INIT_CHROOT
+
+#if ! defined BB_FEATURE_USE_PROCFS
+#error Sorry, I depend on the /proc filesystem right now.
+#endif
+
 static void check_chroot(int sig)
 {
 	char *argv_init[2] = { "init", NULL, };
@@ -853,13 +848,6 @@ extern int init_main(int argc, char **argv)
 #endif
 
 
-	/* Mount /proc */
-	if (mount("proc", "/proc", "proc", 0, 0) == 0) {
-		message(LOG, "Mounting /proc: done.\n");
-		kernelVersion = get_kernel_revision();
-	} else
-		message(LOG | CONSOLE, "Mounting /proc: failed!\n");
-
 	/* Make sure there is enough memory to do something useful. */
 	check_memory();
 
diff --git a/init/init.c b/init/init.c
index 4a19822..6ec8115 100644
--- a/init/init.c
+++ b/init/init.c
@@ -49,15 +49,12 @@
 #include <linux/serial.h>		/* for serial_struct */
 #include <sys/vt.h>				/* for vt_stat */
 #include <sys/ioctl.h>
+#include <sys/sysinfo.h>		/* For check_free_memory() */
 #include <linux/version.h>
 #ifdef BB_SYSLOGD
 #include <sys/syslog.h>
 #endif
 
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
-#endif
-
 #ifndef KERNEL_VERSION
 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
 #endif
@@ -226,25 +223,18 @@ void set_term(int fd)
 }
 
 /* How much memory does this machine have? */
-static int mem_total()
+static int check_free_memory()
 {
-	char s[80];
-	char *p = "/proc/meminfo";
-	FILE *f;
-	const char pattern[] = "MemTotal:";
+	struct sysinfo info;
 
-	if ((f = fopen(p, "r")) < 0) {
-		message(LOG, "Error opening %s: %s\n", p, strerror(errno));
+	sysinfo(&info);
+	if (sysinfo(&info) != 0) {
+		message(LOG, "Error checking free memory: %s\n", strerror(errno));
 		return -1;
 	}
-	while (NULL != fgets(s, 79, f)) {
-		p = strstr(s, pattern);
-		if (NULL != p) {
-			fclose(f);
-			return (atoi(p + strlen(pattern)));
-		}
-	}
-	return -1;
+
+	return(info.freeram/1024);
+
 }
 
 static void console_init()
@@ -454,13 +444,13 @@ static void check_memory()
 {
 	struct stat statBuf;
 
-	if (mem_total() > 3500)
+	if (check_free_memory() > 1000)
 		return;
 
 	if (stat("/etc/fstab", &statBuf) == 0) {
 		/* Try to turn on swap */
 		system("/sbin/swapon -a");
-		if (mem_total() < 3500)
+		if (check_free_memory() < 1000)
 			goto goodnight;
 	} else
 		goto goodnight;
@@ -555,6 +545,11 @@ static void reboot_signal(int sig)
 }
 
 #if defined BB_FEATURE_INIT_CHROOT
+
+#if ! defined BB_FEATURE_USE_PROCFS
+#error Sorry, I depend on the /proc filesystem right now.
+#endif
+
 static void check_chroot(int sig)
 {
 	char *argv_init[2] = { "init", NULL, };
@@ -853,13 +848,6 @@ extern int init_main(int argc, char **argv)
 #endif
 
 
-	/* Mount /proc */
-	if (mount("proc", "/proc", "proc", 0, 0) == 0) {
-		message(LOG, "Mounting /proc: done.\n");
-		kernelVersion = get_kernel_revision();
-	} else
-		message(LOG | CONSOLE, "Mounting /proc: failed!\n");
-
 	/* Make sure there is enough memory to do something useful. */
 	check_memory();
 
diff --git a/procps/free.c b/procps/free.c
index b071354..78a36fe 100644
--- a/procps/free.c
+++ b/procps/free.c
@@ -23,15 +23,33 @@
 
 #include "internal.h"
 #include <stdio.h>
+#include <sys/sysinfo.h>
 
-
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
-#endif
-
+#define DIVISOR	1024
 extern int free_main(int argc, char **argv)
 {
-	char *cmd[] = { "cat", "/proc/meminfo", "\0" };
+	struct sysinfo info;
+	sysinfo(&info);
+	info.totalram/=DIVISOR;
+	info.freeram/=DIVISOR;
+	info.totalswap/=DIVISOR;
+	info.freeswap/=DIVISOR;
+	info.sharedram/=DIVISOR;
+	info.bufferram/=DIVISOR;
+
+
+	printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free", 
+			"shared", "buffers");
+
+	printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram, 
+			info.totalram-info.freeram, info.freeram, 
+			info.sharedram, info.bufferram);
+
+	printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
+			info.totalswap-info.freeswap, info.freeswap);
 
-	exit(cat_main(3, cmd));
+	printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
+			(info.totalram-info.freeram)+(info.totalswap-info.freeswap),
+			info.freeram+info.freeswap);
+	exit(TRUE);
 }
diff --git a/utility.c b/utility.c
index 5bfed81..64598fa 100644
--- a/utility.c
+++ b/utility.c
@@ -48,6 +48,7 @@
 #include <unistd.h>
 #include <ctype.h>
 #include <sys/param.h>			/* for PATH_MAX */
+#include <sys/utsname.h>		/* for uname(2) */
 
 #if defined BB_FEATURE_MOUNT_LOOP
 #include <fcntl.h>
@@ -103,26 +104,20 @@ extern void fatalError(char *s, ...)
 }
 
 #if defined (BB_INIT) || defined (BB_PS)
-
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
-#endif
 /* Returns kernel version encoded as major*65536 + minor*256 + patch,
  * so, for example,  to check if the kernel is greater than 2.2.11:
  *	if (get_kernel_revision() <= 2*65536+2*256+11) { <stuff> }
  */
 int get_kernel_revision()
 {
-	FILE *file;
+	struct utsname name;
 	int major = 0, minor = 0, patch = 0;
 
-	file = fopen("/proc/sys/kernel/osrelease", "r");
-	if (file == NULL) {
-		/* bummer, /proc must not be mounted... */
+	if (uname(&name) == -1) {
+		perror("cannot get system information");
 		return (0);
 	}
-	fscanf(file, "%d.%d.%d", &major, &minor, &patch);
-	fclose(file);
+	sscanf(name.version, "%d.%d.%d", &major, &minor, &patch);
 	return major * 65536 + minor * 256 + patch;
 }
 #endif							/* BB_INIT || BB_PS */