dmesg,klogd: make code more readable

libbb: explain why we declare klogctl
libbb: move defs around so that order makes more sense

include/libbb.h

@@ -26,7 +26,6 @@
 #include <stdarg.h>
 #include <stddef.h>
 #include <string.h>
-/* #include <strings.h> - said to be obsolete */
 #include <sys/poll.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
@@ -40,6 +39,12 @@
 #include <time.h>
 #include <unistd.h>
 #include <utime.h>
+/* Try to pull in PATH_MAX */
+#include <limits.h>
+#include <sys/param.h>
+#ifndef PATH_MAX
+#define PATH_MAX 256
+#endif
 
 #if ENABLE_SELINUX
 #include <selinux/selinux.h>
@@ -62,14 +67,37 @@
 #include "shadow_.h"
 #endif
 
-/* Try to pull in PATH_MAX */
+#if defined(__GLIBC__) && __GLIBC__ < 2
-#include <limits.h>
+int vdprintf(int d, const char *format, va_list ap);
-#include <sys/param.h>
-#ifndef PATH_MAX
-#define PATH_MAX 256
 #endif
+/* klogctl is in libc's klog.h, but we cheat and not #include that */
+int klogctl(int type, char *b, int len);
+/* This is declared here rather than #including <libgen.h> in order to avoid
+ * confusing the two versions of basename.  See the dirname/basename man page
+ * for details. */
+char *dirname(char *path);
+/* Include our own copy of struct sysinfo to avoid binary compatibility
+ * problems with Linux 2.4, which changed things.  Grumble, grumble. */
+struct sysinfo {
+	long uptime;			/* Seconds since boot */
+	unsigned long loads[3];		/* 1, 5, and 15 minute load averages */
+	unsigned long totalram;		/* Total usable main memory size */
+	unsigned long freeram;		/* Available memory size */
+	unsigned long sharedram;	/* Amount of shared memory */
+	unsigned long bufferram;	/* Memory used by buffers */
+	unsigned long totalswap;	/* Total swap space size */
+	unsigned long freeswap;		/* swap space still available */
+	unsigned short procs;		/* Number of current processes */
+	unsigned short pad;			/* Padding needed for m68k */
+	unsigned long totalhigh;	/* Total high memory size */
+	unsigned long freehigh;		/* Available high memory size */
+	unsigned int mem_unit;		/* Memory unit size in bytes */
+	char _f[20 - 2*sizeof(long) - sizeof(int)]; /* Padding: libc5 uses this.. */
+};
+int sysinfo(struct sysinfo* info);
 
-/* Tested to work correctly (IIRC :]) */
+
+/* Tested to work correctly with all int types (IIRC :]) */
 #define MAXINT(T) (T)( \
 	((T)-1) > 0 \
 	? (T)-1 \
@@ -83,7 +111,7 @@
 	)
 
 /* Large file support */
-/* Note that CONFIG_LFS forces bbox to be built with all common ops
+/* Note that CONFIG_LFS=y forces bbox to be built with all common ops
  * (stat, lseek etc) mapped to "largefile" variants by libc.
  * Practically it means that open() automatically has O_LARGEFILE added
  * and all filesize/file_offset parameters and struct members are "large"
@@ -167,7 +195,6 @@
 #endif
 #endif
 
-
 #if defined(__GLIBC__)
 /* glibc uses __errno_location() to get a ptr to errno */
 /* We can just memorize it once - no multithreading in busybox :) */
@@ -176,33 +203,6 @@ extern int *const bb_errno;
 #define errno (*bb_errno)
 #endif
 
-#if defined(__GLIBC__) && __GLIBC__ < 2
-int vdprintf(int d, const char *format, va_list ap);
-#endif
-// This is declared here rather than #including <libgen.h> in order to avoid
-// confusing the two versions of basename.  See the dirname/basename man page
-// for details.
-char *dirname(char *path);
-/* Include our own copy of struct sysinfo to avoid binary compatibility
- * problems with Linux 2.4, which changed things.  Grumble, grumble. */
-struct sysinfo {
-	long uptime;			/* Seconds since boot */
-	unsigned long loads[3];		/* 1, 5, and 15 minute load averages */
-	unsigned long totalram;		/* Total usable main memory size */
-	unsigned long freeram;		/* Available memory size */
-	unsigned long sharedram;	/* Amount of shared memory */
-	unsigned long bufferram;	/* Memory used by buffers */
-	unsigned long totalswap;	/* Total swap space size */
-	unsigned long freeswap;		/* swap space still available */
-	unsigned short procs;		/* Number of current processes */
-	unsigned short pad;			/* Padding needed for m68k */
-	unsigned long totalhigh;	/* Total high memory size */
-	unsigned long freehigh;		/* Available high memory size */
-	unsigned int mem_unit;		/* Memory unit size in bytes */
-	char _f[20-2*sizeof(long)-sizeof(int)];	/* Padding: libc5 uses this.. */
-};
-int sysinfo(struct sysinfo* info);
-
 unsigned long long monotonic_us(void);
 unsigned monotonic_sec(void);
 
@@ -788,7 +788,6 @@ extern int set_loop(char **devname, const char *file, unsigned long long offset)
 //TODO: pass buf pointer or return allocated buf (avoid statics)?
 char *bb_askpass(int timeout, const char * prompt);
 int bb_ask_confirmation(void);
-int klogctl(int type, char * b, int len);
 
 extern int bb_parse_mode(const char* s, mode_t* theMode);
 

sysklogd/klogd.c

@@ -24,16 +24,17 @@
 static void klogd_signal(int sig ATTRIBUTE_UNUSED)
 {
 	klogctl(7, NULL, 0);
-	klogctl(0, 0, 0);
+	klogctl(0, NULL, 0);
-	syslog(LOG_NOTICE, "Kernel log daemon exiting");
+	syslog(LOG_NOTICE, "klogd: exiting");
 	exit(EXIT_SUCCESS);
 }
 
-#define OPT_LEVEL        1
-#define OPT_FOREGROUND   2
-
-#define KLOGD_LOGBUF_SIZE BUFSIZ
 #define log_buffer bb_common_bufsiz1
+enum {
+	KLOGD_LOGBUF_SIZE = sizeof(log_buffer),
+	OPT_LEVEL      = (1 << 0),
+	OPT_FOREGROUND = (1 << 1),
+};
 
 int klogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int klogd_main(int argc, char **argv)

util-linux/dmesg.c

@@ -15,40 +15,48 @@
 int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int dmesg_main(int argc, char **argv)
 {
+	int len;
+	char *buf;
 	char *size, *level;
 	int flags = getopt32(argv, "cs:n:", &size, &level);
 
 	if (flags & 4) {
 		if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
 			bb_perror_msg_and_die("klogctl");
-	} else {
+		return EXIT_SUCCESS;
-		int len;
-		char *buf;
-
-		len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
-		buf = xmalloc(len);
-		len = klogctl(3 + (flags & 1), buf, len);
-		if (len < 0)
-			bb_perror_msg_and_die("klogctl");
-
-		// Skip <#> at the start of lines, and make sure we end with a newline.
-
-		if (ENABLE_FEATURE_DMESG_PRETTY) {
-			int last = '\n';
-			int in;
-
-			for (in = 0; in<len;) {
-				if (last == '\n' && buf[in] == '<') in += 3;
-				else bb_putchar(last = buf[in++]);
-			}
-			if (last != '\n') bb_putchar('\n');
-		} else {
-			write(1,buf,len);
-			if (len && buf[len-1]!='\n') bb_putchar('\n');
-		}
-
-		if (ENABLE_FEATURE_CLEAN_UP) free(buf);
 	}
 
-	return 0;
+	len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
+	buf = xmalloc(len);
+	len = klogctl(3 + (flags & 1), buf, len);
+	if (len < 0)
+		bb_perror_msg_and_die("klogctl");
+	if (len == 0)
+		return EXIT_SUCCESS;
+
+	/* Skip <#> at the start of lines, and make sure we end with a newline. */
+
+	if (ENABLE_FEATURE_DMESG_PRETTY) {
+		int last = '\n';
+		int in = 0;
+
+		do {
+			if (last == '\n' && buf[in] == '<')
+				in += 3;
+			else {
+				last = buf[in++];
+				bb_putchar(last);
+			}
+		} while (in < len);
+		if (last != '\n')
+			bb_putchar('\n');
+	} else {
+		full_write(STDOUT_FILENO, buf, len);
+		if (buf[len-1] != '\n')
+			bb_putchar('\n');
+	}
+
+	if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+
+	return EXIT_SUCCESS;
 }