From e400e3578e5852ee9c366c8206053e870bbb5e72 Mon Sep 17 00:00:00 2001
From: Daniel Roskams <rocket.penguin@riseup.net>
Date: Sat, 1 Oct 2016 21:47:19 +0800
Subject: [PATCH] Document kernelinfo(1).

---
 utils/Makefile     |  1 +
 utils/kernelinfo.1 | 36 ++++++++++++++++++++++++++++++++++++
 utils/kernelinfo.c | 38 +++++++-------------------------------
 3 files changed, 44 insertions(+), 31 deletions(-)
 create mode 100644 utils/kernelinfo.1

diff --git a/utils/Makefile b/utils/Makefile
index b54909a7..dc091981 100644
--- a/utils/Makefile
+++ b/utils/Makefile
@@ -75,6 +75,7 @@ xinstall
 
 MANPAGES=\
 chkblayout.1 \
+kernelinfo.1 \
 readlink.1 \
 
 all: $(BINARIES)
diff --git a/utils/kernelinfo.1 b/utils/kernelinfo.1
new file mode 100644
index 00000000..ab28fb82
--- /dev/null
+++ b/utils/kernelinfo.1
@@ -0,0 +1,36 @@
+.Dd October 01, 2016
+.Dt KERNELINFO 1
+.Os
+.Sh NAME
+.Nm kernelinfo
+.Nd print kernel information
+.Sh SYNOPSIS
+.Nm
+.Op Ar variable ...
+.Sh DESCRIPTION
+.Nm
+prints the specified kernel information.
+.Pp
+Possible values for
+.Ar variable
+are:
+.Bl -tag -width builddate
+.It Sy name
+The name of the current kernel.
+.It Sy version
+The version of the current kernel.
+.It Sy tagline
+The tagline (slogan) of the release.
+.It Sy builddate
+The date on which the current kernel was built.
+.It Sy buildtime
+The time at which the current kernel was built.
+.It Sy firmware
+The firmware of the system (e.g. "bios" or "uefi")
+.El
+.Sh EXIT STATUS
+.Nm
+will exit 0 on success and non-zero otherwise.
+.Sh SEE ALSO
+.Xr uname 1 ,
+.Xr kernelinfo 2
diff --git a/utils/kernelinfo.c b/utils/kernelinfo.c
index 32d08c29..fd4af4d5 100644
--- a/utils/kernelinfo.c
+++ b/utils/kernelinfo.c
@@ -18,30 +18,16 @@
  */
 
 #include <sys/kernelinfo.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
+
+#include <err.h>
 #include <errno.h>
 #include <error.h>
-
-static void help(FILE* fp, const char* argv0)
-{
-	fprintf(fp, "Usage: %s [OPTION]... REQUEST...\n", argv0);
-	fprintf(fp, "Prints a kernel information string.\n");
-	fprintf(fp, "example: %s name\n", argv0);
-	fprintf(fp, "example: %s version\n", argv0);
-	fprintf(fp, "example: %s builddate\n", argv0);
-	fprintf(fp, "example: %s buildtime\n", argv0);
-}
-
-static void version(FILE* fp, const char* argv0)
-{
-	fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
-}
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 int main(int argc, char* argv[])
 {
-	const char* argv0 = argv[0];
 	for ( int i = 1; i < argc; i++ )
 	{
 		const char* arg = argv[i];
@@ -56,21 +42,11 @@ int main(int argc, char* argv[])
 			while ( (c = *++arg) ) switch ( c )
 			{
 			default:
-				fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
-				help(stderr, argv0);
-				exit(1);
+				errx(1, "unknown option -- '%c'\n", c);
 			}
 		}
-		else if ( !strcmp(arg, "--help") )
-			help(stdout, argv0), exit(0);
-		else if ( !strcmp(arg, "--version") )
-			version(stdout, argv0), exit(0);
 		else
-		{
-			fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
-			help(stderr, argv0);
-			exit(1);
-		}
+			errx(1, "unknown option: %s\n", arg);
 	}
 	size_t bufsize = 32;
 	char* buf = (char*) malloc(bufsize);