[klibc] Simple test suite for klibc

A very simple handful of tests for klibc.  This is not by any
means an exhaustive test suite, nor are most of the tests
auto-verifying, but they are very useful to spot common porting
problems.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

---
commit 8e3c5fb032d23c1fb4089bf149bae54df582c493
tree e0a5e0f40503eb4243783e5271f60e212747a308
parent 39703f84255c728b442cb532efdbe022eb1f886e
author H. Peter Anvin <hpa@zytor.com> Sun, 02 Jul 2006 12:26:02 -0700
committer H. Peter Anvin <hpa@zytor.com> Sun, 02 Jul 2006 12:26:02 -0700

 usr/klibc/tests/Kbuild        |   47 
 usr/klibc/tests/environ.c     |   24 
 usr/klibc/tests/fcntl.c       |   50 
 usr/klibc/tests/getopttest.c  |   32 
 usr/klibc/tests/getpagesize.c |   10 
 usr/klibc/tests/hello.c       |    7 
 usr/klibc/tests/idtest.c      |   14 
 usr/klibc/tests/malloctest.c  | 4146 +++++++++++++++++++++++++++++++++++++++++
 usr/klibc/tests/malloctest2.c |   62 +
 usr/klibc/tests/memstrtest.c  |   28 
 usr/klibc/tests/microhello.c  |    9 
 usr/klibc/tests/minihello.c   |    7 
 usr/klibc/tests/mmaptest.c    |   73 +
 usr/klibc/tests/opentest.c    |   15 
 usr/klibc/tests/pipetest.c    |   39 
 usr/klibc/tests/rtsig.c       |   12 
 usr/klibc/tests/setenvtest.c  |   39 
 usr/klibc/tests/setjmptest.c  |   38 
 usr/klibc/tests/sigint.c      |   53 +
 usr/klibc/tests/stat.c        |   63 +
 usr/klibc/tests/statfs.c      |   42 
 usr/klibc/tests/strlcpycat.c  |  111 +
 usr/klibc/tests/strtoimax.c   |   23 
 usr/klibc/tests/strtotime.c   |   25 
 usr/klibc/tests/testrand48.c  |   19 
 usr/klibc/tests/testvsnp.c    |  119 +
 usr/klibc/tests/vfork.c       |   45 
 27 files changed, 5152 insertions(+), 0 deletions(-)

diff --git a/usr/klibc/tests/Kbuild b/usr/klibc/tests/Kbuild
new file mode 100644
index 0000000..a97e86c
--- /dev/null
+++ b/usr/klibc/tests/Kbuild
@@ -0,0 +1,47 @@
+#
+# Kbuild file for all test files
+#
+
+test-files := $(wildcard $(srctree)/$(src)/*.c)
+test-files := $(notdir $(test-files))
+
+# This particular file uses a bunch of formats gcc don't know of, in order
+# to test the full range of our vsnprintf() function.  This outputs a bunch
+# of useless warnings unless we tell it not to.
+KLIBCCFLAGS_testvsnp.o := -Wno-format
+
+static-y := $(test-files:.c=)
+shared-y := $(addsuffix .shared, $(static-y))
+
+environ.shared-y	:= environ.o
+fcntl.shared-y		:= fcntl.o
+getopttest.shared-y	:= getopttest.o
+getpagesize.shared-y	:= getpagesize.o
+hello.shared-y		:= hello.o
+idtest.shared-y		:= idtest.o
+malloctest.shared-y	:= malloctest.o
+malloctest2.shared-y	:= malloctest2.o
+memstrtest.shared-y	:= memstrtest.o
+microhello.shared-y	:= microhello.o
+minihello.shared-y	:= minihello.o
+mmaptest.shared-y	:= mmaptest.o
+nfs_no_rpc.shared-y	:= nfs_no_rpc.o
+opentest.shared-y	:= opentest.o
+pipetest.shared-y	:= pipetest.o
+rtsig.shared-y		:= rtsig.o
+setenvtest.shared-y	:= setenvtest.o
+setjmptest.shared-y	:= setjmptest.o
+sigint.shared-y		:= sigint.o
+stat.shared-y		:= stat.o
+statfs.shared-y		:= statfs.o
+strlcpycat.shared-y	:= strlcpycat.o
+strtoimax.shared-y	:= strtoimax.o
+strtotime.shared-y	:= strtotime.o
+testrand48.shared-y	:= testrand48.o
+testvsnp.shared-y	:= testvsnp.o
+vfork.shared-y		:= vfork.o
+
+# Cleaning
+clean-files := $(static-y) $(shared-y) \
+	$(addsuffix .g, $(static-y) $(shared-y)) \
+	$(test-files:.c=.o)
diff --git a/usr/klibc/tests/environ.c b/usr/klibc/tests/environ.c
new file mode 100644
index 0000000..b5b082d
--- /dev/null
+++ b/usr/klibc/tests/environ.c
@@ -0,0 +1,24 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[], char *envp[])
+{
+	int i;
+
+	/* Verify envp == environ */
+	printf("Verifying envp == environ... %s\n",
+	       (envp == environ) ? "ok" : "ERROR");
+
+	/* Test argc/argv */
+	printf("argc = %d, argv = %p\n", argc, argv);
+	for (i = 0; i < argc; i++) {
+		printf("argv[%2d] = %s\n", i, argv[i]);
+	}
+
+	/* Test environ */
+	for (i = 0; envp[i]; i++)
+		printf("%s\n", envp[i]);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/fcntl.c b/usr/klibc/tests/fcntl.c
new file mode 100644
index 0000000..97aa3a7
--- /dev/null
+++ b/usr/klibc/tests/fcntl.c
@@ -0,0 +1,50 @@
+/*
+ * Simple test of fcntl
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char *argv[])
+{
+	int fd = open(argv[0], O_RDONLY);
+	struct flock l;
+	long flags;
+
+	(void)argc;
+
+	if (fd < 0) {
+		perror("open");
+		exit(1);
+	}
+
+	/* Get the flags on this FD */
+
+	if ((flags = fcntl(fd, F_GETFL)) == -1) {
+		perror("F_GETFL");
+		exit(1);
+	}
+
+	if (flags != (O_RDONLY | O_LARGEFILE))
+		fprintf(stderr, "flags = %#lx\n", flags);
+
+	/* Set a lock on this FD */
+	memset(&l, 0, sizeof l);
+	l.l_type = F_RDLCK;
+	l.l_whence = SEEK_SET;
+	l.l_start = 123;
+	l.l_len = 456;
+
+	if (fcntl(fd, F_SETLK, &l) == -1) {
+		perror("F_SETLK");
+		exit(1);
+	}
+
+	/* Eventually, fork and try to conflict with this lock... */
+
+	return 0;
+}
diff --git a/usr/klibc/tests/getopttest.c b/usr/klibc/tests/getopttest.c
new file mode 100644
index 0000000..58619d1
--- /dev/null
+++ b/usr/klibc/tests/getopttest.c
@@ -0,0 +1,32 @@
+/*
+ * getopttest.c
+ *
+ * Simple test for getopt, set the environment variable GETOPTTEST
+ * to give the argument string to getopt()
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main(int argc, char *const *argv)
+{
+	const char *parser;
+	char showchar[] = "\'?\'";
+	int c;
+
+	parser = getenv("GETOPTTEST");
+	if (!parser)
+		parser = "abzf:o:";
+
+	do {
+		c = getopt(argc, argv, parser);
+		showchar[1] = c;
+		printf
+		    ("c = %s, optind = %d (%s), optarg = \"%s\", optopt = \'%c\'\n",
+		     (c == EOF) ? "EOF" : showchar, optind, argv[optind],
+		     optarg, optopt);
+	} while (c != -1);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/getpagesize.c b/usr/klibc/tests/getpagesize.c
new file mode 100644
index 0000000..1ae946a
--- /dev/null
+++ b/usr/klibc/tests/getpagesize.c
@@ -0,0 +1,10 @@
+#include <unistd.h>
+#include <stdio.h>
+
+int main(void)
+{
+	printf("getpagesize()    = %d\n"
+	       "__getpageshift() = %d\n", getpagesize(), __getpageshift());
+
+	return 0;
+}
diff --git a/usr/klibc/tests/hello.c b/usr/klibc/tests/hello.c
new file mode 100644
index 0000000..3f859bd
--- /dev/null
+++ b/usr/klibc/tests/hello.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(void)
+{
+	printf("Hello, World!\n");
+	return 0;
+}
diff --git a/usr/klibc/tests/idtest.c b/usr/klibc/tests/idtest.c
new file mode 100644
index 0000000..c3c4447
--- /dev/null
+++ b/usr/klibc/tests/idtest.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void)
+{
+	printf("pid   = %u\n", getpid());
+	printf("ppid  = %u\n", getppid());
+	printf("uid   = %u\n", getuid());
+	printf("euid  = %u\n", geteuid());
+	printf("gid   = %u\n", getgid());
+	printf("egid  = %u\n", getegid());
+	sleep(10);
+	return 0;
+}
diff --git a/usr/klibc/tests/malloctest.c b/usr/klibc/tests/malloctest.c
new file mode 100644
index 0000000..2ae184e
--- /dev/null
+++ b/usr/klibc/tests/malloctest.c
@@ -0,0 +1,4146 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define NCYCLES 4096
+
+int sizes[NCYCLES] = {
+	11986,
+	277806,
+	2659,
+	46,
+	0,
+	775553,
+	1991,
+	21,
+	7638,
+	250197,
+	155828,
+	5777,
+	9,
+	315006,
+	900788,
+	0,
+	24893,
+	119996,
+	72299,
+	171266,
+	357,
+	560,
+	368,
+	22952,
+	54058,
+	12638,
+	39155,
+	2738,
+	217563,
+	26853,
+	47,
+	75,
+	1167,
+	16917,
+	1899,
+	2905,
+	9337,
+	62243,
+	14214,
+	270523,
+	4024,
+	21,
+	32,
+	14892,
+	625144,
+	13,
+	21700,
+	8804,
+	254147,
+	0,
+	6,
+	836004,
+	1718,
+	2289,
+	15554,
+	412857,
+	185097,
+	806709,
+	64,
+	18602,
+	17064,
+	1779,
+	78153,
+	170600,
+	199100,
+	546528,
+	0,
+	21,
+	20609,
+	16514,
+	548196,
+	311446,
+	53484,
+	0,
+	551,
+	22225,
+	24,
+	153989,
+	457309,
+	526833,
+	227979,
+	757167,
+	429560,
+	0,
+	835,
+	1702,
+	475275,
+	798416,
+	753,
+	0,
+	11126,
+	145779,
+	2006,
+	0,
+	8182,
+	0,
+	569432,
+	9671,
+	36,
+	5523,
+	407325,
+	0,
+	65,
+	9293,
+	0,
+	6793,
+	468701,
+	73,
+	0,
+	186236,
+	0,
+	328405,
+	125616,
+	508013,
+	380519,
+	599518,
+	83,
+	151973,
+	466906,
+	9029,
+	159725,
+	1316,
+	1,
+	911532,
+	1508,
+	19050,
+	972850,
+	126,
+	439377,
+	29,
+	37928,
+	149628,
+	54,
+	130248,
+	2,
+	143,
+	0,
+	716873,
+	3327,
+	5,
+	116131,
+	5124,
+	559621,
+	2886,
+	534,
+	186432,
+	441,
+	7348,
+	10331,
+	1,
+	260935,
+	7,
+	4370,
+	405415,
+	2,
+	84518,
+	1970,
+	1,
+	281910,
+	46,
+	274,
+	2273,
+	370565,
+	4190,
+	820641,
+	577970,
+	32809,
+	974893,
+	398067,
+	380698,
+	4,
+	25978,
+	153,
+	882668,
+	312365,
+	9523,
+	156421,
+	0,
+	268143,
+	6,
+	2,
+	42987,
+	212,
+	12303,
+	6723,
+	1179,
+	0,
+	120924,
+	3877,
+	330421,
+	310445,
+	39264,
+	8,
+	85380,
+	464716,
+	0,
+	33657,
+	6285,
+	0,
+	4491,
+	229,
+	50,
+	373197,
+	6029,
+	19,
+	86884,
+	243745,
+	335656,
+	90945,
+	38973,
+	572950,
+	164129,
+	0,
+	3,
+	17,
+	13579,
+	4448,
+	47,
+	3,
+	132966,
+	726249,
+	498503,
+	256,
+	0,
+	25841,
+	0,
+	7,
+	945380,
+	11872,
+	69,
+	3799,
+	77223,
+	1914,
+	73,
+	810968,
+	10223,
+	257918,
+	184252,
+	350,
+	8101,
+	725,
+	9,
+	2,
+	2089,
+	175,
+	247,
+	185964,
+	36517,
+	3723,
+	313465,
+	209,
+	1300,
+	128071,
+	7425,
+	2436,
+	62,
+	13753,
+	9514,
+	41,
+	409141,
+	46643,
+	20866,
+	15664,
+	388548,
+	84692,
+	9549,
+	610,
+	7213,
+	14,
+	14930,
+	244719,
+	4748,
+	41682,
+	401098,
+	102506,
+	176535,
+	0,
+	5133,
+	548,
+	5234,
+	56,
+	11101,
+	87638,
+	336579,
+	291705,
+	640250,
+	768165,
+	370,
+	2809,
+	3,
+	0,
+	445122,
+	47190,
+	24885,
+	143556,
+	84,
+	504726,
+	610020,
+	40355,
+	902230,
+	4360,
+	1747,
+	3496,
+	489501,
+	19,
+	801601,
+	62189,
+	48,
+	2645,
+	320601,
+	27304,
+	17740,
+	344,
+	10,
+	991,
+	925503,
+	0,
+	315,
+	251,
+	3611,
+	1756,
+	683,
+	165,
+	380132,
+	181101,
+	453041,
+	892056,
+	67191,
+	252592,
+	32407,
+	56242,
+	8,
+	297173,
+	542903,
+	830334,
+	585236,
+	422555,
+	44769,
+	0,
+	68,
+	4143,
+	38754,
+	73539,
+	44579,
+	94001,
+	428537,
+	38554,
+	106612,
+	0,
+	182987,
+	831731,
+	3605,
+	752851,
+	52,
+	72,
+	120872,
+	963754,
+	31,
+	764,
+	240592,
+	99101,
+	328538,
+	440325,
+	12211,
+	151282,
+	353436,
+	2991,
+	40710,
+	5212,
+	5106,
+	139122,
+	148915,
+	498505,
+	1366,
+	516,
+	29190,
+	17,
+	224208,
+	40,
+	89,
+	19190,
+	8,
+	25377,
+	10029,
+	720,
+	97963,
+	0,
+	614,
+	244567,
+	2113,
+	903675,
+	8388,
+	6,
+	390705,
+	325006,
+	284272,
+	108086,
+	17,
+	2628,
+	952530,
+	20474,
+	898276,
+	138661,
+	3883,
+	903,
+	569993,
+	376918,
+	5849,
+	103404,
+	794499,
+	35388,
+	5,
+	0,
+	961626,
+	27415,
+	1927,
+	92036,
+	46241,
+	35978,
+	7426,
+	399884,
+	29490,
+	252655,
+	675971,
+	3509,
+	54170,
+	170790,
+	831341,
+	134579,
+	0,
+	790422,
+	35,
+	930830,
+	97394,
+	20265,
+	670,
+	38497,
+	1759,
+	71209,
+	93,
+	736,
+	11,
+	886,
+	1961,
+	7,
+	210607,
+	62226,
+	186736,
+	1518,
+	5,
+	5,
+	13,
+	66989,
+	442321,
+	0,
+	607939,
+	11253,
+	210875,
+	495530,
+	2,
+	221136,
+	377663,
+	372,
+	200658,
+	18591,
+	129783,
+	803411,
+	867506,
+	757446,
+	48836,
+	34,
+	200,
+	114983,
+	7287,
+	22849,
+	226669,
+	13,
+	0,
+	20164,
+	7828,
+	39,
+	49448,
+	26740,
+	185566,
+	9927,
+	36192,
+	91068,
+	338368,
+	926,
+	27746,
+	534794,
+	936132,
+	2922,
+	5,
+	183162,
+	256846,
+	242551,
+	134318,
+	212959,
+	167162,
+	470,
+	477045,
+	532116,
+	483794,
+	733,
+	5335,
+	83074,
+	4686,
+	9567,
+	1,
+	195100,
+	40354,
+	87338,
+	369,
+	800,
+	0,
+	194504,
+	469051,
+	363532,
+	850574,
+	5085,
+	167027,
+	794511,
+	124320,
+	303231,
+	132195,
+	13225,
+	46333,
+	4313,
+	89,
+	799,
+	51482,
+	0,
+	26,
+	12659,
+	1045,
+	23621,
+	0,
+	74926,
+	490979,
+	6,
+	3188,
+	9448,
+	174730,
+	38982,
+	102317,
+	189621,
+	853,
+	29227,
+	43374,
+	423,
+	420951,
+	686,
+	128,
+	31291,
+	0,
+	402819,
+	663143,
+	55903,
+	142,
+	2,
+	331584,
+	197164,
+	7,
+	671983,
+	53,
+	5020,
+	9782,
+	123,
+	743407,
+	1276,
+	1115,
+	1169,
+	122752,
+	824690,
+	292030,
+	2094,
+	144626,
+	0,
+	297278,
+	440,
+	742,
+	95879,
+	17682,
+	10654,
+	31,
+	22183,
+	746,
+	0,
+	0,
+	11185,
+	28,
+	394987,
+	36,
+	474,
+	243749,
+	1431,
+	56702,
+	76,
+	15619,
+	33071,
+	12181,
+	158647,
+	261786,
+	1,
+	119783,
+	48816,
+	6278,
+	4121,
+	61122,
+	69,
+	48790,
+	345335,
+	275917,
+	964393,
+	424,
+	586433,
+	20519,
+	18156,
+	756400,
+	27736,
+	458706,
+	1,
+	3286,
+	929624,
+	1883,
+	2,
+	1086,
+	439501,
+	552,
+	157132,
+	5565,
+	105061,
+	8199,
+	23,
+	178797,
+	0,
+	130644,
+	1,
+	6952,
+	754,
+	500,
+	647683,
+	0,
+	959079,
+	622561,
+	1131,
+	559783,
+	6862,
+	175420,
+	408671,
+	463461,
+	55908,
+	606496,
+	169,
+	49060,
+	247,
+	953,
+	333030,
+	0,
+	23399,
+	29193,
+	9303,
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+	1535,
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+	1075,
+	925071,
+	86,
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+	0,
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+	4790,
+	73175,
+	69677,
+	367627,
+	238650,
+	303543,
+	1,
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+	21392,
+	10,
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+	0,
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+	158496,
+	7000,
+	1865,
+	20385,
+	0,
+	54213,
+	9948,
+	102667,
+	6963,
+	71,
+	555744,
+	5626,
+	2512,
+	1124,
+	7171,
+	628,
+	29225,
+	321687,
+	61519,
+	4,
+	8352,
+	9156,
+};
+
+char *pointers[NCYCLES];
+
+int main(void)
+{
+	int r, i, j, sp, sq;
+	char *p, *q, *ep, *eq;
+	int ok;
+	int err = 0;
+
+	for (r = 0; r < 4; r++) {
+		for (i = 0; i < NCYCLES; i++) {
+			pointers[i] = p = malloc(sp = sizes[i]);
+			ep = p + sp;
+			ok = 1;
+			for (j = 0; j < i; j++) {
+				q = pointers[j];
+				sq = sizes[j];
+				eq = q + sq;
+
+				if ((p < q && ep > q) || (p >= q && p < eq)) {
+					ok = 0;
+					err = 1;
+					break;
+				}
+			}
+			printf("Allocated %6d bytes at %p, ok = %d\n", sp, p,
+			       ok);
+
+			if (p)
+				memset(p, 0xee, sp);	/* Poison this memory */
+		}
+
+		for (i = 0; i < NCYCLES; i++) {
+			free(pointers[i]);
+			printf("Freed %6d bytes at %p\n", sizes[i],
+			       pointers[i]);
+		}
+	}
+
+	return err;
+}
diff --git a/usr/klibc/tests/malloctest2.c b/usr/klibc/tests/malloctest2.c
new file mode 100644
index 0000000..1845073
--- /dev/null
+++ b/usr/klibc/tests/malloctest2.c
@@ -0,0 +1,62 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define NCYCLES 32768
+#define NSLOTS  4096
+
+struct slot {
+	char *ptr;
+	size_t size;
+};
+
+struct slot s[NSLOTS];
+
+int main(void)
+{
+	size_t sp, sq;
+	char *p, *ep, *q, *eq;
+	int r, i, j;
+	int ok;
+	int err = 0;
+
+	for (r = 0; r < NCYCLES; r++) {
+		i = lrand48() % NSLOTS;
+
+		if (s[i].ptr) {
+			free(s[i].ptr);
+			printf("Freed     %8zu bytes at %p\n", s[i].size,
+			       s[i].ptr);
+			s[i].ptr = NULL;
+			s[i].size = 0;
+		} else {
+			sp = lrand48();	/* 32-bit random number */
+			sp >>= 12 + (lrand48() % 20);
+
+			s[i].size = sp;
+			s[i].ptr = p = malloc(sp);
+			ep = p + sp;
+			ok = 1;
+			for (j = 0; j < NSLOTS; j++) {
+				q = s[j].ptr;
+				if (i != j && q) {
+					sq = s[j].size;
+					eq = q + sq;
+
+					if ((p < q && ep > q)
+					    || (p >= q && p < eq)) {
+						ok = 0;
+						err = 1;
+						break;
+					}
+				}
+			}
+			printf("Allocated %8zu bytes at %p, ok = %d\n", sp, p,
+			       ok);
+
+			if (p)
+				memset(p, 0xee, sp);	/* Poison this memory */
+		}
+	}
+	return err;
+}
diff --git a/usr/klibc/tests/memstrtest.c b/usr/klibc/tests/memstrtest.c
new file mode 100644
index 0000000..8d473fb
--- /dev/null
+++ b/usr/klibc/tests/memstrtest.c
@@ -0,0 +1,28 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+	unsigned char t1[256], t2[256];
+	int i;
+	int r;
+
+	for (i = 0; i < (int)sizeof(t1); i++)
+		t1[i] = t2[i] = (unsigned char)i;
+
+	r = memcmp(t1, t2, sizeof(t1));
+	printf("memcmp r = %d\n", r);
+	r = memcmp(t1, t2, sizeof(t1) / 2);
+	printf("memcmp r = %d\n", r);
+	t1[255] = 0;
+	r = memcmp(t1, t2, sizeof(t1));
+	printf("memcmp r = %d\n", r);
+
+	for (i = 0; i < (int)sizeof(t1); i++)
+		t1[i] = 0xaa;
+	memset(t2, 0xaa, sizeof(t2));
+	r = memcmp(t1, t2, sizeof(t1));
+	printf("memcmp r = %d\n", r);
+	return 0;
+}
diff --git a/usr/klibc/tests/microhello.c b/usr/klibc/tests/microhello.c
new file mode 100644
index 0000000..c999d11
--- /dev/null
+++ b/usr/klibc/tests/microhello.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void)
+{
+	static const char hello[] = "Hello, World!\n";
+	_fwrite(hello, sizeof hello - 1, stdout);
+	return 0;
+}
diff --git a/usr/klibc/tests/minihello.c b/usr/klibc/tests/minihello.c
new file mode 100644
index 0000000..ae9072e
--- /dev/null
+++ b/usr/klibc/tests/minihello.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(void)
+{
+	fputs("Hello, World!\n", stdout);
+	return 0;
+}
diff --git a/usr/klibc/tests/mmaptest.c b/usr/klibc/tests/mmaptest.c
new file mode 100644
index 0000000..eac04e8
--- /dev/null
+++ b/usr/klibc/tests/mmaptest.c
@@ -0,0 +1,73 @@
+/*
+ * mmaptest.c
+ *
+ * Test some simple cases of mmap()
+ */
+
+#include <sys/mman.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdint.h>
+#include <fcntl.h>
+
+static void make_test_file(int fd)
+{
+	unsigned long v;
+	FILE *f = fdopen(fd, "wb");
+
+	for (v = 0; v < 262144; v += sizeof(v))
+		_fwrite(&v, sizeof(v), f);
+}
+
+int main(int argc, char *argv[])
+{
+	void *foo;
+	char *test_file = (argc > 1) ? argv[1] : "/tmp/mmaptest.tmp";
+	int rv, fd;
+
+	/* Important case, this is how we get memory for malloc() */
+	errno = 0;
+	foo = mmap(NULL, 65536, PROT_READ | PROT_WRITE,
+		   MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+
+	printf("mmap() returned %p, errno = %d\n", foo, errno);
+	if (foo == MAP_FAILED)
+		return 1;
+
+	rv = munmap(foo, 65536);
+	printf("munmap() returned %d, errno = %d\n", rv, errno);
+	if (rv)
+		return 1;
+
+	/* Create test file */
+	fd = open(test_file, O_RDWR | O_CREAT | O_TRUNC, 0666);
+	if (fd < 0) {
+		perror(test_file);
+		return 1;
+	}
+
+	make_test_file(fd);
+
+	/* Map test file */
+	foo = mmap(NULL, 65536, PROT_READ, MAP_SHARED, fd, 131072);
+	printf("mmap() returned %p, errno = %d\n", foo, errno);
+	if (foo == MAP_FAILED)
+		return 1;
+
+	if (*(unsigned long *)foo != 131072) {
+		printf("mmap() with offset returned the wrong offset %ld!\n",
+		       *(unsigned long *)foo);
+		return 1;
+	}
+
+	if (munmap(foo, 65536)) {
+		printf("munmap() returned nonzero, errno = %d\n", errno);
+		return 1;
+	}
+
+	close(fd);
+	unlink(test_file);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/opentest.c b/usr/klibc/tests/opentest.c
new file mode 100644
index 0000000..8be7b3d
--- /dev/null
+++ b/usr/klibc/tests/opentest.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main(void)
+{
+	char buffer[1024];
+	FILE *f;
+
+	f = fopen("/etc/passwd", "r");
+	fgets(buffer, 1024, f);
+	fclose(f);
+
+	printf("Line 1 = %s", buffer);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/pipetest.c b/usr/klibc/tests/pipetest.c
new file mode 100644
index 0000000..0e49721
--- /dev/null
+++ b/usr/klibc/tests/pipetest.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+int main(void)
+{
+	/* Size of message must be <= PIPE_BUF */
+	const char msg[] = "Hello, World!";
+	char buf[512];
+	int rv;
+	int pfd[2];
+
+	if (pipe(pfd)) {
+		perror("pipe");
+		return 1;
+	}
+
+	if (write(pfd[1], msg, sizeof msg) != sizeof msg) {
+		perror("write");
+		return 1;
+	}
+
+	while ((rv = read(pfd[0], buf, sizeof buf)) < sizeof msg) {
+		if (rv == -1 && errno == EINTR)
+			continue;
+		perror("read");
+		return 1;
+	}
+
+	if (memcmp(msg, buf, sizeof msg)) {
+		fprintf(stderr, "Message miscompare!\n");
+		return 1;
+	}
+
+	return 0;
+}
diff --git a/usr/klibc/tests/rtsig.c b/usr/klibc/tests/rtsig.c
new file mode 100644
index 0000000..a7f8eed
--- /dev/null
+++ b/usr/klibc/tests/rtsig.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <signal.h>
+
+int main(void)
+{
+#ifdef SIGRTMIN
+	printf("sigrtmin = %d, sigrtmax = %d\n", SIGRTMIN, SIGRTMAX);
+#else
+	printf("No realtime signals\n");
+#endif
+	return 0;
+}
diff --git a/usr/klibc/tests/setenvtest.c b/usr/klibc/tests/setenvtest.c
new file mode 100644
index 0000000..1b07199
--- /dev/null
+++ b/usr/klibc/tests/setenvtest.c
@@ -0,0 +1,39 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+	(void)argc;
+	(void)argv;
+
+	/* Set SETENV */
+	setenv("SETENV", "setenv", 1);
+
+	/* Set PUTENV */
+	putenv("PUTENV=putenv");
+
+	/* Print the results... */
+	printf("SETENV = %s\n", getenv("SETENV"));
+	printf("PUTENV = %s\n", getenv("PUTENV"));
+
+	/* Override tests */
+	setenv("SETENV", "setenv_good", 1);
+	putenv("PUTENV=putenv_good");
+	printf("SETENV = %s\n", getenv("SETENV"));
+	printf("PUTENV = %s\n", getenv("PUTENV"));
+
+	/* Non-override test */
+	setenv("SETENV", "setenv_bad", 0);
+	setenv("NEWENV", "newenv_good", 0);
+	printf("SETENV = %s\n", getenv("SETENV"));
+	printf("NEWENV = %s\n", getenv("NEWENV"));
+
+	/* Undef test */
+	unsetenv("SETENV");
+	unsetenv("NEWENV");
+	printf("SETENV = %s\n", getenv("SETENV"));
+	printf("NEWENV = %s\n", getenv("NEWENV"));
+
+	return 0;
+}
diff --git a/usr/klibc/tests/setjmptest.c b/usr/klibc/tests/setjmptest.c
new file mode 100644
index 0000000..30c4e16
--- /dev/null
+++ b/usr/klibc/tests/setjmptest.c
@@ -0,0 +1,38 @@
+/*
+ * setjmptest.c
+ */
+
+#include <stdio.h>
+#include <setjmp.h>
+
+static jmp_buf buf;
+
+void do_stuff(int v)
+{
+	printf("calling longjmp with %d... ", v + 1);
+	longjmp(buf, v + 1);
+}
+
+void recurse(int ctr, int v)
+{
+	if (ctr--) {
+		recurse(ctr, v);
+	} else {
+		do_stuff(v);
+	}
+
+	printf("ERROR!\n");	/* We should never get here... */
+}
+
+int main(void)
+{
+	int v;
+
+	v = setjmp(buf);
+	printf("setjmp returned %d\n", v);
+
+	if (v < 256)
+		recurse(v, v);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/sigint.c b/usr/klibc/tests/sigint.c
new file mode 100644
index 0000000..55ed6ef
--- /dev/null
+++ b/usr/klibc/tests/sigint.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+
+static sig_atomic_t counter = 0;
+
+static void sig_handler(int signum)
+{
+	static char msg[] = "Signal handler\n";
+
+	(void)signum;
+
+	write(1, msg, sizeof msg - 1);
+	counter++;
+}
+
+int main(int argc, char *argv[])
+{
+	struct sigaction act, oact;
+	pid_t f;
+
+	(void)argc;
+
+	memset(&act, 0x00, sizeof(struct sigaction));
+	act.sa_handler = sig_handler;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = SA_RESTART;
+
+	/* oact is there for the benefit of strace() */
+	sigaction(SIGINT, &act, &oact);
+	sigaction(SIGTERM, &act, &oact);
+
+	f = fork();
+
+	if (f < 0) {
+		perror(argv[0]);
+		exit(255);
+	} else if (f > 0) {
+		sleep(5);
+		if (!counter) {
+			fprintf(stderr, "No signal received!\n");
+			exit(1);
+		} else {
+			printf("Signal received OK\n");
+			exit(0);
+		}
+	} else {
+		sleep(1);
+		kill(getppid(), SIGINT);
+		_exit(0);
+	}
+}
diff --git a/usr/klibc/tests/stat.c b/usr/klibc/tests/stat.c
new file mode 100644
index 0000000..90223cf
--- /dev/null
+++ b/usr/klibc/tests/stat.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+
+static void do_stat(const char *path)
+{
+	struct stat st;
+
+	if (stat(path, &st)) {
+		perror(path);
+		exit(1);
+	}
+
+	printf("Path = %s\n"
+	       "   st_dev       = %#jx (%u,%u)\n"
+	       "   st_ino       = %ju\n"
+	       "   st_mode      = %#jo\n"
+	       "   st_nlink     = %ju\n"
+	       "   st_uid       = %ju\n"
+	       "   st_gid       = %ju\n"
+	       "   st_rdev      = %#jx (%u,%u)\n"
+	       "   st_size      = %ju\n"
+	       "   st_blksize   = %ju\n"
+	       "   st_blocks    = %ju\n",
+	       path,
+	       (uintmax_t) st.st_dev, major(st.st_dev), minor(st.st_dev),
+	       (uintmax_t) st.st_ino,
+	       (uintmax_t) st.st_mode,
+	       (uintmax_t) st.st_nlink,
+	       (uintmax_t) st.st_uid,
+	       (uintmax_t) st.st_gid,
+	       (uintmax_t) st.st_rdev, major(st.st_rdev), minor(st.st_rdev),
+	       (uintmax_t) st.st_size,
+	       (uintmax_t) st.st_blksize, (uintmax_t) st.st_blocks);
+
+#ifdef _STATBUF_ST_NSEC
+	printf("   st_atim      = %jd.%09u\n"
+	       "   st.mtim      = %jd.%09u\n"
+	       "   st.ctim      = %jd.%09u\n",
+	       (uintmax_t) st.st_atim.tv_sec, (unsigned int)st.st_atim.tv_nsec,
+	       (uintmax_t) st.st_mtim.tv_sec, (unsigned int)st.st_mtim.tv_nsec,
+	       (uintmax_t) st.st_ctim.tv_sec, (unsigned int)st.st_ctim.tv_nsec);
+#else
+	printf("   st_atime     = %jd\n"
+	       "   st.mtime     = %jd\n"
+	       "   st.ctime     = %jd\n",
+	       (uintmax_t) st.st_atime,
+	       (uintmax_t) st.st_mtime, (uintmax_t) st.st_ctime);
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+	int i;
+
+	for (i = 1; i < argc; i++)
+		do_stat(argv[i]);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/statfs.c b/usr/klibc/tests/statfs.c
new file mode 100644
index 0000000..0cf99f1
--- /dev/null
+++ b/usr/klibc/tests/statfs.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/vfs.h>
+
+static void do_statfs(const char *path)
+{
+	struct statfs sfs;
+
+	if (statfs(path, &sfs)) {
+		perror(path);
+		exit(1);
+	}
+
+	printf("Path = %s\n"
+	       "   f_type     = %#jx\n"
+	       "   f_bsize    = %jd\n"
+	       "   f_blocks   = %jd\n"
+	       "   f_bfree    = %jd\n"
+	       "   f_bavail   = %jd\n"
+	       "   f_files    = %jd\n"
+	       "   f_ffree    = %jd\n"
+	       "   f_namelen  = %jd\n",
+	       path,
+	       (uintmax_t) sfs.f_type,
+	       (intmax_t) sfs.f_bsize,
+	       (intmax_t) sfs.f_blocks,
+	       (intmax_t) sfs.f_bfree,
+	       (intmax_t) sfs.f_bavail,
+	       (intmax_t) sfs.f_files,
+	       (intmax_t) sfs.f_ffree, (intmax_t) sfs.f_namelen);
+}
+
+int main(int argc, char *argv[])
+{
+	int i;
+
+	for (i = 1; i < argc; i++)
+		do_statfs(argv[i]);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/strlcpycat.c b/usr/klibc/tests/strlcpycat.c
new file mode 100644
index 0000000..14df0cd
--- /dev/null
+++ b/usr/klibc/tests/strlcpycat.c
@@ -0,0 +1,111 @@
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(void)
+{
+	char temp[8];
+	size_t len;
+
+	printf("strlcpy:\n");
+	len = strlcpy(temp, "123", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "123") != 0)
+		goto error;
+
+	len = strlcpy(temp, "", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "") != 0)
+		goto error;
+
+	len = strlcpy(temp, "1234567890", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "1234567") != 0)
+		goto error;
+
+	len = strlcpy(temp, "123", 1);
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "") != 0)
+		goto error;
+
+	len = strlcpy(temp, "1234567890", 1);
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "") != 0)
+		goto error;
+
+	len = strlcpy(temp, "123", 0);
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "") != 0)
+		goto error;
+
+	len = strlcpy(temp, "1234567890", 0);
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "") != 0)
+		goto error;
+
+	len = strlcpy(temp, "1234567", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "1234567") != 0)
+		goto error;
+
+	len = strlcpy(temp, "12345678", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "1234567") != 0)
+		goto error;
+
+	printf("\n");
+	printf("strlcat:\n");
+	strcpy(temp, "");
+	len = strlcat(temp, "123", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "123") != 0)
+		goto error;
+
+	strcpy(temp, "ABC");
+	len = strlcat(temp, "", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "ABC") != 0)
+		goto error;
+
+	strcpy(temp, "");
+	len = strlcat(temp, "", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "") != 0)
+		goto error;
+
+	strcpy(temp, "ABC");
+	len = strlcat(temp, "123", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "ABC123") != 0)
+		goto error;
+
+	strcpy(temp, "ABC");
+	len = strlcat(temp, "1234567890", sizeof(temp));
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "ABC1234") != 0)
+		goto error;
+
+	strcpy(temp, "ABC");
+	len = strlcat(temp, "123", 5);
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "ABC1") != 0)
+		goto error;
+
+	strcpy(temp, "ABC");
+	len = strlcat(temp, "123", 1);
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "ABC") != 0)
+		goto error;
+
+	strcpy(temp, "ABC");
+	len = strlcat(temp, "123", 0);
+	printf("'%s'len:%zu strlen:%zu\n", temp, len, strlen(temp));
+	if (strcmp(temp, "ABC") != 0)
+		goto error;
+
+	exit(0);
+error:
+	printf("unexpected result\n");
+	exit(1);
+}
diff --git a/usr/klibc/tests/strtoimax.c b/usr/klibc/tests/strtoimax.c
new file mode 100644
index 0000000..318f2d4
--- /dev/null
+++ b/usr/klibc/tests/strtoimax.c
@@ -0,0 +1,23 @@
+/*
+ * strtoimaxtest.c
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+int main(int argc, char *argv[])
+{
+	int i;
+	char *ep;
+	intmax_t iv;
+
+	for (i = 1; i < argc; i++) {
+		iv = strtoimax(argv[i], &ep, 0);
+		printf("strtoimax(\"%s\") = %jd\n", argv[i], iv);
+		if (*ep)
+			printf("   ep = \"%s\"\n", ep);
+	}
+
+	return 0;
+}
diff --git a/usr/klibc/tests/strtotime.c b/usr/klibc/tests/strtotime.c
new file mode 100644
index 0000000..16d2e0f
--- /dev/null
+++ b/usr/klibc/tests/strtotime.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <time.h>
+
+int main(int argc, char *argv[])
+{
+	struct timeval tv;
+	struct timespec ts;
+	int i;
+	const char *rv, *rs;
+
+	for (i = 1; i < argc; i++) {
+		rs = strtotimespec(argv[i], &ts);
+		rv = strtotimeval(argv[i], &tv);
+		printf("String:   \"%s\"\n"
+		       "Timespec: %ld.%09ld\n"
+		       "Residual: \"%s\"\n"
+		       "Timeval:  %ld.%06ld\n"
+		       "Residual: \"%s\"\n",
+		       argv[i],
+		       (long)ts.tv_sec, (long)ts.tv_nsec, rs,
+		       (long)tv.tv_sec, (long)tv.tv_usec, rv);
+	}
+
+	return 0;
+}
diff --git a/usr/klibc/tests/testrand48.c b/usr/klibc/tests/testrand48.c
new file mode 100644
index 0000000..26868c7
--- /dev/null
+++ b/usr/klibc/tests/testrand48.c
@@ -0,0 +1,19 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int main(void)
+{
+	unsigned short seed1[] = { 0x1234, 0x5678, 0x9abc };
+	unsigned short *oldseed;
+
+	oldseed = seed48(seed1);
+	printf("Initial seed: %#06x %#06x %#06x\n",
+	       oldseed[0], oldseed[1], oldseed[2]);
+
+	printf("lrand48() = %ld\n", lrand48());
+
+	seed48(seed1);
+	printf("mrand48() = %ld\n", mrand48());
+
+	return 1;
+}
diff --git a/usr/klibc/tests/testvsnp.c b/usr/klibc/tests/testvsnp.c
new file mode 100644
index 0000000..098b49a
--- /dev/null
+++ b/usr/klibc/tests/testvsnp.c
@@ -0,0 +1,119 @@
+#include <assert.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+
+int main(void)
+{
+	int r, i;
+	char buffer[512];
+
+	r = snprintf(buffer, 512, "Hello, %d", 37);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'d", 37373737);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'x", 0xdeadbeef);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'#X", 0xdeadbeef);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'#llo", 0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	/* Make sure overflow works correctly */
+	memset(buffer, '\xff', 512);
+	r = snprintf(buffer, 16, "Hello, %'#llo", 0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+	for (i = 16; i < 512; i++)
+		assert(buffer[i] == '\xff');
+
+	r = snprintf(buffer, 512, "Hello, %'#40.20llo", 0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'#-40.20llo", 0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'#*.*llo", 40, 20,
+		     0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'#*.*llo", -40, 20,
+		     0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'#*.*llo", -40, -20,
+		     0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %'#*.*llx", -40, -20,
+		     0123456701234567ULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %p", &buffer);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %P", &buffer);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %20p", &buffer);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %-20p", &buffer);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 512, "Hello, %-20p", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 20, "Hello, %'-20p", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 15, "Hello, %'-20p", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 3, "Hello, %'-20p", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	/* This shouldn't change buffer in any way! */
+	r = snprintf(buffer, 0, "Hello, %'-20p", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	for (i = -30; i <= 30; i++) {
+		r = snprintf(buffer, 40, "Hello, %'*p", i, NULL);
+		printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer),
+		       r);
+	}
+
+	r = snprintf(buffer, 40, "Hello, %'-20s", "String");
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'20s", "String");
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'020s", "String");
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'-20s", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'20s", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'020s", NULL);
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'-20c", '*');
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'20c", '*');
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	r = snprintf(buffer, 40, "Hello, %'020c", '*');
+	printf("buffer = \"%s\" (%d), r = %d\n", buffer, strlen(buffer), r);
+
+	return 0;
+}
diff --git a/usr/klibc/tests/vfork.c b/usr/klibc/tests/vfork.c
new file mode 100644
index 0000000..7adc036
--- /dev/null
+++ b/usr/klibc/tests/vfork.c
@@ -0,0 +1,45 @@
+/*
+ * usr/klibc/tests/vfork.c
+ *
+ * vfork is messy on most architectures.  Do our best to test it out.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main(int argc, char *argv[])
+{
+	pid_t f, rv;
+	int status;
+
+	f = vfork();
+
+	if (f == 0) {
+		printf("Child (%d)...\n", (int)getpid());
+		_exit(123);
+	} else if (f > 0) {
+		int err = 0;
+
+		printf("Parent (child = %d)\n", (int)f);
+
+		rv = waitpid(f, &status, 0);
+		if (rv != f) {
+			printf("waitpid returned %d, errno = %d\n",
+			       (int)rv, errno);
+			err++;
+		}
+		if (!WIFEXITED(status) || WEXITSTATUS(status) != 123) {
+			printf("Child process existed with wrong status %d\n",
+			       status);
+			err++;
+		}
+		return err;
+	} else {
+		printf("vfork returned %d, errno = %d\n",
+		       (int)f, errno);
+		return 127;
+	}
+}