build: add libucontext test program

.gitignore

@@ -34,4 +34,5 @@ Makefile.in
 
 *.o
 test_libucontext
+libucontext.so
 libucontext.so.*

Makefile

@@ -13,17 +13,18 @@ LIBUCONTEXT_S_SRC = \
 
 LIBUCONTEXT_OBJ = ${LIBUCONTEXT_C_SRC:.c=.o} ${LIBUCONTEXT_S_SRC:.S=.o}
 LIBUCONTEXT_SOVERSION = 0
-LIBUCONTEXT_NAME = libucontext.so.${LIBUCONTEXT_SOVERSION}
-LIBUCONTEXT_PATH = /lib/${LIBUCONTEXT_NAME}
+LIBUCONTEXT_NAME = libucontext.so
+LIBUCONTEXT_SONAME = libucontext.so.${LIBUCONTEXT_SOVERSION}
+LIBUCONTEXT_PATH = /lib/${LIBUCONTEXT_SONAME}
 
-all: ${LIBUCONTEXT_NAME}
+all: ${LIBUCONTEXT_SONAME}
 
 ${LIBUCONTEXT_NAME}: ${LIBUCONTEXT_OBJ}
-	$(CC) -o ${LIBUCONTEXT_NAME} -Wl,-soname,${LIBUCONTEXT_NAME} \
+	$(CC) -o ${LIBUCONTEXT_NAME} -Wl,-soname,${LIBUCONTEXT_SONAME} \
 		-shared ${LIBUCONTEXT_OBJ}
 
-${LOADER_NAME}: ${LOADER_OBJ}
-	$(CC) -o ${LOADER_NAME} -fPIE -static ${LOADER_OBJ}
+${LIBUCONTEXT_SONAME}: ${LIBUCONTEXT_NAME}
+	ln -sf ${LIBUCONTEXT_NAME} ${LIBUCONTEXT_SONAME}
 
 .c.o:
 	$(CC) -std=c99 -D_BSD_SOURCE -fPIC -DPIC ${CFLAGS} ${CPPFLAGS} -c -o $@ $<
@@ -32,7 +33,16 @@ ${LOADER_NAME}: ${LOADER_OBJ}
 	$(CC) -fPIC -DPIC ${CFLAGS} ${CPPFLAGS} -c -o $@ $<
 
 clean:
-	rm -f ${LIBUCONTEXT_NAME} ${LIBUCONTEXT_OBJ}
+	rm -f ${LIBUCONTEXT_NAME} ${LIBUCONTEXT_SONAME} ${LIBUCONTEXT_OBJ}
 
 install: all
 	install -D -m755 ${LIBUCONTEXT_NAME} ${DESTDIR}/${LIBUCONTEXT_PATH}
+	ln -sf ${LIBUCONTEXT_SONAME} ${DESTDIR}/lib/${LIBUCONTEXT_NAME}
+
+check: test_libucontext ${LIBUCONTEXT_SONAME}
+	env LD_LIBRARY_PATH=. ./test_libucontext
+
+test_libucontext: ${LIBUCONTEXT_NAME}
+	$(CC) -std=c99 -D_BSD_SOURCE $@.c -o $@ ${LIBUCONTEXT_NAME}
+
+.PHONY: check

test_libucontext.c

@@ -0,0 +1,54 @@
+/*
+ * libucontext test program based on POSIX example program.
+ * Public domain.
+ */
+
+#include <stdio.h>
+#include <ucontext.h>
+#include <stdint.h>
+#include <string.h>
+
+
+static ucontext_t ctx[3];
+
+
+static void f1 (void) {
+	printf("start f1\n");
+	swapcontext(&ctx[1], &ctx[2]);
+	printf("finish f1\n");
+}
+
+
+static void f2 (void) {
+	printf("start f2\n");
+	swapcontext(&ctx[2], &ctx[1]);
+	printf("finish f2\n");
+}
+
+
+int main (int argc, const char *argv[]) {
+	char st1[8192];
+	char st2[8192];
+
+
+	memset(st1, 'A', sizeof st1);
+	memset(st2, 'B', sizeof st2);
+
+
+	getcontext(&ctx[1]);
+	ctx[1].uc_stack.ss_sp = st1;
+	ctx[1].uc_stack.ss_size = sizeof st1;
+	ctx[1].uc_link = &ctx[0];
+	makecontext(&ctx[1], f1, 0);
+
+
+	getcontext(&ctx[2]);
+	ctx[2].uc_stack.ss_sp = st2;
+	ctx[2].uc_stack.ss_size = sizeof st2;
+	ctx[2].uc_link = &ctx[1];
+	makecontext(&ctx[2], f2, 0);
+
+
+	swapcontext(&ctx[0], &ctx[2]);
+	return 0;
+}