add testcases for shm_{open,unlink}

Reported-by: Mikael Lund Jepsen <mlj@iccc.dk>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

librt/shm.c

@@ -45,6 +45,10 @@ static char* get_shm_name(const char*name)
 	if (i < 0) {
 		free(path);
 		return NULL;
+	} else if (i >= NAME_MAX) {
+		free(path);
+		__set_errno(ENAMETOOLONG);
+		return NULL;
 	}
 #endif
 	return path;

test/librt/Makefile

@@ -0,0 +1,6 @@
+# uClibc shm tests
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+
+include ../Test.mak
+
+LDFLAGS_shmtest := -lrt

test/librt/shmtest.c

@@ -0,0 +1,102 @@
+/* Copyright (C) 2009 Mikael Lund Jepsen <mlj@iccc.dk>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+char shared_name[] = "/sharetest";
+int test_data[11] = {0,1,2,3,4,5,6,7,8,9,10};
+
+int main(void) {
+	int pfds[2];
+	pid_t pid;
+	int fd;
+	int test_data_fails = 0;
+	char *ptest_data;
+	unsigned int i;
+	char buf[30];
+	int rv;
+
+	pipe(pfds);
+
+	switch(pid = fork()) {
+	case -1:
+		perror("fork");
+		exit(1);	/* parent exits */
+
+	case 0:
+		/* Child */
+
+		/* wait for parent */
+		read(pfds[0], buf, 5);
+
+		fd =  shm_open(shared_name, O_RDWR, DEFFILEMODE);
+		if (fd == -1) {
+			perror("CHILD - shm_open(existing):");
+			exit(1);
+		} else {
+			ptest_data = mmap(0, sizeof(test_data), PROT_READ + PROT_WRITE, MAP_SHARED, fd, 0);
+			if (ptest_data != MAP_FAILED) {
+				for (i=0; i < sizeof(test_data); i++) {
+					if (ptest_data[i] != test_data[i]) {
+						printf("%-40s: Offset %d, local %d, shm %d", "Compare memory error", i, test_data[i], ptest_data[i]);
+						test_data_fails++;
+					}
+				}
+				if (test_data_fails == 0)
+					printf("%-40s: %s\n", "Compare memory", "Success");
+
+				munmap(ptest_data, sizeof(test_data));
+			}
+		}
+		exit(0);
+
+	default:
+		/* Parent */
+		fd = shm_open(shared_name, O_RDWR+O_CREAT+O_EXCL, DEFFILEMODE );
+		if (fd == -1) {
+			perror("PARENT - shm_open(create):");
+		} else {
+			if ((ftruncate(fd, sizeof(test_data))) == -1)
+			{
+				printf("%-40s: %s", "ftruncate", strerror(errno));
+				shm_unlink(shared_name);
+				return 0;
+			}
+
+			ptest_data = mmap(0, sizeof(test_data), PROT_READ + PROT_WRITE, MAP_SHARED, fd, 0);
+			if (ptest_data == MAP_FAILED)
+			{
+				perror("PARENT - mmap:");
+				if (shm_unlink(shared_name) == -1) {
+					perror("PARENT - shm_unlink:");
+				}
+				return 0;
+			}
+			for (i=0; i <sizeof(test_data); i++)
+				ptest_data[i] = test_data[i];
+
+			/* signal child */
+			write(pfds[1], "rdy", 5);
+			/* wait for child */
+			wait(&rv);
+
+			/* Cleanup */
+			munmap(ptest_data, sizeof(test_data));
+			if (shm_unlink(shared_name) == -1) {
+				perror("PARENT - shm_unlink:");
+			}
+		}
+	}
+	return 0;
+}