* Added a test application that show that BFS does not care to fill the space

between the former end of the file and the position of a write with zeros
  as required.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36262 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/system/libroot/posix/Jamfile

@@ -2,155 +2,52 @@ SubDir HAIKU_TOP src tests system libroot posix ;
 
 UsePrivateHeaders libroot syslog_daemon ;
 
-SimpleTest abort_test
-	: abort_test.cpp
-;
-
-SimpleTest SyslogTest
-	: SyslogTest.cpp syslog.cpp
-;
-
-SimpleTest clearenv
-	: clearenv.cpp
-;
-
-SimpleTest dirent_test
-	: dirent_test.cpp
-;
-
-SimpleTest flock_test
-	: flock_test.cpp
-;
-
-SimpleTest memalign_test
-	: memalign_test.cpp
-;
-
-SimpleTest mprotect_test
-	: mprotect_test.cpp
-;
-
-SimpleTest realtime_sem_test1
-	: realtime_sem_test1.cpp
-;
 
+# POSIX/libc tests
+SimpleTest abort_test : abort_test.cpp ;
+SimpleTest SyslogTest : SyslogTest.cpp syslog.cpp ;
+SimpleTest clearenv : clearenv.cpp ;
+SimpleTest dirent_test : dirent_test.cpp ;
+SimpleTest flock_test : flock_test.cpp ;
+SimpleTest memalign_test : memalign_test.cpp ;
+SimpleTest mprotect_test : mprotect_test.cpp ;
+SimpleTest realtime_sem_test1 : realtime_sem_test1.cpp ;
+SimpleTest seek_and_write_test : seek_and_write_test.cpp ;
 SimpleTest setpgid_test : setpgid_test.cpp ;
+SimpleTest setjmp_test : setjmp_test.c ;
+SimpleTest setjmp_test2 : setjmp_test2.S ;
+SimpleTest signal_in_allocator_test : signal_in_allocator_test.cpp ;
+SimpleTest signal_in_allocator_test2 : signal_in_allocator_test2.cpp ;
+SimpleTest signal_test : signal_test.cpp ;
+SimpleTest sigsetjmp_test : sigsetjmp_test.c ;
+SimpleTest <test>truncate : truncate.cpp ;
+SimpleTest init_rld_after_fork_test : init_rld_after_fork_test.cpp ;
 
-SimpleTest setjmp_test
+# XSI tests
-	: setjmp_test.c
+SimpleTest xsi_msg_queue_test1 : xsi_msg_queue_test1.cpp ;
-;
+SimpleTest xsi_sem_test1 : xsi_sem_test1.cpp ;
 
-SimpleTest setjmp_test2
+# wide character tests
-	: setjmp_test2.S
+SimpleTest mbtest : mbtest.c ;
-;
+SimpleTest testmb : testmb.c ;
+SimpleTest tst-btowc : tst-btowc.c ;
+SimpleTest tst-fgetws : tst-fgetws.c ;
+SimpleTest tst-getwc : tst-getwc.c ;
+SimpleTest tst-mbrtowc : tst-mbrtowc.c ;
+SimpleTest tst-swprintf : tst-swprintf.c ;
+SimpleTest tst-swscanf : tst-swscanf.c ;
+SimpleTest tst-swscanf2 : tst-swscanf2.c ;
+SimpleTest tst-ungetwc1 : tst-ungetwc1.c ;
+SimpleTest tst-ungetwc2 : tst-ungetwc2.c ;
+SimpleTest tst-wcrtomb : tst-wcrtomb.c ;
+SimpleTest tst-wcsnlen : tst-wcsnlen.c ;
+SimpleTest tst-wcstof : tst-wcstof.c ;
+SimpleTest tst-wprintf : tst-wprintf.c ;
+SimpleTest tst-wprintf2 : tst-wprintf2.c ;
+SimpleTest tst-wscanf : tst-wscanf.c ;
+SimpleTest test_wcfuncs : test_wcfuncs.c ;
+SimpleTest test_wctype : test_wctype.c ;
 
-SimpleTest signal_in_allocator_test
-	: signal_in_allocator_test.cpp
-;
-
-SimpleTest signal_in_allocator_test2
-	: signal_in_allocator_test2.cpp
-;
-
-SimpleTest signal_test
-	: signal_test.cpp
-;
-
-SimpleTest sigsetjmp_test
-	: sigsetjmp_test.c
-;
-
-SimpleTest <test>truncate
-	: truncate.cpp
-;
-
-SimpleTest init_rld_after_fork_test
-	: init_rld_after_fork_test.cpp
-;
-
-SimpleTest xsi_msg_queue_test1
-	: xsi_msg_queue_test1.cpp
-;
-
-SimpleTest xsi_sem_test1
-	: xsi_sem_test1.cpp
-;
-
-SimpleTest mbtest
-	: mbtest.c
-;
-
-SimpleTest testmb
-	: testmb.c
-;
-
-SimpleTest tst-btowc
-	: tst-btowc.c
-;
-
-SimpleTest tst-fgetws
-	: tst-fgetws.c
-;
-
-SimpleTest tst-getwc
-	: tst-getwc.c
-;
-
-SimpleTest tst-mbrtowc
-	: tst-mbrtowc.c
-;
-
-SimpleTest tst-swprintf
-	: tst-swprintf.c
-;
-
-SimpleTest tst-swscanf
-	: tst-swscanf.c
-;
-
-SimpleTest tst-swscanf2
-	: tst-swscanf2.c
-;
-
-SimpleTest tst-ungetwc1
-	: tst-ungetwc1.c
-;
-
-SimpleTest tst-ungetwc2
-	: tst-ungetwc2.c
-;
-
-SimpleTest tst-wcrtomb
-	: tst-wcrtomb.c
-;
-
-SimpleTest tst-wcsnlen
-	: tst-wcsnlen.c
-;
-
-SimpleTest tst-wcstof
-	: tst-wcstof.c
-;
-
-SimpleTest tst-wprintf
-	: tst-wprintf.c
-;
-
-SimpleTest tst-wprintf2
-	: tst-wprintf2.c
-;
-
-SimpleTest tst-wscanf
-	: tst-wscanf.c
-;
-
-SimpleTest test_wcfuncs
-	: test_wcfuncs.c
-;
-
-SimpleTest test_wctype
-	: test_wctype.c
-;
 
 # Tell Jam where to find these sources
 SEARCH on [ FGristFiles

src/tests/system/libroot/posix/seek_and_write_test.cpp

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2010, Axel Dörfler, [email protected].
+ * This file may be used under the terms of the MIT License.
+ */
+
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <algorithm>
+
+
+void
+test_for_content(int fd, off_t start, const char* contents, size_t length)
+{
+	char buffer[4096];
+	while (length > 0) {
+		size_t toRead = std::min(length, sizeof(buffer));
+
+		if (pread(fd, buffer, toRead, start) != (ssize_t)toRead) {
+			perror("reading failed");
+			exit(1);
+		}
+		
+		if (memcmp(contents, buffer, toRead)) {
+			fprintf(stderr, "Contents at %lld differ!\n", start);
+			exit(1);
+		}
+
+		contents += toRead;
+		start += toRead;
+		length -= toRead;
+	}
+}
+
+
+void
+test_for_zero(int fd, off_t start, off_t end)
+{
+	while (start < end) {
+		char buffer[4096];
+		size_t length = std::min((size_t)(end - start), sizeof(buffer));
+		
+		if (pread(fd, buffer, length, start) != (ssize_t)length) {
+			perror("reading failed");
+			exit(1);
+		}
+
+		for (size_t i = 0; i < length; i++) {
+			if (buffer[i] != 0) {
+				fprintf(stderr, "Buffer at %lld is not empty (%#x)!\n",
+					start + i, buffer[i]);
+				exit(1);
+			}
+		}
+
+		start += length;
+	}
+}
+
+
+int
+main(int argc, char** argv)
+{
+	const char* name = "/tmp/seek_and_write";
+	bool prefill = true;
+
+	for (int i = 1; i < argc; i++) {
+		if (argv[i][0] == '-') {
+			if (argv[i][1] == 'n')
+				prefill = false;
+			else {
+				fprintf(stderr, "Unknown option\n");
+				return 1;
+			}
+
+			continue;
+		}
+
+		name = argv[i];
+	}
+
+	int fd = open(name, O_RDWR | O_TRUNC | O_CREAT, 0644);
+	if (fd < 0) {
+		perror("failed to open file");
+		return 1;
+	}
+
+	char buffer[256];
+	for (size_t i = 0; i < 256; i++)
+		buffer[i] = i;
+
+	if (prefill) {
+		// Write test data to file to make sure it's not empty
+
+		for (size_t i = 0; i < 100; i++) {
+			if (write(fd, buffer, sizeof(buffer)) != (ssize_t)sizeof(buffer)) {
+				perror("writing failed");
+				return 1;
+			}
+		}
+	}
+
+	// Truncate it again in order to remove its contents
+
+	ftruncate(fd, 0);
+
+	// Seek past its end, and write something
+
+	pwrite(fd, "---", 3, 100 * 1024);
+	pwrite(fd, "+++", 3, 200 * 1024);
+
+	// Test contents
+	
+	test_for_zero(fd, 0, 100 * 1024);
+	test_for_content(fd, 100 * 1024, "---", 3);
+	test_for_zero(fd, 100 * 1024 + 256, 200 * 1024);
+	test_for_content(fd, 200 * 1024, "+++", 3);
+
+	return 0;
+}