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sanos change log

If you want see the latest changes from the latest unstable version take a look at the CHANGES file. A description of the early history of sanos before version 1.2.4 can be found here.

Version 1.3.3

• GetLogicalDrives() in kernel32 implemented.
• A bug in cmd_ipconfig() in sh.c prevented proper display of network configuration if no DNS servers was configured. This problem has been fixed. (FGA)
• New -a option added to mkdfs to support file lists with alternative files names. This simplifies configurations with both debug and release builds.
• The Visual Studio wizard can now generate a floppy disk boot image configured for the application.
• Shell prompt can be configured by setting the prompt property in the [shell] section of the os.ini file.
• If command line arguments are given to the shell it now executes the built-in command and exits the shell.
• The floppy motor timeout routine now acquires the floppy mutex before turning off the motor in order to prevent race conditions.
• Advanced Power Management (APM) support implemented. The computer can now be powered off after os shutdown. The mode parameter for exitos() can be used to specify the shutdown mode (halt, reboot, poweroff, debug). A shutdown command has been added to the shell. The power status can be retrieved using /proc/apm.
• Added /proc/cpu for CPU information.
• The raise() function now returns an error if the signal number is invalid.
• Breakpoint traps are now sent to the user mode signal handler. This allows breakpoints to be handled by user mode code.
• Signals now exits the currently executing job with the signal number as exit code. However, if the debug flag in the PEB is set the debugger is entered if an unhandled signal is encountered. The debug flag can be set using the debug command in the shell. The debug flag can be configured using the debug property in the [os] section of os.ini. The default value of the debug flag is 0, unless the system is build in debug configuration.
• readv() and writev() implemented in vfs.
• The kernel log is now implemented by the device driver /dev/klog. The kernel log now support ioctl for waiting for new log entries in the kernel log. The kprintf has been extended to support different log levels.
• The syslog interface has been redesigned in to comply with POSIX. The syslog now supports logging to a syslog server by setting the loghost property in the [os] section of os.ini.
• New klog daemon to read entries from the kernel log (/dev/klog) and add them to the system log.
• The sockaddr and sockaddr_in structures has been change to conform to winsock definitions.
• The sleep() function has been renamed to msleep(). A new POSIX conformant sleep function has been added to unistd.h.
• Added sys/time.h header file. Also added tzp parameter to gettimeofday() for POSIX compliance.
• New simple text editor utility (edit.exe) added.
• The syserror() function has been moved from libc.lib to the os.dll as an exported os api call.
• readline() now uses stdin and stdout for input and output.
• Bug in iomux fixed. Now a monitored event signals the iomux and not the associated object.
• Implemented popen() and pclose(). Also added a P_SUSPEND parameter to spawn() to allow new jobs to be started suspended.
• The kernel version information is now kept in a version resource in krnl.dll. The version information is retrieved using the new module version information functions in verinfo.c.
• The build type can now be controlled by compile time switches. The kernel version can be displayed in the Windows Explorer by viewing Properties for krnl.dll and selecting the Version tab.
• User management added to kernel. Each thread is now assigned to a user and a group. A thread has both a real and an effective user and group owner. The {get|set}[e]{uid|gid}() functions can be used to change the effective and real user and group for a thread. When a new thread is created the effective user and group are inherited from the creator thread.
• Added functions to query /etc/passwd and /etc/group files.
• New whoami, id, chmod, and chown commands added to shell. The format of the output from ls has been changed to display the file permission info.
• New file system version for DFS. The new version supports user and group owner for files and directories as well as permission bits. The new DFS version also supports files larger than 2GB. The fchown() and chown() functions has been added to vfs.
• DES-based crypt() implementation added.
• The spawn() function now computes the pgm parameter from the cmdline parameter if the pgm parameter is NULL. The initpgm and initargs properties in the [os] section of /etc/os.ini has been replaced with a single property named init. The default for init has been changed to /bin/sh.
• The behavior of the initial application has been changed. Previously the os shut down after the initial application exited. Now the initial application is executed again if it exits.
• Telnet daemon moved from the shell to separate server (telnetd.exe). The new telnet daemon has a more robust handling of the telnet protocol. The telnet daemon invokes the new login utlity in order to log on user.
• FTP daemon implemented.

Version 1.3.2

• The fdmotor task in the floppy driver has been replaced by a timer.
• Standard POSIX/ANSI API routines now returns -1 on error and set error code in errno to comply with POSIX/ANSI standard.
• Added format option to dfs mount options to allow a device to be formatted when mounting. This is useful for ram disks. Also added progress option to log progress messages during formatting of device.
• The file system now has a separate step for destroying the file object after all locks has been released. This should prevent race condition when reads/writes are pending when the file is closed. This could lead to kernel panic because the file object was destroyed while being accessed in the read/write routines.
• Changed err_tcp() in tcpsock.c to set IOEVT_CLOSE if the error code is ERST. This will trigger a socket in readfds in select() when the connection has been reset by the peer.
• The kernel now uses a dual licensing scheme allowing both BSD and GPL license. The overall kernel license mode can be set by compiling with -D BSD or -D GPL. Individual source files can use these defines for conditional compilation. The /proc/copyright is adjusted to reflect the overall licensing mode of the kernel. The license() kernel api routine can be used in kernel modules for runtime checks of the kernel license mode.
• Suspending all user threads when shutting down.
• Raw sockets implemented.
• Ping command added to shell.
• Header files added for ANSI/POSIX compliance: netdb.h, stdint.h, sys/uio.h, arpa/inet.h, netinet/in.h, netinet/tcp.h, sys/select.h, sys/socket.h.
• Now stat() and fstat() only returns the length of the file if the second argument is NULL. Otherwise, stat() and fstat() returns 0 on success to comply with POSIX.
• The dirent struct renamed to direntry to avoid name clash with POSIX standard. Also, the opendir has been renamed to _opendir, and readdir has been renamed to _readdir.
• Implemented opendir(), readdir(), rewinddir(), and closedir() according to POSIX and added dirent.h include file.
• Implemented alloca() and added alloca.h header file.
• Primary path separator can now be configured in krnl.ini.
• Added realpath() to stdlib.c.
• The Visual Studio Wizard now supports extended project directory structure.
• Project files now uses Release and Debug as configuration instead of SanOS and SanOSDebug.
• Port I/O definitions moved from krnl.h to iop.h.
• load() renamed to dlopen(), unload() renamed to dlclose(), resolve() renamed to dlsym() for POSIX compliance. The dlfcn.h header file added.
• Added CREATE_POSIX flag for beginthread() in order to support POSIX thread function signatures.
• Threads are now being signaled on termination.
• getthreadblock() system call implemented.
• POSIX thread support added. Added sched.c, sched.h, semaphore.c, semaphore.h, pthread.h, pthread.c, mutex.c, condvar.c, barrier.c, rwlock.c, spinlock.c.
• utime.h header moved from include/sys to include.
• uname() implemented and utsname.h header added. uname command implemented in shell.
• chsize{64} renamed to ftruncate{64} and added to unistd.h.
• flush() renamed to fsync() and added to unistd.h.
• Added strtok_r() to string.h.
• Fixed bug in password encoding for smbfs
• Added new API routines to wsock32 and kernel32 to better support java nio.
• Added /proc/screen to capture the contents of the console screen buffer.
• The shell now supports execution of initialization script. The script file is specified using the initcmds property in the [shell] section in os.h. Each line in the file is executed as a shell command. An exec command has been added to the shell to allow execution of script files.
• If no hostname has been configured, the network initialization code now tries to find the hostname for the computer by making a DNS query on the assigned IP address.

Version 1.3.1

• Added hlt to idle task to decrease CPU usage when running under VMWare (TSU).
• Added uk keyboard bindings (TSU).
• The static modifier removed from internal routines in sysapi.c to prevent "over-optimization" of the stack frames (TSU).
• The configuration from /etc/os.ini has been renamed from config to osconfig.
• The add_to_history() function in readline.c is no longer static and now has a prototype in stdlib.h.
• The os.vcproj file has been modified to explicitly set the /GF /Gy /Oi /Ob1 flags. Now the project file is converted correctly to VC7.1 format (TSU).
• VT102 support in console driver.
• Atomic operations added in atomic.h.
• Instance counting added in crt0.c to properly initialize/terminate the crt.
• Guard pages implemented.
• Support for JDK 1.4.2.
• Changed stack guard page support to comply with win32.
• The jinit utility can now load configuration from alternative ini file.
• ifconfig command implemented in shell.
• /proc/dhcpstat implemented.
• Bug in GetFileTimes() fixed.
• _open_osfhandle() in msvcrt leaked file handles. This has been fixed.
• Console input implemented using readline() in msvcrt.
• tempnam() added to stdio.h.
• sys/utime.h added.
• Self handle for thread now stored in TIB.
• Improved C++ compatibility in Standard C library. All function declarations now in extern "C". The standard new and delete operator implemented.
• mkmutex() and mutexrel() implemented.
• pread() and pwrite() implemented.
• Intrinsic math functions implemented (acos, asin, cosh, pow, sinh, tanh).

Version 1.3.0

• cd support added to ide driver.
• cdfs iso9660 filesystem implemented.
• SetFilePointer() implemented in kernel32.
• kbhit() and putch() implemented in conio.c.
• setjmp() did not return the correct value from longjmp(). This problem has been fixed.
• Intrinsic fmod function (_CIfmod) implemented.
• The stdin, stdout and stderr macros in stdio.h required os.h to be included to define the job structure. This is no longer needed. The standard files are now resolved using the __stdhndl() function in the stdio library.
• mode parameter added to mkdir() for ANSI conformance.
• chmod() and fchmod() system calls implemented. No file systems yet implement these.
• The user time for /proc/loadavg was counted as dpc time. This problem has been fixed.
• sysinfo() implemented. GetSystemInfo() and GlobalMemoryStatus() in kernel32 now returns correct values.
• Code cleanup in msvcrt.h. All exports moved to msvcrt.def.
• TCP keep-alive packets was not acknowledged correctly. This could lead to connections where the peer had KEEPALIVE enabled to be terminated after long periods of no activity. This problem has been fixed by also sending an acknowledge for TCP segments that fall outside the current window.
• Changes from lwIP 0.6.4 added to networking code:
• Check for short packets in icmp.
• ICMP transmit buffer changed to PBUF_IP.
• ip_id in ip_output_if() changed to static.
• Checksum folded into 16-bit in chksum().
• The TCP retransmission time-out backoff corrected.
• Segments in ooseq, unacked and unsent are now removed on abort.
• Check for pcb already in listen mode in tcp_listen().
• TCP retransmission of unacknowled segments moved to tcp_rexmit().
• The snd_wl1 was not initialized correctly.
• If accept fails in SYN_RECVD, EABORT is retuned to prevent further processing of pcb.
• Segments on unacked now removed before segments on the unsent list.
• Now also sending an acknowledge for TCP segments that fall outside the current window.
• Only direct UDP packets which does not match perfectly to unconnected pcbs.
• Check for short packets in udp.
• Support for kernel options supplied by the loader added. The kernel options are embedded in the loader. The mkdfs utility now have a -K option to set kernel options for a bootable image. The setup utility has been updated to allow kernel options to be specified in the sysprep section.
• The ide device driver now supports the ideprobe kernel option to disable probing of ide devices. When ideprobe=0 the BIOS settings are used to determine the number of disks.
• Renamed format() syscall to mkfs().
• Boot from CD-ROM using El Torito implemented. The system is booted in No Emulation mode. The BOOTIMG.BIN contains a small DFS filesystem (512K). A special boot sector (cdboot) loads the secondary boot loader (osldr) from the image and starts it using boot drive 0xFF. The secondary bootloader has been relocated to 0x00090000 to allow the boot image to fit into low memory. It loads the kernel from the boot image and starts the kernel. The kernel boots the system using the boot image (/dev/initrd) as root file system. The rest of the CD is mouted on /usr to allow access to the entire CD. The boot ISO image can be created using the mkisofs tool.
• Boot from network using PXE implemented.
• Escape character changed from '\' to '^' in .ini files.
• The hd driver failed to read multiple sectors per read command. This problem has been fixed. The status register is now read before the next sector is read in the dpc handler. This reenables interrupts from the IDE controller before the last byte of the current sector is read.
• UDMA mode disabled in IDE driver for VMware disk drives.
• File objects are now I/O objects. This is the first step in enabling selectable file handles, i.e. allow for using select() on file handles. While this is not very useful for regular files it is interesting for devices and pipes.
• Support for select() for device drivers implemented in device manager. Device drivers must call dev_setevt() and dev_clrevt() to signal events. A flag parameter has been added to dev_read() and dev_write(). This parameter is used to indicate non-blocking I/O operations (DEVFLAG_NBIO).
• Support for select() and non-blocking I/O for pipe file system. O_NONBLOCK added to flags in open() and ioctl() support for FIONBIO for file objects.
• Added job list to PEB. The jobs command in the shell can now be used to display all running jobs.
• The kernel startup has been changed to open only one file object for the console. Then three handles are allocated for the initial stdin, stdout and stderr.
• The get_option() routine failed to handle parameters without values. This problem has been fixed.
• system() now uses spawn() to execute new program.
• Enabled cursor on console when kbhit() is called.
• Real mode os loader initialization implemented as DOS stub for osldr.dll. Now the boot sector calls the real mode entry point in real mode. The real mode startup initializes the system, enters 32-bit protected mode and calls the protected mode startup routine in osldr.dll. This simplifies the boot loaders and removes the 512 byte limitation on real mode initialization code.
• Support for compressed boot image for initial RAM disk.

Version 1.2.9

• New mkfloppy utility for writing raw floppy disks.
• TCP connections are now reset before kernel shutdown or reboot.
• Serial transmitter could hang. Interrupts are now disabled when draining the transmit queue to prevent race condition with interrupt service routine. The transmitter is now started directly by the write routine. Previously the transmitter was started by the DPC. The interrupt service routines now also checks for multiple interrupt indications per interrupt.
• New Visual Studio wizard for creating sanos application projects.
• Scheduler enhancements:
  • Number of thread priorities changed from 8 to 32.
  • Scheduler now uses a thread ready summary to determine next thread to run.
  • Win32 thread priority mapping changed to new 32 level priority system based on normal priority class mapping.
  • User mode code only allowed to set priority levels 1-15.
  • User mode code not allowed to change priority for kernel threads.
  • Dynamic and base priority for threads implemented.
  • Priority boosting implemented.
  • Quantum units are now charged after restarting waiting thread.
  • Preemption when threads with higher priority than running thread ready implemented
• TCP port numbers initialized on startup to random value in range 4096-5120.
• Processor load information (/proc/loadavg) implemented.
• Shell code cleaned up. Help texts added. Better argument checking.
• Buffer overflows fixed in module loader.
• Send and receive timeouts (SO_SNDTIMEO and SO_RCVTIMEO in setsockopt()) implemented for TCP sockets.

Version 1.2.8

• Garbage was outputted when printing negative numbers using printf. This problem has been fixed.
• lseek() failed with -EINVAL when seeking on a device larger than 2GB. This prevented fdisk from working on disks larger than 2GB. This problem has been fixed.
• The fddone flag in bootfd.c has been marked volatile to prevent optimization of interrupt wait loop.

Version 1.2.7

• When a file or socket object was closed the kernel object was accessed in hfree() after being freed. The file and socket objects are now freed in destroy_object() to avoid this problem.
• Handles to kernel objects was not removed from the handle table if the handle count was greater than one. This problem has been fixed.
• Closing a socket now sends a IOEVT_CLOSE event to attached iomux. This signals a select() on a socket to return when one of the read sockets are being closed by the application.
• File was marked as modified when using futime() with dfs. This was overwriting the mtime for the inode when the file was closed. Now the inode is just marked dirty.
• Floppy device was not detected unless floppy disk was inserted. This problem has been fixed by delaying initialization of fdc until first use.
• Added queue to loopback adapter.
• The yield() routine now discards the remaining quantum for the thread before yielding.
• Loopback packets to own address are now redirected in ether_output().
• In syscall() in kernel the error code from system calls was set in the err field in the tib. This overwrote the stderr handle for the thread. Now the errnum field is correctly set in the tib.
• Garbage returned by WSAGetLastError() because tib->err was mistakenly used instead of tib->errnum. This has been fixed.
• The value of errno is now the positive version of the error number instead of the negative.
• dup2(), creat(), sopen(), umask(), eof(), and access() added.
• File sharing, permission mode and additional open flags (O_TEMPORARY, O_SHORT_LIVED, O_DIRECT, O_SEQUENTIAL, O_RANDOM) implemented for smbfs.
• Temporary files added to dfs (O_TEMPORARY flag in open()).
• tell() did not correctly return the file position. It just flushed the file. This has been fixed and tell() now returns the file position.
• vfs and smbfs now supports large files (>2GB).
• stat64(), fstat64(), tell64(), lseek64() and chsize64() added to os interface.
• stat() and fstat() changed to conform to ANSI standard.
• Modified signal() and raise() to conform to ANSI standard. Signal info can be obtained in signal handler by using getsiginfo(). The sendsig() function can be used to raise signals with context info.
• Support for 64 bit integer arithmetic. All compiler support routines for 64 bit integer operations implemented in libc.
• CreateFile() and SetFileTime() implemented in kernel32.
• WIN32 structured exception handling implemented in kernel32. When kernel32 is loaded it takes over the global signal handler and dispatches the exceptions in the exception chain in the TIB.
• MSVCRT exception handling implemented.
• setcontext() implemented.
• Added more complete ANSI Standard C Library. Many standard header files has been added to the include directory (conio.h, errno.h, fcntl.h, float.h, io.h, malloc.h, math.h, memory.h, process.h, share.h, signal.h, stddef.h, sys/types.h, unistd.h), and prototypes has been moved to their ANSI specified standard headers.
• The thread ready queues could become corrupted if a thread that was already ready was marked ready again. This could lead to kernel traps in the object manager because of faulty dispatching of threads. This problem has been fixed, by linking the threads on the ready queues in double linked lists and introducing new thread states. Now only threads in ready state are in the ready queues.
• Added job object to group threads executing an application. The CREATE_NEW_JOB flags can be used in beginthread() to start a new job. The spawn() function can be used to start an application in a new job.
• /dev/random and /dev/urandom devices added.
• BSD style random number functions added to lib.
• New stdio implementation with buffering, unget, and support for printf and scanf processing.
• C/C++ initializes and terminators are now processed by the crt startup/shutdown code include atexit() handlers.
• Math routines using the i387 instruction set added to standard C library (acos, asin, atan, atan2, ceil, cos, cosh, exp, fabs, floor, fmod, frexp, ldexp, log, log10, modf, pow, sin, sinh, sqrt, tan, tanh).
• abort() now raises SIGABRT.
• div(), labs(), ldiv(), and system() added to stdlib.c.
• memccpy(), memicmp(), strset() added to string.c.
• strtod() and atof() implemented.
• asctime(), _ctime(), _strdate(), _strtime() added to time.c.
• /proc/bufstat added to buffer cache manager to show statistic for the buffer cache.
• Previously exit() stopped the user mode code and shutdown the kernel. The exit() routine now exits the currently executing job. The exitos() routine now shuts down the kernel.
• Support for O_TEXT and O_BINARY flags added to vsf.c.
• connect() failed for local sockets. This problem has been fixed.
• calloc() reported out of memory if num was zero. This problem has been fixed.

Version 1.2.6

• iomux did not work with IOEVT_WRITE. This problem has been fixed.
• getsockname() returned garbage in sin_port and sin_addr. This problem has been fixed.
• getpeername() returned garbage in sin_addr. This problem has been fixed.
• New HTTP server implemented (httpd.dll).
• PE resource API implemented.
• Threads are now rescheduled after setprio() to immediately reflect the new thread priority.
• New sis900 network driver implemented (sis900.sys).
• ls reported wrong size for files larger than 1GB. This problem has been fixed.
• NIC support for multicast filtering. Implemented in sis900 and rtl8139. Not yet implemented in network stack.
• /dev/cmos renamed to /dev/nvram.
• ether_crc() moved to src\net\ether.c.
• struct stats_nic moved to include\net\stats.h.
• lookup_board() implemented in dev.c.
• pci_{read|write}_config_{byte|word|dword} implemented in pci.c.
• Proper handling of kernel traps. Now enters debugger with correct exception.

Version 1.2.5

• iomux kernel synchronization objects implemented.
• select() implemented.
• Support for building with Visual Studio 6.
• setjmp/longjmp moved from msvcrt to libc.
• Exceptions with signal() and raise() implemented.
• Revalidate partition drivers after fdisk.
• Bug in FPU context handling fixed.
• strftime() implemented.
• Bug loading DLL with no imports fixed.
• recv() call hangs when reading from a TCP socket which have been closed by remote peer. This problem has been fixed. recv() now returns -ECONNRESET.

Version 1.2.4

• Implemented /proc/uptime to display time since boot up.
• Added readline() with command line editing, command history and filename completion.
• Support for .exe applications in msvcrt.dll.
• Script action moved to script section in setup.exe.
• Removed safety pool code in pframe.c.
• Added tags to page frame database to identify memory usage.
• Added /proc/memusage.
• Renamed /os to /bin
• SO_BROADCAST implemented.
• Mapping of network errors to winsock error codes.
• Implemented main entry in libc with parseargs.
• Fixed bug in TCP retransmission.
• Made ne2000 driver work with WAFER.
• Return info on WSAStartup.
• Moved netif binding to os.c
• Reading netif parameters from [netif] in os.ini to allow static configuration of ip address and dns servers.
• Added disabled netif for all packet devices on startup.
• Added ioctl() support for changing netif parameters.
• Added alloc_linear_pageframes() and alloc_pages_linear() for allocating linear physical memory blocks.
• RTL8139 network driver implemented (rtl8139.sys).
• Added PCI subsystem identifier to driver binding code.
• Implemented Intel EtherExpress Pro100 NIC network driver (eepro100.sys)
• Implemented lock count on objects. Objects are closed when handle count reaches zero, and objects are destroyed when handle count and refcnt reaches zero.
• Buffer leak in devfs set_inode_block() fixed.
• Support for lseek() beyond end of file in dfs and smbfs.
• Bug in register_interrupt_handler() caused kernel to hang on startup. This problem has been fixed.
• Support for LBA mode for hd boot in osldr.
• Keyboard interrupt handling has been made more robust (failed on xpc).
• sendmsg() and recvmsg() added.