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Document "GUILE_LOAD_PATH" change.
Give more details about the deleted header files, and functions. Clarify explanation of build-guile. Make all the syscall changes subheadings of "Changes to Scheme functions and syntax".
This commit is contained in:
Jim Blandy
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1 changed files with 61 additions and 47 deletions
108
NEWS
108
NEWS
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@ -8,9 +8,24 @@ Changes since Guile 1.2:
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* Changes to the distribution
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** libguile/append.h, libguile/append.c, libguile/extchrs.h,
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libguile/extchrs.c, libguile/mbstrings.h libguile/mbstrings.c,
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libguile/sequences.h, libguile/sequences.c removed.
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** We renamed the SCHEME_LOAD_PATH environment variable to GUILE_LOAD_PATH.
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To avoid conflicts, programs should name environment variables after
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themselves, except when there's a common practice establishing some
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other convention.
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For now, Guile supports both GUILE_LOAD_PATH and SCHEME_LOAD_PATH,
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giving the former precedence, and printing a warning message if the
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latter is set. Guile 1.4 will not recognize SCHEME_LOAD_PATH at all.
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** The header files related to multi-byte characters have been removed.
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They were: libguile/extchrs.h and libguile/mbstrings.h. Any C code
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which referred to these explicitly will probably need to be rewritten,
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since the support for the variant string types has been removed; see
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below.
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** The header files append.h and sequences.h have been removed. These
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files implemented non-R4RS operations which would encourage
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non-portable programming style and less easy-to-read code.
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* Changes to the stand-alone interpreter
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@ -41,15 +56,8 @@ mirror site; the canonical location is "ftp://prep.ai.mit.edu/pub/gnu".
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Guile now includes a command-line utility called 'build-guile', which
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writes to its standard output a list of flags which you must pass to
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the linker to link against the Guile library. The flags include
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'-lguile' itself.
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This is necessary because the Guile library may depend on other
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libraries for networking functions, thread support, and so on. To
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link your program against libguile, you must link against these
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libraries as well. The exact set of libraries depends on the type of
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system you are running, and what you have installed on it. The
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'build-guile' command uses information recorded in libguile itself to
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determine which libraries you must link against.
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'-lguile' itself, and any other libraries the Guile library depends
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upon.
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For example, here is a Makefile rule that builds a program named 'foo'
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from the object files ${FOO_OBJECTS}, and links them against Guile:
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@ -57,11 +65,17 @@ from the object files ${FOO_OBJECTS}, and links them against Guile:
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foo: ${FOO_OBJECTS}
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${CC} ${CFLAGS} ${FOO_OBJECTS} `build-guile link` -o foo
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Previous Guile releases recommended that you use autoconf to detect
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which of a predefined set of libraries were present on your system.
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It is more robust to use build-guile, since it records exactly which
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libraries the installed Guile library requires.
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* Changes to Scheme functions and syntax
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** Multi-byte strings have been removed, as have multi-byte and wide
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ports.
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ports. We felt that these were the wrong approach to
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internationalization support.
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** New function: readline [PROMPT]
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Read a line from the terminal, and allow the user to edit it,
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@ -169,55 +183,47 @@ Macro: with-fluids ((FLUID VALUE) ...) FORM ...
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fluids are not special variables but ordinary objects. FLUID
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should evaluate to a fluid.
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** Removed procedures:
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** Changes to system call interfaces:
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list-length, list-append, list-append!, list-reverse, list-reverse!
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** array-map renamed to array-map!
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** serial-array-map renamed to serial-array-map!
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* Changes to system call interfaces:
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** close-port, close-input-port and close-output-port now return a
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*** close-port, close-input-port and close-output-port now return a
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boolean instead of an `unspecified' object. #t means that the port
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was successfully closed, while #f means it was already closed. It is
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also now possible for these procedures to raise an exception if an
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error occurs (some errors from write can be delayed until close.)
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** the first argument to chmod, fcntl, ftell and fseek can now be a
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*** the first argument to chmod, fcntl, ftell and fseek can now be a
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file descriptor.
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** the third argument to fcntl is now optional.
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*** the third argument to fcntl is now optional.
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** the first argument to chown can now be a file descriptor or a port.
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*** the first argument to chown can now be a file descriptor or a port.
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** the argument to stat can now be a port.
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*** the argument to stat can now be a port.
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** The following new procedures have been added (most use scsh
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*** The following new procedures have been added (most use scsh
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interfaces):
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** procedure: close PORT/FD
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*** procedure: close PORT/FD
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Similar to close-port (*note close-port: Closing Ports.), but also
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works on file descriptors. A side effect of closing a file
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descriptor is that any ports using that file descriptor are moved
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to a different file descriptor and have their revealed counts set
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to zero.
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** procedure: port->fdes PORT
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*** procedure: port->fdes PORT
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Returns the integer file descriptor underlying PORT. As a side
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effect the revealed count of PORT is incremented.
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** procedure: fdes->ports FDES
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*** procedure: fdes->ports FDES
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Returns a list of existing ports which have FDES as an underlying
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file descriptor, without changing their revealed counts.
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** procedure: fdes->inport FDES
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*** procedure: fdes->inport FDES
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Returns an existing input port which has FDES as its underlying
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file descriptor, if one exists, and increments its revealed count.
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Otherwise, returns a new input port with a revealed count of 1.
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** procedure: fdes->outport FDES
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*** procedure: fdes->outport FDES
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Returns an existing output port which has FDES as its underlying
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file descriptor, if one exists, and increments its revealed count.
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Otherwise, returns a new output port with a revealed count of 1.
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@ -231,24 +237,24 @@ type of value returned varies depending on which procedure is used.
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any ports using NEWFD are moved to a different file descriptor and have
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their revealed counts set to zero.
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** procedure: dup->fdes PORT/FD [NEWFD]
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*** procedure: dup->fdes PORT/FD [NEWFD]
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Returns an integer file descriptor.
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** procedure: dup->inport PORT/FD [NEWFD]
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*** procedure: dup->inport PORT/FD [NEWFD]
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Returns a new input port using the new file descriptor.
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** procedure: dup->outport PORT/FD [NEWFD]
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*** procedure: dup->outport PORT/FD [NEWFD]
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Returns a new output port using the new file descriptor.
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** procedure: dup PORT/FD [NEWFD]
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*** procedure: dup PORT/FD [NEWFD]
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Returns a new port if PORT/FD is a port, with the same mode as the
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supplied port, otherwise returns an integer file descriptor.
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** procedure: dup->port PORT/FD MODE [NEWFD]
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*** procedure: dup->port PORT/FD MODE [NEWFD]
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Returns a new port using the new file descriptor. MODE supplies a
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mode string for the port (*note open-file: File Ports.).
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** procedure: setenv NAME VALUE
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*** procedure: setenv NAME VALUE
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Modifies the environment of the current process, which is also the
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default environment inherited by child processes.
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@ -258,7 +264,7 @@ their revealed counts set to zero.
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The return value is unspecified.
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** procedure: truncate-file OBJ SIZE
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*** procedure: truncate-file OBJ SIZE
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Truncates the file referred to by OBJ to at most SIZE bytes. OBJ
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can be a string containing a file name or an integer file
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descriptor or port open for output on the file. The underlying
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@ -266,7 +272,7 @@ their revealed counts set to zero.
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The return value is unspecified.
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** procedure: setvbuf PORT MODE [SIZE]
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*** procedure: setvbuf PORT MODE [SIZE]
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Set the buffering mode for PORT. MODE can be:
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`_IONBF'
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non-buffered
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@ -286,16 +292,16 @@ their revealed counts set to zero.
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size. Procedures e.g., *Note open-file: File Ports, which accept a
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mode string allow `0' to be added to request an unbuffered port.
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** procedure: fsync PORT/FD
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*** procedure: fsync PORT/FD
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Copies any unwritten data for the specified output file descriptor
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to disk. If PORT/FD is a port, its buffer is flushed before the
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underlying file descriptor is fsync'd. The return value is
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unspecified.
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** procedure: open-fdes PATH FLAGS [MODES]
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*** procedure: open-fdes PATH FLAGS [MODES]
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Similar to `open' but returns a file descriptor instead of a port.
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** procedure: execle PATH ENV [ARG] ...
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*** procedure: execle PATH ENV [ARG] ...
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Similar to `execl', but the environment of the new process is
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specified by ENV, which must be a list of strings as returned by
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the `environ' procedure.
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@ -304,15 +310,15 @@ their revealed counts set to zero.
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call, but we call it `execle' because of its Scheme calling
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interface.
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** procedure: strerror ERRNO
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*** procedure: strerror ERRNO
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Returns the Unix error message corresponding to ERRNO, an integer.
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** procedure: primitive-exit [STATUS]
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*** procedure: primitive-exit [STATUS]
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Terminate the current process without unwinding the Scheme stack.
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This is would typically be useful after a fork. The exit status
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is STATUS if supplied, otherwise zero.
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** procedure: times
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*** procedure: times
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Returns an object with information about real and processor time.
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The following procedures accept such an object as an argument and
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return a selected component:
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@ -337,6 +343,14 @@ their revealed counts set to zero.
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Similarly, the CPU times units used by the system on behalf of
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terminated child processes.
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** Removed: list-length
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** Removed: list-append, list-append!
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** Removed: list-reverse, list-reverse!
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** array-map renamed to array-map!
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** serial-array-map renamed to serial-array-map!
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* Changes to the gh_ interface
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** Function: void gh_write (SCM x)
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