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217 | -- Copyright (C)2020-2023, Philip Munts dba Munts Technologies.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- * Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
-- String actual parameters *MUST* be NUL terminated, e.g. "FOO" & ASCII.NUL
WITH Interfaces.C;
USE TYPE Interfaces.C.int;
PACKAGE BODY Posix IS
PROCEDURE Open
(filename : String;
flags : Natural;
mode : Natural;
fd : OUT Integer;
error : OUT Integer) IS
BEGIN
fd := Integer(C_open(Interfaces.C.To_C(filename), Interfaces.C.int(flags),
Interfaces.C.int(mode)));
IF fd < 0 THEN
error := Posix.errno;
ELSE
error := 0;
END IF;
END Open;
PROCEDURE Open_Read
(filename : String;
fd : OUT Integer;
error : OUT Integer) IS
BEGIN
Open(filename, Posix.O_RDONLY, 0, fd, error);
END Open_Read;
PROCEDURE Open_Write
(filename : String;
fd : OUT Integer;
error : OUT Integer) IS
BEGIN
Open(filename, Posix.O_WRONLY, 0, fd, error);
END Open_Write;
PROCEDURE Open_ReadWrite
(filename : String;
fd : OUT Integer;
error : OUT Integer) IS
BEGIN
Open(filename, Posix.O_RDWR, 0, fd, error);
END Open_ReadWrite;
PROCEDURE Close
(fd : Integer;
error : OUT Integer) IS
BEGIN
IF C_close(Interfaces.C.int(fd)) = 0 THEN
error := 0;
ELSE
error := errno;
END IF;
END Close;
PROCEDURE Read
(fd : Integer;
buf : System.Address;
len : Integer;
count : OUT Natural;
error : OUT Integer) IS
status : Posix.ssize_t;
BEGIN
status := C_read(Interfaces.C.int(fd), buf, Interfaces.C.size_t(len));
IF status < 0 THEN
count := 0;
error := Posix.errno;
ELSE
count := Natural(status);
error := 0;
END IF;
END Read;
PROCEDURE Write
(fd : Integer;
buf : System.Address;
len : Integer;
count : OUT Natural;
error : OUT Integer) IS
status : Posix.ssize_t;
BEGIN
status := C_write(Interfaces.C.int(fd), buf, Interfaces.C.size_t(len));
IF status < 0 THEN
count := 0;
error := Posix.errno;
ELSE
count := Natural(status);
error := 0;
END IF;
END Write;
PROCEDURE Poll
(files : fds_array;
events : events_array;
revents : OUT events_array;
timeoutms : Natural;
error : OUT Integer) IS
pollfds : ARRAY (1 .. files'Length) OF Posix.pollfd;
status : Interfaces.C.int;
BEGIN
FOR i IN pollfds'Range LOOP
pollfds(i).fd := Interfaces.C.int(files(i));
pollfds(i).events := Interfaces.C.short(events(i));
pollfds(i).revents := 0;
END LOOP;
status := Posix.C_poll(pollfds'Address, pollfds'Length, Interfaces.C.int(timeoutms));
IF status < 0 THEN
revents := (OTHERS => 0);
error := errno;
ELSIF status = 0 THEN
revents := (OTHERS => 0);
error := ETIMEOUT;
ELSE
FOR i IN pollfds'Range LOOP
revents(i) := Natural(pollfds(i).revents);
END LOOP;
error := 0;
END IF;
END Poll;
PROCEDURE Poll
(fd : Integer;
events : Natural;
revents : OUT Natural;
timeoutms : Natural;
error : OUT Integer) IS
pollfds : ARRAY (1 .. 1) OF Posix.pollfd;
status : Interfaces.C.int;
BEGIN
pollfds(1).fd := Interfaces.C.int(fd);
pollfds(1).events := Interfaces.C.short(events);
pollfds(1).revents := 0;
status := Posix.C_poll(pollfds'Address, pollfds'Length, Interfaces.C.int(timeoutms));
IF status < 0 THEN
revents := 0;
error := errno;
ELSIF status = 0 THEN
revents := 0;
error := ETIMEOUT;
ELSE
revents := Natural(pollfds(1).revents);
error := 0;
END IF;
END Poll;
PROCEDURE Poll
(fd : Integer;
timeoutms : Natural;
error : OUT Integer) IS
revents : Natural := 0;
BEGIN
Poll(fd, POLLIN, revents, timeoutms, error);
END Poll;
FUNCTION errno RETURN Integer IS
BEGIN
RETURN Integer(C_errno);
END errno;
FUNCTION strerror(err : Integer) RETURN String IS
msg : Interfaces.C.char_array(0 .. 255);
BEGIN
C_strerror_r(Interfaces.C.int(err), msg, msg'Length);
RETURN Interfaces.C.To_Ada(msg);
END strerror;
END Posix;
|