ikarus/src/ikarus-io.c

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/*
* Ikarus Scheme -- A compiler for R6RS Scheme.
* Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netdb.h>
#include "ikarus-data.h"
ikptr
ikrt_io_error(){
switch(errno){
case EBADF : return fix(-2);
case EINTR : return fix(-3);
case ENOTDIR : return fix(-4);
case ENAMETOOLONG : return fix(-5);
case ENOENT : return fix(-6);
case EACCES : return fix(-7);
case ELOOP : return fix(-8);
case EISDIR : return fix(-9);
case EROFS : return fix(-10);
case EMFILE : return fix(-11);
case ENFILE : return fix(-12);
case ENXIO : return fix(-13);
case EOPNOTSUPP : return fix(-14);
case ENOSPC : return fix(-15);
case EDQUOT : return fix(-16);
case EIO : return fix(-17);
case ETXTBSY : return fix(-18);
case EFAULT : return fix(-19);
case EEXIST : return fix(-20);
case EINVAL : return fix(-21);
case EAGAIN : return fix(-22); /* hardcoded in ikarus.io.ss */
case EPIPE : return fix(-23);
}
return fix(-1);
}
ikptr
ikrt_close_fd(ikptr fd, ikpcb* pcb){
int err = close(unfix(fd));
if(err == -1){
return ikrt_io_error();
} else {
return false_object;;
}
}
ikptr
ikrt_open_input_fd(ikptr fn, ikpcb* pcb){
int fh = open((char*)(long)(fn+off_bytevector_data), O_RDONLY, 0);
if(fh > 0){
return fix(fh);
} else {
return ikrt_io_error();
}
}
ikptr
ikrt_open_output_fd(ikptr fn, ikptr ikopts, ikpcb* pcb){
int opts = unfix(ikopts);
int mode = 0;
switch (opts){
/* mode 0: error if exists, create if does not exist */
case 0: mode = O_WRONLY | O_CREAT | O_EXCL; break;
/* mode 1: truncate if exists, error if not exists */
case 1: mode = O_WRONLY | O_TRUNC; break;
/* mode 2: truncate if exists, create if not exist */
case 2: mode = O_WRONLY | O_TRUNC | O_CREAT ; break;
/* mode 3: truncate if exists, error if not exists */
case 3: mode = O_WRONLY | O_TRUNC ; break;
case 4: mode = O_WRONLY | O_CREAT | O_EXCL ; break;
case 5: mode = O_WRONLY | O_CREAT ; break;
case 6: mode = O_WRONLY | O_CREAT ; break;
case 7: mode = O_WRONLY ; break;
}
int fh = open((char*)(long)(fn+off_bytevector_data),
mode,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if(fh > 0){
return fix(fh);
} else {
return ikrt_io_error();
}
}
ikptr
ikrt_read_fd(ikptr fd, ikptr bv, ikptr off, ikptr cnt, ikpcb* pcb){
ssize_t bytes =
read(unfix(fd),
(char*)(long)(bv+off_bytevector_data+unfix(off)),
unfix(cnt));
if(bytes >= 0){
return fix(bytes);
} else {
return ikrt_io_error();
}
}
ikptr
ikrt_write_fd(ikptr fd, ikptr bv, ikptr off, ikptr cnt, ikpcb* pcb){
ssize_t bytes =
write(unfix(fd),
(char*)(long)(bv+off_bytevector_data+unfix(off)),
unfix(cnt));
if(bytes >= 0){
return fix(bytes);
} else {
return ikrt_io_error();
}
}
ikptr
ikrt_tcp_connect(ikptr host, ikptr srvc, ikpcb* pcb){
struct addrinfo* info;
int err = getaddrinfo((char*)(long)(host+off_bytevector_data),
(char*)(long)(srvc+off_bytevector_data),
0,
&info);
if(err){
return fix(-1);
}
struct addrinfo* i = info;
int sock = -1;
while(i){
if(i->ai_socktype != SOCK_STREAM){
i = i->ai_next;
} else {
int s = socket(i->ai_family, i->ai_socktype, i->ai_protocol);
if(s < 0){
i = i->ai_next;
} else {
int err = connect(s, i->ai_addr, i->ai_addrlen);
if(err < 0){
i = i->ai_next;
} else {
sock = s;
i = 0;
}
}
}
}
freeaddrinfo(info);
return fix(sock);
}
ikptr
ikrt_tcp_connect_nonblocking(ikptr host, ikptr srvc, ikpcb* pcb){
ikptr fdptr = ikrt_tcp_connect(host, srvc, pcb);
int fd = unfix(fdptr);
if(fd >= 0){
/* connected alright */
int err = fcntl(fd, F_SETFL, O_NONBLOCK);
if(err == -1){
ikptr errptr = ikrt_io_error();
close(fd);
return errptr;
}
}
return fdptr;
}