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/** \file io.c
Utilities for io redirection.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#ifdef HAVE_SYS_TERMIOS_H
#include <sys/termios.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#if HAVE_NCURSES_H
#include <ncurses.h>
#else
#include <curses.h>
#endif
#if HAVE_TERMIO_H
#include <termio.h>
#endif
#if HAVE_TERM_H
#include <term.h>
#elif HAVE_NCURSES_TERM_H
#include <ncurses/term.h>
#endif
#include "fallback.h"
#include "util.h"
#include "wutil.h"
#include "exec.h"
#include "common.h"
#include "io.h"
#include "halloc.h"
void io_buffer_read( io_data_t *d )
{
exec_close(d->param1.pipe_fd[1] );
if( d->io_mode == IO_BUFFER )
{
/* if( fcntl( d->param1.pipe_fd[0], F_SETFL, 0 ) )
{
wperror( L"fcntl" );
return;
} */
debug( 4, L"io_buffer_read: blocking read on fd %d", d->param1.pipe_fd[0] );
while(1)
{
char b[4096];
int l;
l=read_blocked( d->param1.pipe_fd[0], b, 4096 );
if( l==0 )
{
break;
}
else if( l<0 )
{
/*
exec_read_io_buffer is only called on jobs that have
exited, and will therefore never block. But a broken
pipe seems to cause some flags to reset, causing the
EOF flag to not be set. Therefore, EAGAIN is ignored
and we exit anyway.
*/
if( errno != EAGAIN )
{
debug( 1,
_(L"An error occured while reading output from code block on file descriptor %d"),
d->param1.pipe_fd[0] );
wperror( L"io_buffer_read" );
}
break;
}
else
{
b_append( d->param2.out_buffer, b, l );
}
}
}
}
io_data_t *io_buffer_create( int is_input )
{
io_data_t *buffer_redirect = malloc( sizeof( io_data_t ));
buffer_redirect->io_mode=IO_BUFFER;
buffer_redirect->next=0;
buffer_redirect->param2.out_buffer= malloc( sizeof(buffer_t));
buffer_redirect->is_input = is_input;
b_init( buffer_redirect->param2.out_buffer );
buffer_redirect->fd=is_input?0:1;
if( exec_pipe( buffer_redirect->param1.pipe_fd ) == -1 )
{
debug( 1, PIPE_ERROR );
wperror (L"pipe");
free( buffer_redirect->param2.out_buffer );
free( buffer_redirect );
return 0;
}
else if( fcntl( buffer_redirect->param1.pipe_fd[0],
F_SETFL,
O_NONBLOCK ) )
{
debug( 1, PIPE_ERROR );
wperror( L"fcntl" );
free( buffer_redirect->param2.out_buffer );
free( buffer_redirect );
return 0;
}
return buffer_redirect;
}
void io_buffer_destroy( io_data_t *io_buffer )
{
/**
If this is an input buffer, then io_read_buffer will not have
been called, and we need to close the output fd as well.
*/
if( io_buffer->is_input )
{
exec_close(io_buffer->param1.pipe_fd[1] );
}
exec_close( io_buffer->param1.pipe_fd[0] );
/*
Dont free fd for writing. This should already be free'd before
calling exec_read_io_buffer on the buffer
*/
b_destroy( io_buffer->param2.out_buffer );
free( io_buffer->param2.out_buffer );
free( io_buffer );
}
io_data_t *io_add( io_data_t *list, io_data_t *element )
{
io_data_t *curr = list;
if( curr == 0 )
return element;
while( curr->next != 0 )
curr = curr->next;
curr->next = element;
return list;
}
io_data_t *io_remove( io_data_t *list, io_data_t *element )
{
io_data_t *curr, *prev=0;
for( curr=list; curr; curr = curr->next )
{
if( element == curr )
{
if( prev == 0 )
{
io_data_t *tmp = element->next;
element->next = 0;
return tmp;
}
else
{
prev->next = element->next;
element->next = 0;
return list;
}
}
prev = curr;
}
return list;
}
io_data_t *io_duplicate( void *context, io_data_t *l )
{
io_data_t *res;
if( l == 0 )
return 0;
res = halloc( context, sizeof( io_data_t) );
if( !res )
{
DIE_MEM();
}
memcpy( res, l, sizeof(io_data_t ));
res->next=io_duplicate( context, l->next );
return res;
}
io_data_t *io_get( io_data_t *io, int fd )
{
if( io == 0 )
return 0;
io_data_t *res = io_get( io->next, fd );
if( res )
return res;
if( io->fd == fd )
return io;
return 0;
}
void io_print( io_data_t *io )
{
if( !io )
{
return;
}
debug( 1, L"IO fd %d, type ", io->fd );
switch( io->io_mode )
{
case IO_PIPE:
debug( 1, L"PIPE, data %d", io->param1.pipe_fd[io->fd?1:0] );
break;
case IO_FD:
debug( 1, L"FD, copy %d", io->param1.old_fd );
break;
case IO_BUFFER:
debug( 1, L"BUFFER" );
break;
default:
debug( 1, L"OTHER" );
}
io_print( io->next );
}
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