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#ifndef FISH_IO_H
#define FISH_IO_H
/**
Describes what type of IO operation an io_data_t represents
*/
enum io_mode
{
IO_FILE, IO_PIPE, IO_FD, IO_BUFFER, IO_CLOSE
}
;
/** Represents an FD redirection */
typedef struct io_data
{
/** Type of redirect */
int io_mode;
/** FD to redirect */
int fd;
/**
Type-specific parameter for redirection
*/
union
{
/** Fds for IO_PIPE and for IO_BUFFER */
int pipe_fd[2];
/** Filename IO_FILE */
wchar_t *filename;
/** fd to redirect specified fd to, for IO_FD*/
int old_fd;
} param1
;
/**
Second type-specific paramter for redirection
*/
union
{
/** file creation flags to send to open for IO_FILE */
int flags;
/** buffer to save output in for IO_BUFFER */
buffer_t *out_buffer;
/** Whether to close old_fd for IO_FD */
int close_old;
} param2
;
/**
Set to true if this is an input io redirection
*/
int is_input;
/** Pointer to the next IO redirection */
struct io_data *next;
}
io_data_t;
/**
Join two chains of io redirections
*/
io_data_t *io_add( io_data_t *first_chain, io_data_t *decond_chain );
/**
Remove the specified io redirection from the chain
*/
io_data_t *io_remove( io_data_t *list, io_data_t *element );
/**
Make a copy of the specified chain of redirections. Uses halloc.
*/
io_data_t *io_duplicate( void *context, io_data_t *l );
/**
Return the last io redirection in the chain for the specified file descriptor.
*/
io_data_t *io_get( io_data_t *io, int fd );
/**
Free all resources used by a IO_BUFFER type io redirection.
*/
void io_buffer_destroy( io_data_t *io_buffer );
/**
Create a IO_BUFFER type io redirection, complete with a pipe and a
buffer_t for output. The default file descriptor used is 1 for
output buffering and 0 for input buffering.
\param is_input set this parameter to zero if the buffer should be
used to buffer the output of a command, or non-zero to buffer the
input to a command.
*/
io_data_t *io_buffer_create( int is_input );
/**
Close output pipe, and read from input pipe until eof.
*/
void io_buffer_read( io_data_t *d );
/**
Print debug information about the specified IO redirection chain to stderr.
*/
void io_print( io_data_t *io );
#endif