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