executor_redir.c File Reference

Redirection execution (opens files & applies redirections) More...

#include <fcntl.h>
#include <stdio.h>
#include "executor.h"
#include "libft.h"

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Detailed Description

Redirection execution (opens files & applies redirections)

Definition in file executor_redir.c.

Functions
int	open_redir_file (char *file, t_node_type type)
	Open a file for redirection (based on the redirection type) More...
int	setup_redirection (int fd, t_node_type type)
	Redirect STDIN or STDOUT to fd, saving the original. More...
void	restore_fd (int saved_fd, t_node_type type)
	Restore a previously saved file descriptor. More...
int	handle_redir (t_ast *node, t_shell *shell)
	Execute a redirection node. More...

Function Documentation

open_redir_file()

int open_redir_file	(	char *	file,
		t_node_type	type
	)

Open a file for redirection (based on the redirection type)

Opens the file with appropriate flags:

• < O_RDONLY for input
• > O_WRONLY | O_CREAT | O_TRUNC for output
• >> O_WRONLY | O_CREAT | O_APPEND for append

Parameters

file	Filename to open
type	Redirection node type

Returns

File descriptor on success or -1 on failure

Definition at line 30 of file executor_redir.c.

References NODE_REDIR_APPEND, NODE_REDIR_IN, and NODE_REDIR_OUT.

Referenced by handle_redir().

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setup_redirection()

int setup_redirection	(	int	fd,
		t_node_type	type
	)

Redirect STDIN or STDOUT to fd, saving the original.

• Saves the original fd via dup and replaces it with dup2
• Closes the source fd after duplication

Parameters

fd	File descriptor to redirect to
type	Redirection type (to determine STDIN or STDOUT target)

Returns

Saved original fd or -1 on error

Definition at line 59 of file executor_redir.c.

References NODE_REDIR_HEREDOC, and NODE_REDIR_IN.

Referenced by handle_redir().

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restore_fd()

void restore_fd	(	int	saved_fd,
		t_node_type	type
	)

Restore a previously saved file descriptor.

Parameters

saved_fd	Saved fd from setup_redirection()
type	Redirection type

Definition at line 90 of file executor_redir.c.

References NODE_REDIR_HEREDOC, and NODE_REDIR_IN.

Referenced by handle_redir().

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handle_redir()

int handle_redir	(	t_ast *	node,
		t_shell *	shell
	)

Execute a redirection node.

• Opens the redirection target (file or heredoc)
• Saves the original fd
• Executes the child command with the redirected fd
• Restores the original fd

Parameters

node	AST redirection node
shell	Shell context

Returns

Exit status of the child command or 1 on error

Note

For precollected heredocs, uses the cached heredoc_fd

Definition at line 117 of file executor_redir.c.

References t_redir_node::cmd, t_ast::data, executor(), t_redir_node::file, t_redir_node::heredoc_fd, NODE_REDIR_HEREDOC, open_redir_file(), t_ast_data::redir, restore_fd(), setup_redirection(), and t_ast::type.

Referenced by executor().

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