executor_pipe.c File Reference

Pipe execution: forks and handles left / right sides of pipes. More...

#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include "executor.h"
#include "libft.h"
#include "ast.h"
#include "env.h"
#include "signals.h"
#include "get_next_line.h"

Include dependency graph for executor_pipe.c:

Detailed Description

Pipe execution: forks and handles left / right sides of pipes.

Definition in file executor_pipe.c.

Functions
void	exec_left_pipe_child (t_ast *left, int pipe_fd[2], t_shell *shell)
	Execute the left side of a pipe in a child process. More...
void	exec_right_pipe_child (t_ast *right, int pipe_fd[2], t_shell *shell)
	Execute the right side of a pipe in a child process. More...
static int	wait_for_pipe_children (pid_t left_pid, pid_t right_pid)
	Wait for both pipe children and return the right one's status. More...
int	handle_pipe (t_ast *node, t_shell *shell)
	Execute a pipe node by forking left and right children. More...

Function Documentation

exec_left_pipe_child()

void exec_left_pipe_child	(	t_ast *	left,
		int	pipe_fd[2],
		t_shell *	shell
	)

Execute the left side of a pipe in a child process.

Closes the read end of the pipe and redirects STDOUT to the write end

Parameters

left	Left AST subtree to execute
pipe_fd	Pipe file descriptors: [read-—write]
shell	Shell context

Note

Never returns (calls exit)

Definition at line 33 of file executor_pipe.c.

References t_shell::current_ast, t_shell::current_input, t_shell::env, executor(), free_ast(), free_env_list(), t_shell::is_child, and reset_child_signals().

Referenced by handle_pipe().

Here is the call graph for this function:

Here is the caller graph for this function:

exec_right_pipe_child()

void exec_right_pipe_child	(	t_ast *	right,
		int	pipe_fd[2],
		t_shell *	shell
	)

Execute the right side of a pipe in a child process.

Closes the write end of the pipe and redirects STDIN to the read end

Parameters

right	Right AST subtree to execute
pipe_fd	Pipe file descriptors: [read-—write]
shell	Shell context

Note

Never returns (calls exit)

Definition at line 60 of file executor_pipe.c.

References t_shell::current_ast, t_shell::current_input, t_shell::env, executor(), free_ast(), free_env_list(), t_shell::is_child, and reset_child_signals().

Referenced by handle_pipe().

Here is the call graph for this function:

Here is the caller graph for this function:

wait_for_pipe_children()

static int wait_for_pipe_children ( pid_t  left_pid, pid_t  right_pid  )

static

Wait for both pipe children and return the right one's status.

Handles signal deaths (SIGINT = newline, SIGQUIT = core dump message)

Parameters

left_pid	PID of the left pipe child
right_pid	PID of the right pipe child

Returns

Exit status of the right child (0-255)

Definition at line 86 of file executor_pipe.c.

Referenced by handle_pipe().

Here is the caller graph for this function:

handle_pipe()

int handle_pipe	(	t_ast *	node,
		t_shell *	shell
	)

Execute a pipe node by forking left and right children.

Creates a pipe, forks 2 children:

• Left child writes to pipe and right reads from it
• Parent closes both pipe ends & waits for both children

Parameters

node	AST pipe node with binary.left and binary.right subtrees
shell	Shell context

Returns

Exit status of the rightmost command in the pipe

Definition at line 119 of file executor_pipe.c.

References t_ast_data::binary, t_ast::data, exec_left_pipe_child(), exec_right_pipe_child(), t_binary_node::left, pipe_fork_error(), t_binary_node::right, and wait_for_pipe_children().

Referenced by executor().

Here is the call graph for this function:

Here is the caller graph for this function:

Go to the source code of this file.