execute.c File Reference

Command execution from UI (forks, captures output, updates mood) More...

#include <sys/wait.h>
#include <fcntl.h>
#include "minishell_ui.h"
#include "env.h"
#include "get_next_line.h"

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Detailed Description

Command execution from UI (forks, captures output, updates mood)

Definition in file execute.c.

Functions
static int	init_pipe_and_fds (int *pipe_fd, int *saved_fds, t_ui *ui)
	Create a pipe and save current STDOUT / STDERR file descriptors. More...
static void	handle_fork_error (t_ui *ui, int *pipe_fd, int *saved_fds)
	Clean up after a failed fork & report the error to the UI. More...
static void	exec_child (int *pipe_fd, int *saved_fds, t_shell *shell)
	Redirect I/O to the pipe and run the command. More...
static void	exec_parent (int *pipe_fd, int *saved_fds, t_shell *sh, pid_t pid)
	Collect output, restore I/O and wait for child. More...
void	execute_minishell_cmd (t_shell *shell)
	Fork a child to execute a minishell command & capture its output. More...

Function Documentation

init_pipe_and_fds()

static int init_pipe_and_fds ( int *  pipe_fd, int *  saved_fds, t_ui *  ui  )

static

Create a pipe and save current STDOUT / STDERR file descriptors.

On pipe failure it sets exit_code = 1 and waifu's mood to upset

Parameters

pipe_fd	2 element array to receive the pipe read and write ends
saved_fds	2 elements array to receive the duped STDOUT and STDERR
ui	UI state

Returns

0 on success and -1 on pipe failure

Definition at line 29 of file execute.c.

References t_out::exit_code, MOOD_UPSET, t_ui::out, out_add_line(), and update_waifu_mood().

Referenced by execute_minishell_cmd().

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handle_fork_error()

static void handle_fork_error ( t_ui *  ui, int *  pipe_fd, int *  saved_fds  )

static

Clean up after a failed fork & report the error to the UI.

Parameters

ui	UI state
pipe_fd	The pipe ends to close
saved_fds	The saved STDOUT / STDERR to close

Definition at line 50 of file execute.c.

References t_out::exit_code, MOOD_UPSET, t_ui::out, out_add_line(), and update_waifu_mood().

Referenced by execute_minishell_cmd().

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exec_child()

static void exec_child ( int *  pipe_fd, int *  saved_fds, t_shell *  shell  )

static

Redirect I/O to the pipe and run the command.

• Redirects STDIN from /dev/null and STDOUT & STDERR to the pipe write end
• Calls process_ui_input(), frees memory and exits with the command status

Parameters

pipe_fd	Pipe read and write ends
saved_fds	Saved STDOUT / STDERR originals to close
shell	Shell state

Definition at line 71 of file execute.c.

References t_shell::env, free_env_list(), out_free(), process_ui_input(), and t_shell::ui.

Referenced by execute_minishell_cmd().

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exec_parent()

static void exec_parent ( int *  pipe_fd, int *  saved_fds, t_shell *  sh, pid_t  pid  )

static

Collect output, restore I/O and wait for child.

• Reads all child output before restoring STDOUT and STDERR
• Updates exit_code and waifu mood accordingly

Parameters

pipe_fd	The pipe read and write ends
saved_fds	Saved STDOUT / STDERR to restore
sh	Shell state (owns the UI)
pid	PID of the child to wait for

Definition at line 107 of file execute.c.

References MOOD_PROUD, MOOD_UPSET, read_output_from_fd(), t_shell::ui, and update_waifu_mood().

Referenced by execute_minishell_cmd().

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execute_minishell_cmd()

void execute_minishell_cmd

(

t_shell *

shell

)

Fork a child to execute a minishell command & capture its output.

Creates a pipe, forks, runs exec_child() in the child and exec_parent() in the parent

Parameters

shell

Shell state (contains command buffer and UI output)

Definition at line 137 of file execute.c.

References exec_child(), exec_parent(), handle_fork_error(), init_pipe_and_fds(), MOOD_HAPPY, t_shell::ui, and update_waifu_mood().

Referenced by cmd_execute().

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