OS2021_Project1.Shell
 

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3.7 KiB

#pragma once
#define CMDLINE_MAX_SIZE 1024 /* max length of a single command line */
#define ARGS_MAX_QUANTITY 128 /* max args on a command line */
#define BUFFER_MAX_SIZE 64 /* max size of a buffer which contains parsed arguments */
#define CMDLINE_DIV ' \t\r\n\a'
#define CMDLINE_HISTORY_MAX_QUANTITY 256
#define JOBS_MAX_QUANTITY 16
#define PATH_MAX_SIZE 256
#define LS_BUF_SIZE 1024
#define UNDF 0 /* undefined */
#define FG 1 /* running in foreground */
#define BG 2 /* running in background */
#define ST 3 /* stopped */
#define NO_REDRT 0 /* no redirection */
#define OUT_REDRT 1 /* the latter is output */
#define IN_REDRT 2 /* the former is input */
/* job_t - The job struct */
struct job_t
{
pid_t pid; /* job PID */
int jid; /* job ID [1, 2, ...] */
int state; /* UNDEF, BG, FG, or ST */
char cmdline[CMDLINE_MAX_SIZE]; /* command line */
};
/* readline - Get the command line */
char *readline();
/* parseline - Evaluate the command line that the user has just typed in */
int parseline(char *cmdline, char **args);
/* redirect - Judge if the command contains redirection */
int redirect(char **args, char *redirect_file, char **redirect_args);
/* execute - Execute the command line */
int execute(char *cmdline, char **args);
/* builtin functions - Handle built-in command */
int built_in(char **args);
int builtin_cd(char **args);
int builtin_history(char **args);
int builtin_jobs(char **args);
int builtin_mytop(char **args);
/* do_bgfg - Execute background/foregroung tasks */
int do_bgfg(char **args);
/* waitfg - Wait foreground jobs to finish */
void waitfg(pid_t pid);
/* initjobs - Initialize the job list */
void initjobs(struct job_t *jobs);
/* addjob - Add jobs to joblist */
int addjob(struct job_t *jobs, pid_t pid, int state, char *cmdline);
/* listjobs - Print the job list */
void listjobs(struct job_t *jobs);
/* deletejob - Delete a job whose PID=pid from the job list */
int deletejob(struct job_t *jobs, pid_t pid);
/* clearjob - Clear the entries in a job struct */
void clearjob(struct job_t *job);
/* pide2jid - Map process ID to job ID*/
int pid2jid(pid_t pid);
/* fgpid - Return PID of current foreground job, 0 if no such job */
pid_t fgpid(struct job_t *jobs);
/* getjobpid - Find a job (by PID) on the job list */
struct job_t *getjobpid(struct job_t *jobs, pid_t pid);
/* getjobjid - Find a job (by JID) on the job list */
struct job_t *getjobjid(struct job_t *jobs, int jid);
/* maxjid - Returns largest allocated job ID */
int maxjid(struct job_t *jobs);
/* Signal - wrapper for the sigaction function */
typedef void handler_t(int);
handler_t *Signal(int signum, handler_t *handler);
/*
* sigchld_handler - The kernel sends a SIGCHLD to the shell whenever
* a child job terminates (becomes a zombie), or stops because it
* received a SIGSTOP or SIGTSTP signal. The handler reaps all
* available zombie children, but doesn't wait for any other
* currently running children to terminate.
*/
void sigchld_handler(int signal);
/*
* sigint_handler - The kernel sends a SIGINT to the shell whenver the
* user types ctrl-c at the keyboard. Catch it and send it along
* to the foreground job.
*/
void sigint_handler(int signal);
/*
* sigtstp_handler - The kernel sends a SIGTSTP to the shell whenever
* the user types ctrl-z at the keyboard. Catch it and suspend the
* foreground job by sending it a SIGTSTP.
*/
void sigtstp_handler(int signal);
/*
* sigquit_handler - The driver program can gracefully terminate the
* child shell by sending it a SIGQUIT signal.
*/
void sigquit_handler(int signal);