xv6/sh.c File Reference

#include "types.h"
#include "user.h"
#include "fcntl.h"

Go to the source code of this file.

Data Structures
struct	cmd
struct	execcmd
struct	redircmd
struct	pipecmd
struct	listcmd
struct	backcmd
Defines
#define	EXEC   1
#define	REDIR   2
#define	PIPE   3
#define	LIST   4
#define	BACK   5
#define	MAXARGS   10
Functions
int	fork1 (void)
void	panic (char *)
struct cmd *	parsecmd (char *)
void	runcmd (struct cmd *cmd)
int	getcmd (char *buf, int nbuf)
int	main (void)
struct cmd *	execcmd (void)
struct cmd *	redircmd (struct cmd *subcmd, char *file, char *efile, int mode, int fd)
struct cmd *	pipecmd (struct cmd *left, struct cmd *right)
struct cmd *	listcmd (struct cmd *left, struct cmd *right)
struct cmd *	backcmd (struct cmd *subcmd)
int	gettoken (char **ps, char *es, char **q, char **eq)
int	peek (char **ps, char *es, char *toks)
struct cmd *	parseline (char **, char *)
struct cmd *	parsepipe (char **, char *)
struct cmd *	parseexec (char **, char *)
struct cmd *	nulterminate (struct cmd *)
struct cmd *	parseredirs (struct cmd *cmd, char **ps, char *es)
struct cmd *	parseblock (char **ps, char *es)
Variables
char	whitespace [] = " \t\r\n\v"
char	symbols [] = "<|>&;()"

---

Define Documentation

#define BACK   5

Definition at line 12 of file sh.c.

Referenced by backcmd(), nulterminate(), and runcmd().

#define EXEC   1

Definition at line 8 of file sh.c.

Referenced by execcmd(), nulterminate(), and runcmd().

#define LIST   4

Definition at line 11 of file sh.c.

Referenced by listcmd(), nulterminate(), and runcmd().

#define MAXARGS   10

Definition at line 14 of file sh.c.

Referenced by parseexec().

#define PIPE   3

Definition at line 10 of file sh.c.

Referenced by nulterminate(), pipecmd(), and runcmd().

#define REDIR   2

Definition at line 9 of file sh.c.

Referenced by nulterminate(), redircmd(), and runcmd().

---

Function Documentation

struct cmd* backcmd

(

struct cmd *

subcmd

)

[read]

Definition at line 249 of file sh.c.

References BACK, backcmd::cmd, malloc(), memset(), and backcmd::type.

Referenced by parseline().

struct cmd* execcmd

(

void

)

[read]

Definition at line 196 of file sh.c.

References EXEC, malloc(), memset(), and execcmd::type.

Referenced by parseexec().

int fork1

(

void

)

Definition at line 183 of file sh.c.

References fork(), and panic().

Referenced by main(), and runcmd().

int getcmd	(	char *	buf,
		int	nbuf
	)

Definition at line 134 of file sh.c.

References gets(), memset(), and printf().

Referenced by main().

int gettoken	(	char **	ps,
		char *	es,
		char **	q,
		char **	eq
	)

Definition at line 265 of file sh.c.

References strchr(), symbols, and whitespace.

Referenced by parseblock(), parseexec(), parseline(), parsepipe(), and parseredirs().

struct cmd* listcmd	(	struct cmd *	left,
		struct cmd *	right
	)			[read]

Definition at line 236 of file sh.c.

References listcmd::left, LIST, malloc(), memset(), listcmd::right, and listcmd::type.

Referenced by parseline().

int main

(

void

)

Definition at line 145 of file sh.c.

References chdir(), close(), exit(), fork1(), getcmd(), O_RDWR, open(), parsecmd(), printf(), runcmd(), strlen(), and wait().

struct cmd * nulterminate

(

struct cmd *

cmd

)

[read]

Definition at line 449 of file sh.c.

References execcmd::argv, BACK, backcmd::cmd, redircmd::cmd, execcmd::eargv, redircmd::efile, EXEC, listcmd::left, pipecmd::left, LIST, PIPE, REDIR, listcmd::right, pipecmd::right, and cmd::type.

Referenced by parsecmd().

void panic

(

char *

s

)

Definition at line 101 of file console.c.

References cli(), cons, cprintf(), getcallerpcs(), panicked, and spinlock::pcs.

Referenced by acquire(), balloc(), bfree(), bget(), bmap(), brelse(), bwrite(), create(), dirlink(), dirlookup(), exit(), fileclose(), filedup(), fileread(), filewrite(), fork1(), ialloc(), iderw(), idestart(), iget(), ilock(), iput(), isdirempty(), iunlock(), kalloc(), kfree(), mpinit(), parseblock(), parsecmd(), parseexec(), parseredirs(), popcli(), release(), runcmd(), sched(), sleep(), sys_unlink(), and trap().

struct cmd* parseblock	(	char **	ps,
		char *	es
	)			[read]

Definition at line 399 of file sh.c.

References gettoken(), panic(), parseline(), parseredirs(), and peek().

Referenced by parseexec().

struct cmd * parsecmd

(

char *

s

)

[read]

Definition at line 327 of file sh.c.

References nulterminate(), panic(), parseline(), peek(), printf(), and strlen().

Referenced by main().

struct cmd * parseexec	(	char **	ps,
		char *	es
	)			[read]

Definition at line 415 of file sh.c.

References execcmd::argv, execcmd::eargv, execcmd(), gettoken(), MAXARGS, panic(), parseblock(), parseredirs(), and peek().

Referenced by parsepipe().

struct cmd * parseline	(	char **	ps,
		char *	es
	)			[read]

Definition at line 344 of file sh.c.

References backcmd(), gettoken(), listcmd(), parsepipe(), and peek().

Referenced by parseblock(), and parsecmd().

struct cmd * parsepipe	(	char **	ps,
		char *	es
	)			[read]

Definition at line 361 of file sh.c.

References gettoken(), parseexec(), peek(), and pipecmd().

Referenced by parseline().

struct cmd* parseredirs	(	struct cmd *	cmd,
		char **	ps,
		char *	es
	)			[read]

Definition at line 374 of file sh.c.

References gettoken(), O_CREATE, O_RDONLY, O_WRONLY, panic(), peek(), and redircmd().

Referenced by parseblock(), and parseexec().

int peek	(	char **	ps,
		char *	es,
		char *	toks
	)

Definition at line 310 of file sh.c.

References strchr(), and whitespace.

Referenced by parseblock(), parsecmd(), parseexec(), parseline(), parsepipe(), and parseredirs().

struct cmd* pipecmd	(	struct cmd *	left,
		struct cmd *	right
	)			[read]

Definition at line 223 of file sh.c.

References pipecmd::left, malloc(), memset(), PIPE, pipecmd::right, and pipecmd::type.

Referenced by parsepipe().

struct cmd* redircmd	(	struct cmd *	subcmd,
		char *	file,
		char *	efile,
		int	mode,
		int	fd
	)			[read]

Definition at line 207 of file sh.c.

References redircmd::cmd, redircmd::efile, redircmd::fd, redircmd::file, malloc(), memset(), redircmd::mode, REDIR, and redircmd::type.

Referenced by parseredirs().

void runcmd

(

struct cmd *

cmd

)

Definition at line 58 of file sh.c.

References execcmd::argv, BACK, close(), backcmd::cmd, redircmd::cmd, dup(), exec(), EXEC, exit(), redircmd::fd, redircmd::file, fork1(), pipecmd::left, listcmd::left, LIST, redircmd::mode, open(), panic(), pipe(), PIPE, printf(), REDIR, pipecmd::right, listcmd::right, cmd::type, and wait().

Referenced by main().

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Variable Documentation

char symbols[] = "<|>&;()"

Definition at line 262 of file sh.c.

Referenced by gettoken().

char whitespace[] = " \t\r\n\v"

Definition at line 261 of file sh.c.

Referenced by gettoken(), and peek().