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sh.h revision 1.1.1.2 
      1 /*
      2  * Public Domain Bourne/Korn shell
      3  */
      4 
      5 /* $Id: sh.h,v 1.1.1.2 1996/10/09 15:12:52 jtc Exp $ */
      6 
      7 #include "config.h"	/* system and option configuration info */
      8 
      9 #ifdef HAVE_PROTOTYPES
     10 # define	ARGS(args)	args	/* prototype declaration */
     11 #else
     12 # define	ARGS(args)	()	/* K&R declaration */
     13 #endif
     14 
     15 
     16 /* Start of common headers */
     17 
     18 #include <stdio.h>
     19 #include <sys/types.h>
     20 #include <setjmp.h>
     21 #ifdef HAVE_STDDEF_H
     22 # include <stddef.h>
     23 #endif
     24 
     25 #ifdef HAVE_STDLIB_H
     26 # include <stdlib.h>
     27 #else
     28 /* just a useful subset of what stdlib.h would have */
     29 extern char * getenv  ARGS((const char *));
     30 extern void * malloc  ARGS((size_t));
     31 extern int    free    ARGS((void *));
     32 extern int    exit    ARGS((int));
     33 extern int    rand    ARGS((void));
     34 extern void   srand   ARGS((unsigned int));
     35 extern int    atoi    ARGS((const char *));
     36 #endif /* HAVE_STDLIB_H */
     37 
     38 #ifdef HAVE_UNISTD_H
     39 # include <unistd.h>
     40 #else
     41 /* just a useful subset of what unistd.h would have */
     42 extern int access ARGS((const char *, int));
     43 extern int open ARGS((const char *, int, ...));
     44 extern int creat ARGS((const char *, mode_t));
     45 extern int read ARGS((int, char *, unsigned));
     46 extern int write ARGS((int, const char *, unsigned));
     47 extern off_t lseek ARGS((int, off_t, int));
     48 extern int close ARGS((int));
     49 extern int pipe ARGS((int []));
     50 extern int dup2 ARGS((int, int));
     51 extern int unlink ARGS((const char *));
     52 extern int fork ARGS((void));
     53 extern int execve ARGS((const char *, char * const[], char * const[]));
     54 extern int chdir ARGS((const char *));
     55 extern int kill ARGS((pid_t, int));
     56 extern char *getcwd();	/* no ARGS here - differs on different machines */
     57 extern int geteuid ARGS((void));
     58 extern int readlink ARGS((const char *, char *, int));
     59 extern int getegid ARGS((void));
     60 extern int getpid ARGS((void));
     61 extern int getppid ARGS((void));
     62 extern unsigned int sleep ARGS((unsigned int));
     63 extern int isatty ARGS((int));
     64 # ifdef POSIX_PGRP
     65 extern int getpgrp ARGS((void));
     66 extern int setpgid ARGS((pid_t, pid_t));
     67 # endif /* POSIX_PGRP */
     68 # ifdef BSD_PGRP
     69 extern int getpgrp ARGS((pid_t));
     70 extern int setpgrp ARGS((pid_t, pid_t));
     71 # endif /* BSD_PGRP */
     72 # ifdef SYSV_PGRP
     73 extern int getpgrp ARGS((void));
     74 extern int setpgrp ARGS((void));
     75 # endif /* SYSV_PGRP */
     76 #endif /* HAVE_UNISTD_H */
     77 
     78 #ifdef HAVE_STRING_H
     79 # include <string.h>
     80 #else
     81 # include <strings.h>
     82 # define strchr index
     83 # define strrchr rindex
     84 #endif /* HAVE_STRING_H */
     85 #ifndef HAVE_STRSTR
     86 char *strstr ARGS((const char *s, const char *p));
     87 #endif /* HAVE_STRSTR */
     88 #ifndef HAVE_STRCASECMP
     89 int strcasecmp ARGS((const char *s1, const char *s2));
     90 int strncasecmp ARGS((const char *s1, const char *s2, int n));
     91 #endif /* HAVE_STRCASECMP */
     92 
     93 #ifdef HAVE_MEMORY_H
     94 # include <memory.h>
     95 #endif
     96 #ifndef HAVE_MEMSET
     97 # define memcpy(d, s, n)	bcopy(s, d, n)
     98 # define memcmp(s1, s2, n)	bcmp(s1, s2, n)
     99 void *memset ARGS((void *d, int c, size_t n));
    100 #endif /* HAVE_MEMSET */
    101 #ifndef HAVE_MEMMOVE
    102 # ifdef HAVE_BCOPY
    103 #  define memmove(d, s, n)	bcopy(s, d, n)
    104 # else
    105 void *memmove ARGS((void *d, const void *s, size_t n));
    106 # endif
    107 #endif /* HAVE_MEMMOVE */
    108 
    109 #ifdef HAVE_PROTOTYPES
    110 # include <stdarg.h>
    111 # define SH_VA_START(va, argn) va_start(va, argn)
    112 #else
    113 # include <varargs.h>
    114 # define SH_VA_START(va, argn) va_start(va)
    115 #endif /* HAVE_PROTOTYPES */
    116 
    117 #include <errno.h>
    118 extern int errno;
    119 
    120 #ifdef HAVE_FCNTL_H
    121 # include <fcntl.h>
    122 #else
    123 # include <sys/file.h>
    124 #endif /* HAVE_FCNTL_H */
    125 #ifndef O_ACCMODE
    126 # define O_ACCMODE	(O_RDONLY|O_WRONLY|O_RDWR)
    127 #endif /* !O_ACCMODE */
    128 
    129 #ifndef F_OK 	/* access() arguments */
    130 # define F_OK 0
    131 # define X_OK 1
    132 # define W_OK 2
    133 # define R_OK 4
    134 #endif /* !F_OK */
    135 
    136 #ifndef SEEK_SET
    137 # ifdef L_SET
    138 #  define SEEK_SET L_SET
    139 #  define SEEK_CUR L_INCR
    140 #  define SEEK_END L_XTND
    141 # else /* L_SET */
    142 #  define SEEK_SET 0
    143 #  define SEEK_CUR 1
    144 #  define SEEK_END 2
    145 # endif /* L_SET */
    146 #endif /* !SEEK_SET */
    147 
    148 /* Some machines (eg, FreeBSD 1.1.5) define CLK_TCK in limits.h
    149  * (ksh_limval.h assumes limits has been included, if available)
    150  */
    151 #ifdef HAVE_LIMITS_H
    152 # include <limits.h>
    153 #endif /* HAVE_LIMITS_H */
    154 
    155 #include <signal.h>
    156 #ifdef	NSIG
    157 # define SIGNALS	NSIG
    158 #else
    159 # ifdef	_MINIX
    160 #  define SIGNALS	(_NSIG+1) /* _NSIG is # of signals used, excluding 0. */
    161 # else
    162 #  ifdef _SIGMAX	/* QNX */
    163 #   define SIGNALS	_SIGMAX
    164 #  else /* _SIGMAX */
    165 #   define SIGNALS	32
    166 #  endif /* _SIGMAX */
    167 # endif	/* _MINIX */
    168 #endif	/* NSIG */
    169 #ifndef SIGCHLD
    170 # define SIGCHLD SIGCLD
    171 #endif
    172 /* struct sigaction.sa_flags is set to KSH_SA_FLAGS.  Used to ensure
    173  * system calls are interrupted
    174  */
    175 #ifdef SA_INTERRUPT
    176 # define KSH_SA_FLAGS	SA_INTERRUPT
    177 #else /* SA_INTERRUPT */
    178 # define KSH_SA_FLAGS	0
    179 #endif /* SA_INTERRUPT */
    180 
    181 typedef	RETSIGTYPE (*handler_t) ARGS((int));	/* signal handler */
    182 
    183 #ifdef USE_FAKE_SIGACT
    184 # include "sigact.h"			/* use sjg's fake sigaction() */
    185 #endif
    186 
    187 #ifdef HAVE_PATHS_H
    188 # include <paths.h>
    189 #endif /* HAVE_PATHS_H */
    190 #ifdef _PATH_DEFPATH
    191 # define DEFAULT__PATH _PATH_DEFPATH
    192 #else /* _PATH_DEFPATH */
    193 # define DEFAULT__PATH DEFAULT_PATH
    194 #endif /* _PATH_DEFPATH */
    195 
    196 #ifndef offsetof
    197 # define offsetof(type,id) ((size_t)&((type*)NULL)->id)
    198 #endif
    199 
    200 #ifndef HAVE_KILLPG
    201 # define killpg(p, s)	kill(-(p), (s))
    202 #endif /* !HAVE_KILLPG */
    203 
    204 /* Special cases for execve(2) */
    205 #ifdef OS2
    206 extern int ksh_execve(char *cmd, char **args, char **env);
    207 #else /* OS2 */
    208 # if defined(OS_ISC) && defined(_POSIX_SOURCE)
    209 /* Kludge for ISC 3.2 (and other versions?) so programs will run correctly.  */
    210 #  define ksh_execve(p, av, ev) do { \
    211 					__setostype(0); \
    212 					execve(p, av, ev); \
    213 					__setostype(1); \
    214 				} while (0)
    215 # else /* OS_ISC && _POSIX */
    216 #  define ksh_execve(p, av, ev)	execve(p, av, ev)
    217 # endif /* OS_ISC && _POSIX */
    218 #endif /* OS2 */
    219 
    220 /* this is a hang-over from older versions of the os2 port */
    221 #define ksh_dupbase(fd, base) fcntl(fd, F_DUPFD, base)
    222 
    223 #ifdef HAVE_SIGSETJMP
    224 # define ksh_sigsetjmp(env,sm)	sigsetjmp((env), (sm))
    225 # define ksh_siglongjmp(env,v)	siglongjmp((env), (v))
    226 # define ksh_jmp_buf		sigjmp_buf
    227 #else /* HAVE_SIGSETJMP */
    228 # ifdef HAVE__SETJMP
    229 #  define ksh_sigsetjmp(env,sm)	_setjmp(env)
    230 #  define ksh_siglongjmp(env,v)	_longjmp((env), (v))
    231 # else /* HAVE__SETJMP */
    232 #  define ksh_sigsetjmp(env,sm)	setjmp(env)
    233 #  define ksh_siglongjmp(env,v)	longjmp((env), (v))
    234 # endif /* HAVE__SETJMP */
    235 # define ksh_jmp_buf		jmp_buf
    236 #endif /* HAVE_SIGSETJMP */
    237 
    238 /* Find a integer type that is at least 32 bits (or die) - SIZEOF_* defined
    239  * by autoconf (assumes an 8 bit byte, but I'm not concerned)
    240  */
    241 #if SIZEOF_INT >= 4
    242 # define INT32	int
    243 #else /* SIZEOF_INT */
    244 # if SIZEOF_LONG >= 4
    245 #  define INT32	long
    246 # else /* SIZEOF_LONG */
    247    #error cannot find 32 bit type...
    248 # endif /* SIZEOF_LONG */
    249 #endif /* SIZEOF_INT */
    250 
    251 /* end of common headers */
    252 
    253 /* Stop gcc and lint from complaining about possibly uninitialized variables */
    254 #if defined(__GNUC__) || defined(lint)
    255 # define UNINITIALIZED(var)	var = 0
    256 #else
    257 # define UNINITIALIZED(var)	var
    258 #endif /* GNUC || lint */
    259 
    260 /* some useful #defines */
    261 #ifdef EXTERN
    262 # define I__(i) = i
    263 #else
    264 # define I__(i)
    265 # define EXTERN extern
    266 # define EXTERN_DEFINED
    267 #endif
    268 
    269 #ifndef EXECSHELL
    270 /* shell to exec scripts (see also $SHELL initialization in main.c) */
    271 # ifdef OS2
    272 #  define EXECSHELL	"c:\\os2\\cmd.exe"
    273 #  define EXECSHELL_STR	"OS2_SHELL"
    274 # else /* OS2 */
    275 #  define EXECSHELL	"/bin/sh"
    276 #  define EXECSHELL_STR	"EXECSHELL"
    277 # endif /* OS2 */
    278 #endif
    279 
    280 /* ISABSPATH() means path is fully and completely specified,
    281  * ISROOTEDPATH() means a .. as the first component is a no-op,
    282  * ISRELPATH() means $PWD can be tacked on to get an absolute path.
    283  *
    284  * OS	Path		ISABSPATH	ISROOTEDPATH	ISRELPATH
    285  * unix	/foo		yes		yes		no
    286  * unix	foo		no		no		yes
    287  * unix	../foo		no		no		yes
    288  * os2	a:/foo		yes		yes		no
    289  * os2	a:foo		no		no		no
    290  * os2	/foo		no		yes		no
    291  * os2	foo		no		no		yes
    292  * os2	../foo		no		no		yes
    293  */
    294 #ifdef OS2
    295 # define PATHSEP        ';'
    296 # define DIRSEP         '/'	/* even though \ is native */
    297 # define DIRSEPSTR      "\\"
    298 # define ISDIRSEP(c)    ((c) == '\\' || (c) == '/')
    299 # define ISABSPATH(s)	(((s)[0] && (s)[1] == ':' && ISDIRSEP((s)[2])))
    300 # define ISROOTEDPATH(s) (ISDIRSEP((s)[0]) || ISABSPATH(s))
    301 # define ISRELPATH(s)	(!(s)[0] || ((s)[1] != ':' && !ISDIRSEP((s)[0])))
    302 # define FILECHCONV(c)	(isascii(c) && isupper(c) ? tolower(c) : c)
    303 # define FILECMP(s1, s2) stricmp(s1, s2)
    304 # define FILENCMP(s1, s2, n) strnicmp(s1, s2, n)
    305 extern char *ksh_strchr_dirsep(const char *path);
    306 extern char *ksh_strrchr_dirsep(const char *path);
    307 # define chdir          _chdir2
    308 # define getcwd         _getcwd2
    309 #else
    310 # define PATHSEP        ':'
    311 # define DIRSEP         '/'
    312 # define DIRSEPSTR      "/"
    313 # define ISDIRSEP(c)    ((c) == '/')
    314 # define ISABSPATH(s)	ISDIRSEP((s)[0])
    315 # define ISROOTEDPATH(s) ISABSPATH(s)
    316 # define ISRELPATH(s)	(!ISABSPATH(s))
    317 # define FILECHCONV(c)	c
    318 # define FILECMP(s1, s2) strcmp(s1, s2)
    319 # define FILENCMP(s1, s2, n) strncmp(s1, s2, n)
    320 # define ksh_strchr_dirsep(p)   strchr(p, DIRSEP)
    321 # define ksh_strrchr_dirsep(p)  strrchr(p, DIRSEP)
    322 #endif
    323 
    324 typedef int bool_t;
    325 #define	FALSE	0
    326 #define	TRUE	1
    327 
    328 #define	NELEM(a) (sizeof(a) / sizeof((a)[0]))
    329 #define	sizeofN(type, n) (sizeof(type) * (n))
    330 #define	BIT(i)	(1<<(i))	/* define bit in flag */
    331 
    332 /* Table flag type - needs > 16 and < 32 bits */
    333 typedef INT32 Tflag;
    334 
    335 #define	NUFILE	10		/* Number of user-accessible files */
    336 #define	FDBASE	10		/* First file usable by Shell */
    337 
    338 /* you're not going to run setuid shell scripts, are you? */
    339 #define	eaccess(path, mode)	access(path, mode)
    340 
    341 /* Make MAGIC a char that might be printed to make bugs more obvious, but
    342  * not a char that is used often.  Also, can't use the high bit as it causes
    343  * portability problems (calling strchr(x, 0x80|'x') is error prone).
    344  */
    345 #define	MAGIC		(7)/* prefix for *?[!{,} during expand */
    346 #define ISMAGIC(c)	((unsigned char)(c) == MAGIC)
    347 #define	NOT		'!'	/* might use ^ (ie, [!...] vs [^..]) */
    348 
    349 #define	LINE	1024		/* input line size */
    350 #define	PATH	1024		/* pathname size (todo: PATH_MAX/pathconf()) */
    351 #define ARRAYMAX 1023		/* max array index */
    352 
    353 EXTERN	const char *kshname;	/* $0 */
    354 EXTERN	pid_t	kshpid;		/* $$, shell pid */
    355 EXTERN	pid_t	procpid;	/* pid of executing process */
    356 EXTERN	int	exstat;		/* exit status */
    357 EXTERN	int	subst_exstat;	/* exit status of last $(..)/`..` */
    358 EXTERN	const char *safe_prompt; /* safe prompt if PS1 substitution fails */
    359 
    360 
    361 /*
    362  * Area-based allocation built on malloc/free
    363  */
    364 
    365 typedef struct Area {
    366 	struct Block *freelist;	/* free list */
    367 } Area;
    368 
    369 EXTERN	Area	aperm;		/* permanent object space */
    370 #define	APERM	&aperm
    371 #define	ATEMP	&e->area
    372 
    373 #ifdef MEM_DEBUG
    374 # include "chmem.h" /* a debugging front end for malloc et. al. */
    375 #endif /* MEM_DEBUG */
    376 
    377 
    378 /*
    379  * parsing & execution environment
    380  */
    381 EXTERN	struct env {
    382 	short	type;			/* enviroment type - see below */
    383 	short	flags;			/* EF_* */
    384 	Area	area;			/* temporary allocation area */
    385 	struct	block *loc;		/* local variables and functions */
    386 	short  *savefd;			/* original redirected fd's */
    387 	struct	env *oenv;		/* link to previous enviroment */
    388 	ksh_jmp_buf jbuf;		/* long jump back to env creator */
    389 	struct temp *temps;		/* temp files */
    390 } *e;
    391 
    392 /* struct env.type values */
    393 #define	E_NONE	0		/* dummy enviroment */
    394 #define	E_PARSE	1		/* parsing command # */
    395 #define	E_FUNC	2		/* executing function # */
    396 #define	E_INCL	3		/* including a file via . # */
    397 #define	E_EXEC	4		/* executing command tree */
    398 #define	E_LOOP	5		/* executing for/while # */
    399 #define	E_ERRH	6		/* general error handler # */
    400 /* # indicates env has valid jbuf (see unwind()) */
    401 
    402 /* struct env.flag values */
    403 #define EF_FUNC_PARSE	BIT(0)	/* function being parsed */
    404 #define EF_BRKCONT_PASS	BIT(1)	/* set if E_LOOP must pass break/continue on */
    405 
    406 /* Do breaks/continues stop at env type e? */
    407 #define STOP_BRKCONT(t)	((t) == E_NONE || (t) == E_PARSE \
    408 			 || (t) == E_FUNC || (t) == E_INCL)
    409 /* Do returns stop at env type e? */
    410 #define STOP_RETURN(t)	((t) == E_FUNC || (t) == E_INCL)
    411 
    412 /* values for ksh_siglongjmp(e->jbuf, 0) */
    413 #define LRETURN	1		/* return statement */
    414 #define	LEXIT	2		/* exit statement */
    415 #define LERROR	3		/* errorf() called */
    416 #define LLEAVE	4		/* untrappable exit/error */
    417 #define LINTR	5		/* ^C noticed */
    418 #define	LBREAK	6		/* break statement */
    419 #define	LCONTIN	7		/* continue statement */
    420 #define LSHELL	8		/* return to interactive shell() */
    421 #define LAEXPR	9		/* error in arithmetic expression */
    422 
    423 
    424 /* option processing */
    425 #define OF_CMDLINE	0x01	/* command line */
    426 #define OF_SET		0x02	/* set builtin */
    427 #define OF_SPECIAL	0x04	/* a special variable changing */
    428 #define OF_ANY		(OF_CMDLINE | OF_SET | OF_SPECIAL)
    429 
    430 struct option {
    431     const char	*name;	/* long name of option */
    432     char	c;	/* character flag (if any) */
    433     short	flags;	/* OF_* */
    434 };
    435 extern const struct option options[];
    436 
    437 /*
    438  * flags (the order of these enums MUST match the order in misc.c(options[]))
    439  */
    440 enum sh_flag {
    441 	FEXPORT = 0,	/* -a: export all */
    442 #ifdef BRACE_EXPAND
    443 	FBRACEEXPAND,	/* enable {} globbing */
    444 #endif
    445 	FBGNICE,	/* bgnice */
    446 	FCOMMAND,	/* -c: (invocation) execute specified command */
    447 #ifdef EMACS
    448 	FEMACS,		/* emacs command editing */
    449 #endif
    450 	FERREXIT,	/* -e: quit on error */
    451 #ifdef EMACS
    452 	FGMACS,		/* gmacs command editing */
    453 #endif
    454 	FIGNOREEOF,	/* eof does not exit */
    455 	FTALKING,	/* -i: interactive */
    456 	FKEYWORD,	/* -k: name=value anywere */
    457 	FLOGIN,		/* -l: a login shell */
    458 	FMARKDIRS,	/* mark dirs with / in file name completion */
    459 	FMONITOR,	/* -m: job control monitoring */
    460 	FNOCLOBBER,	/* -C: don't overwrite existing files */
    461 	FNOEXEC,	/* -n: don't execute any commands */
    462 	FNOGLOB,	/* -f: don't do file globbing */
    463 	FNOHUP,		/* -H: don't kill running jobs when login shell exits */
    464 	FNOLOG,		/* don't save functions in history (ignored) */
    465 #ifdef	JOBS
    466 	FNOTIFY,	/* -b: asynchronous job completion notification */
    467 #endif
    468 	FNOUNSET,	/* -u: using an unset var is an error */
    469 	FPHYSICAL,	/* -o physical: don't do logical cd's/pwd's */
    470 	FPOSIX,		/* -o posix: be posixly correct */
    471 	FPRIVILEGED,	/* -p: use suid_profile */
    472 	FRESTRICTED,	/* -r: restricted shell */
    473 	FSTDIN,		/* -s: (invocation) parse stdin */
    474 	FTRACKALL,	/* -h: create tracked aliases for all commands */
    475 	FVERBOSE,	/* -v: echo input */
    476 #ifdef VI
    477 	FVI,		/* vi command editing */
    478 	FVIRAW,		/* always read in raw mode (ignored) */
    479 	FVISHOW8,	/* display chars with 8th bit set as is (versus M-) */
    480 	FVITABCOMPLETE,	/* enable tab as file name completion char */
    481 	FVIESCCOMPLETE,	/* enable ESC as file name completion in command mode */
    482 #endif
    483 	FXTRACE,	/* -x: execution trace */
    484 	FNFLAGS /* (place holder: how many flags are there) */
    485 };
    486 
    487 #define Flag(f)	(shell_flags[(int) (f)])
    488 
    489 EXTERN	char shell_flags [FNFLAGS];
    490 
    491 EXTERN	char	null [] I__("");	/* null value for variable */
    492 EXTERN	char	space [] I__(" ");
    493 EXTERN	char	newline [] I__("\n");
    494 EXTERN	char	slash [] I__("/");
    495 
    496 /* temp/here files. the file is removed when the struct is freed */
    497 struct temp {
    498 	struct temp	*next;
    499 	struct shf	*shf;
    500 	int		pid;		/* pid of process parsed here-doc */
    501 	char		*name;
    502 };
    503 
    504 /* here documents in functions are treated specially (the get removed when
    505  * shell exis) */
    506 EXTERN struct temp	*func_heredocs;
    507 
    508 /*
    509  * stdio and our IO routines
    510  */
    511 
    512 #define shl_spare	(&shf_iob[0])	/* for c_read()/c_print() */
    513 #define shl_stdout	(&shf_iob[1])
    514 #define shl_out		(&shf_iob[2])
    515 EXTERN int shl_stdout_ok;
    516 
    517 /*
    518  * trap handlers
    519  */
    520 typedef struct trap {
    521 	int	signal;		/* signal number */
    522 	const char *name;	/* short name */
    523 	const char *mess;	/* descriptive name */
    524 	char   *trap;		/* trap command */
    525 	int	volatile set;	/* trap pending */
    526 	int	flags;		/* TF_* */
    527 	handler_t cursig;	/* current handler (valid if TF_ORIG_* set) */
    528 	handler_t shtrap;	/* shell signal handler */
    529 } Trap;
    530 
    531 /* values for Trap.flags */
    532 #define TF_SHELL_USES	BIT(0)	/* shell uses signal, user can't change */
    533 #define TF_USER_SET	BIT(1)	/* user has (tried to) set trap */
    534 #define TF_ORIG_IGN	BIT(2)	/* original action was SIG_IGN */
    535 #define TF_ORIG_DFL	BIT(3)	/* original action was SIG_DFL */
    536 #define TF_EXEC_IGN	BIT(4)	/* restore SIG_IGN just before exec */
    537 #define TF_EXEC_DFL	BIT(5)	/* restore SIG_DFL just before exec */
    538 #define TF_DFL_INTR	BIT(6)	/* when received, default action is LINTR */
    539 #define TF_TTY_INTR	BIT(7)	/* tty generated signal (see j_waitj) */
    540 #define TF_CHANGED	BIT(8)	/* used by runtrap() to detect trap changes */
    541 #define TF_FATAL	BIT(9)	/* causes termination if not trapped */
    542 
    543 /* values for setsig()/setexecsig() flags argument */
    544 #define SS_RESTORE_MASK	0x3	/* how to restore a signal before an exec() */
    545 #define SS_RESTORE_CURR	0	/* leave current handler in place */
    546 #define SS_RESTORE_ORIG	1	/* restore original handler */
    547 #define SS_RESTORE_DFL	2	/* restore to SIG_DFL */
    548 #define SS_RESTORE_IGN	3	/* restore to SIG_IGN */
    549 #define SS_FORCE	BIT(3)	/* set signal even if original signal ignored */
    550 #define SS_USER		BIT(4)	/* user is doing the set (ie, trap command) */
    551 #define SS_SHTRAP	BIT(5)	/* trap for internal use (CHLD,ALRM,WINCH) */
    552 
    553 #define SIGEXIT_	0	/* for trap EXIT */
    554 #define SIGERR_		SIGNALS	/* for trap ERR */
    555 
    556 EXTERN	int volatile trap;	/* traps pending? */
    557 EXTERN	int volatile intrsig;	/* pending trap interrupts executing command */
    558 EXTERN	int volatile fatal_trap;/* received a fatal signal */
    559 #ifndef FROM_TRAP_C
    560 /* Kludge to avoid bogus re-declaration of sigtraps[] error on AIX 3.2.5 */
    561 extern	Trap	sigtraps[SIGNALS+1];
    562 #endif /* !FROM_TRAP_C */
    563 
    564 
    565 #ifdef KSH
    566 /*
    567  * TMOUT support
    568  */
    569 /* values for ksh_tmout_state */
    570 enum tmout_enum {
    571 		TMOUT_EXECUTING	= 0,	/* executing commands */
    572 		TMOUT_READING,		/* waiting for input */
    573 		TMOUT_LEAVING		/* have timed out */
    574 	};
    575 EXTERN unsigned int ksh_tmout;
    576 EXTERN enum tmout_enum ksh_tmout_state I__(TMOUT_EXECUTING);
    577 #endif /* KSH */
    578 
    579 
    580 /* For "You have stopped jobs" message */
    581 EXTERN int really_exit;
    582 
    583 
    584 /*
    585  * fast character classes
    586  */
    587 #define	C_ALPHA	 BIT(0)		/* a-z_A-Z */
    588 #define	C_DIGIT	 BIT(1)		/* 0-9 */
    589 #define	C_LEX1	 BIT(2)		/* \0 \t\n|&;<>() */
    590 #define	C_VAR1	 BIT(3)		/* *@#!$-? */
    591 #define	C_IFSWS	 BIT(4)		/* \t \n (IFS white space) */
    592 #define	C_SUBOP1 BIT(5)		/* "=-+?" */
    593 #define	C_SUBOP2 BIT(6)		/* "#%" */
    594 #define	C_IFS	 BIT(7)		/* $IFS */
    595 #define	C_QUOTE	 BIT(8)		/*  \n\t"#$&'()*;<>?[\`| (needing quoting) */
    596 
    597 extern	short ctypes [];
    598 
    599 #define	ctype(c, t)	!!(ctypes[(unsigned char)(c)]&(t))
    600 #define	letter(c)	ctype(c, C_ALPHA)
    601 #define	digit(c)	ctype(c, C_DIGIT)
    602 #define	letnum(c)	ctype(c, C_ALPHA|C_DIGIT)
    603 
    604 EXTERN int ifs0 I__(' ');	/* for "$*" */
    605 
    606 
    607 /* Argument parsing for built-in commands and getopts command */
    608 
    609 /* Values for Getopt.flags */
    610 #define GF_ERROR	BIT(0)	/* call errorf() if there is an error */
    611 #define GF_PLUSOPT	BIT(1)	/* allow +c as an option */
    612 #define GF_NONAME	BIT(2)	/* don't print argv[0] in errors */
    613 
    614 /* Values for Getopt.info */
    615 #define GI_MINUS	BIT(0)	/* an option started with -... */
    616 #define GI_PLUS		BIT(1)	/* an option started with +... */
    617 #define GI_MINUSMINUS	BIT(2)	/* arguments were ended with -- */
    618 
    619 typedef struct {
    620 	int		optind;
    621 	char		*optarg;
    622 	int		flags;	/* see GF_* */
    623 	int		info;	/* see GI_* */
    624 	unsigned int	p;	/* 0 or index into argv[optind - 1] */
    625 	char		buf[2];	/* for bad option OPTARG value */
    626 } Getopt;
    627 
    628 EXTERN Getopt builtin_opt;	/* for shell builtin commands */
    629 
    630 
    631 #ifdef KSH
    632 /* This for co-processes */
    633 
    634 typedef INT32 Coproc_id; /* something that won't (realisticly) wrap */
    635 struct coproc {
    636 	int	read;		/* pipe from co-process's stdout */
    637 	int	readw;		/* other side of read (saved temporarily) */
    638 	int	write;		/* pipe to co-process's stdin */
    639 	Coproc_id id;		/* id of current output pipe */
    640 	int	njobs;		/* number of live jobs using output pipe */
    641 	void    *job;           /* 0 or job of co-process using input pipe */
    642 };
    643 EXTERN struct coproc coproc;
    644 #endif /* KSH */
    645 
    646 /* Used in jobs.c and by coprocess stuff in exec.c */
    647 #ifdef JOB_SIGS
    648 EXTERN sigset_t		sm_default, sm_sigchld;
    649 #endif /* JOB_SIGS */
    650 
    651 extern const char ksh_version[];
    652 
    653 /* name of called builtin function (used by error functions) */
    654 EXTERN char	*builtin_argv0;
    655 EXTERN Tflag	builtin_flag;	/* flags of called builtin (SPEC_BI, etc.) */
    656 
    657 /* current working directory, and size of memory allocated for same */
    658 EXTERN char	*current_wd;
    659 EXTERN int	current_wd_size;
    660 
    661 #ifdef EDIT
    662 /* Minimium required space to work with on a line - if the prompt leaves less
    663  * space than this on a line, the prompt is truncated.
    664  */
    665 # define MIN_EDIT_SPACE	7
    666 /* Minimium allowed value for x_cols: 2 for prompt, 3 for " < " at end of line
    667  */
    668 # define MIN_COLS	(2 + MIN_EDIT_SPACE + 3)
    669 EXTERN	int	x_cols I__(80);	/* tty columns */
    670 #else
    671 # define x_cols 80		/* for pr_menu(exec.c) */
    672 #endif
    673 
    674 
    675 /* These to avoid bracket matching problems */
    676 #define OPAREN	'('
    677 #define CPAREN	')'
    678 #define OBRACK	'['
    679 #define CBRACK	']'
    680 #define OBRACE	'{'
    681 #define CBRACE	'}'
    682 
    683 /* Determine the location of the system (common) profile */
    684 #ifndef KSH_SYSTEM_PROFILE
    685 # ifdef __NeXT
    686 #  define KSH_SYSTEM_PROFILE "/etc/profile.std"
    687 # else /* __NeXT */
    688 #  define KSH_SYSTEM_PROFILE "/etc/profile"
    689 # endif /* __NeXT */
    690 #endif /* KSH_SYSTEM_PROFILE */
    691 
    692 #include "shf.h"
    693 #include "table.h"
    694 #include "tree.h"
    695 #include "expand.h"
    696 #include "lex.h"
    697 #include "proto.h"
    698 
    699 /* be sure not to interfere with anyone else's idea about EXTERN */
    700 #ifdef EXTERN_DEFINED
    701 # undef EXTERN_DEFINED
    702 # undef EXTERN
    703 #endif
    704 #undef I__
    705