usr/dash/error.h

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)error.h	8.2 (Berkeley) 5/4/95
 */

#ifndef DASH_ERROR_H
#define DASH_ERROR_H

#include <setjmp.h>
#include <signal.h>

/*
 * Types of operations (passed to the errmsg routine).
 */

#define E_OPEN 01	/* opening a file */
#define E_CREAT 02	/* creating a file */
#define E_EXEC 04	/* executing a program */


/*
 * We enclose jmp_buf in a structure so that we can declare pointers to
 * jump locations.  The global variable handler contains the location to
 * jump to when an exception occurs, and the global variable exception
 * contains a code identifying the exeception.  To implement nested
 * exception handlers, the user should save the value of handler on entry
 * to an inner scope, set handler to point to a jmploc structure for the
 * inner scope, and restore handler on exit from the scope.
 */

struct jmploc {
	jmp_buf loc;
};

extern struct jmploc *handler;
extern int exception;

/* exceptions */
#define EXINT 0		/* SIGINT received */
#define EXERROR 1	/* a generic error */
#define EXSHELLPROC 2	/* execute a shell procedure */
#define EXEXEC 3	/* command execution failed */
#define EXEXIT 4	/* exit the shell */


/*
 * These macros allow the user to suspend the handling of interrupt signals
 * over a period of time.  This is similar to SIGHOLD to or sigblock, but
 * much more efficient and portable.  (But hacking the kernel is so much
 * more fun than worrying about efficiency and portability. :-))
 */

extern int suppressint;
extern volatile sig_atomic_t intpending;

#define barrier() ({ __asm__ __volatile__ ("": : :"memory"); })
#define INTOFF \
	({ \
		suppressint++; \
		barrier(); \
		0; \
	})
#ifdef REALLY_SMALL
void __inton(void);
#define INTON __inton()
#else
#define INTON \
	({ \
		barrier(); \
		if (--suppressint == 0 && intpending) onint(); \
		0; \
	})
#endif
#define FORCEINTON \
	({ \
		barrier(); \
		suppressint = 0; \
		if (intpending) onint(); \
		0; \
	})
#define SAVEINT(v) ((v) = suppressint)
#define RESTOREINT(v) \
	({ \
		barrier(); \
		if ((suppressint = (v)) == 0 && intpending) onint(); \
		0; \
	})
#define CLEAR_PENDING_INT intpending = 0
#define int_pending() intpending

void exraise(int) __attribute__((__noreturn__));
#ifdef USE_NORETURN
void onint(void) __attribute__((__noreturn__));
#else
void onint(void);
#endif
void sh_error(const char *, ...) __attribute__((__noreturn__));
void exerror(int, const char *, ...) __attribute__((__noreturn__));
const char *errmsg(int, int);

void sh_warnx(const char *, ...);

#endif		/* DASH_ERROR_H */
1	niro	532	/*-
2			* Copyright (c) 1991, 1993
3			* The Regents of the University of California. All rights reserved.
4			* Copyright (c) 1997-2005
5			* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
6			*
7			* This code is derived from software contributed to Berkeley by
8			* Kenneth Almquist.
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			* 3. Neither the name of the University nor the names of its contributors
19			* may be used to endorse or promote products derived from this software
20			* without specific prior written permission.
21			*
22			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32			* SUCH DAMAGE.
33			*
34			* @(#)error.h 8.2 (Berkeley) 5/4/95
35			*/
36
37			#ifndef DASH_ERROR_H
38			#define DASH_ERROR_H
39
40			#include <setjmp.h>
41			#include <signal.h>
42
43			/*
44			* Types of operations (passed to the errmsg routine).
45			*/
46
47			#define E_OPEN 01 /* opening a file */
48			#define E_CREAT 02 /* creating a file */
49			#define E_EXEC 04 /* executing a program */
50
51
52			/*
53			* We enclose jmp_buf in a structure so that we can declare pointers to
54			* jump locations. The global variable handler contains the location to
55			* jump to when an exception occurs, and the global variable exception
56			* contains a code identifying the exeception. To implement nested
57			* exception handlers, the user should save the value of handler on entry
58			* to an inner scope, set handler to point to a jmploc structure for the
59			* inner scope, and restore handler on exit from the scope.
60			*/
61
62			struct jmploc {
63			jmp_buf loc;
64			};
65
66			extern struct jmploc *handler;
67			extern int exception;
68
69			/* exceptions */
70			#define EXINT 0 /* SIGINT received */
71			#define EXERROR 1 /* a generic error */
72			#define EXSHELLPROC 2 /* execute a shell procedure */
73			#define EXEXEC 3 /* command execution failed */
74			#define EXEXIT 4 /* exit the shell */
75
76
77			/*
78			* These macros allow the user to suspend the handling of interrupt signals
79			* over a period of time. This is similar to SIGHOLD to or sigblock, but
80			* much more efficient and portable. (But hacking the kernel is so much
81			* more fun than worrying about efficiency and portability. :-))
82			*/
83
84			extern int suppressint;
85			extern volatile sig_atomic_t intpending;
86
87			#define barrier() ({ __asm__ __volatile__ ("": : :"memory"); })
88			#define INTOFF \
89			({ \
90			suppressint++; \
91			barrier(); \
92			0; \
93			})
94			#ifdef REALLY_SMALL
95			void __inton(void);
96			#define INTON __inton()
97			#else
98			#define INTON \
99			({ \
100			barrier(); \
101			if (--suppressint == 0 && intpending) onint(); \
102			0; \
103			})
104			#endif
105			#define FORCEINTON \
106			({ \
107			barrier(); \
108			suppressint = 0; \
109			if (intpending) onint(); \
110			0; \
111			})
112			#define SAVEINT(v) ((v) = suppressint)
113			#define RESTOREINT(v) \
114			({ \
115			barrier(); \
116			if ((suppressint = (v)) == 0 && intpending) onint(); \
117			0; \
118			})
119			#define CLEAR_PENDING_INT intpending = 0
120			#define int_pending() intpending
121
122			void exraise(int) __attribute__((__noreturn__));
123			#ifdef USE_NORETURN
124			void onint(void) __attribute__((__noreturn__));
125			#else
126			void onint(void);
127			#endif
128			void sh_error(const char *, ...) __attribute__((__noreturn__));
129			void exerror(int, const char *, ...) __attribute__((__noreturn__));
130			const char *errmsg(int, int);
131
132			void sh_warnx(const char *, ...);
133
134			#endif /* DASH_ERROR_H */