| 1 | /*
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| 2 | (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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| 3 | See the copyright notice in the ACK home directory, in the file "Copyright".
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | Module: Mapping of Unix signals to EM traps
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| 8 | (only when not using the MON instruction)
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| 9 | Author: Ceriel J.H. Jacobs
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| 10 | Version: $Header: /cvsup/minix/src/lib/ack/libm2/sigtrp.c,v 1.1 2005/10/10 15:27:46 beng Exp $
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| 11 | */
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| 12 |
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| 13 | #if !defined(__em22) && !defined(__em24) && !defined(__em44)
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| 14 |
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| 15 | #define EM_trap(n) TRP(n) /* define to whatever is needed to cause the trap */
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| 16 |
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| 17 | #include <signal.h>
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| 18 | #include <errno.h>
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| 19 |
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| 20 | int __signo;
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| 21 |
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| 22 | static int __traps[] = {
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| 23 | -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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| 24 | -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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| 25 | -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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| 26 | };
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| 27 |
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| 28 | static void
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| 29 | __ctchsig(signo)
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| 30 | {
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| 31 | signal(signo,__ctchsig);
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| 32 | #ifdef __BSD4_2
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| 33 | sigsetmask(sigblock(0) & ~(1<<(signo - 1)));
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| 34 | #endif
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| 35 | __signo = signo;
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| 36 | EM_trap(__traps[signo]);
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| 37 | }
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| 38 |
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| 39 | int
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| 40 | sigtrp(trapno, signo)
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| 41 | {
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| 42 | /* Let Unix signal signo cause EM trap trapno to occur.
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| 43 | If trapno = -2, restore default,
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| 44 | If trapno = -3, ignore.
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| 45 | Return old trapnumber.
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| 46 | Careful, this could be -2 or -3; But return value of -1
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| 47 | indicates failure, with error number in errno.
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| 48 | */
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| 49 | extern int errno;
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| 50 | void (*ctch)() = __ctchsig;
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| 51 | void (*oldctch)();
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| 52 | int oldtrap;
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| 53 |
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| 54 | if (signo <= 0 || signo >= sizeof(__traps)/sizeof(__traps[0])) {
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| 55 | errno = EINVAL;
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| 56 | return -1;
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| 57 | }
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| 58 |
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| 59 | if (trapno == -3)
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| 60 | ctch = SIG_IGN;
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| 61 | else if (trapno == -2)
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| 62 | ctch = SIG_DFL;
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| 63 | else if (trapno >= 0 && trapno <= 252)
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| 64 | ;
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| 65 | else {
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| 66 | errno = EINVAL;
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| 67 | return -1;
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| 68 | }
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| 69 |
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| 70 | oldtrap = __traps[signo];
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| 71 |
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| 72 | if ((oldctch = signal(signo, ctch)) == (void (*)())-1) /* errno set by signal */
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| 73 | return -1;
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| 74 |
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| 75 | else if (oldctch == SIG_IGN) {
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| 76 | signal(signo, SIG_IGN);
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| 77 | }
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| 78 | else __traps[signo] = trapno;
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| 79 |
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| 80 | return oldtrap;
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| 81 | }
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| 82 | #endif
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