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1 | /* |
2 | * Copyright (c) 1985 Regents of the University of California. | |
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3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
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16 | */ |
17 | ||
2ce81398 | 18 | #if defined(LIBC_SCCS) && !defined(lint) |
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19 | static char sccsid[] = "@(#)signal.c 5.3 (Berkeley) %G%"; |
20 | #endif /* LIBC_SCCS and not lint */ | |
3a2dc6bc | 21 | |
ddc47039 RC |
22 | /* |
23 | * Almost backwards compatible signal. | |
ddc47039 | 24 | */ |
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25 | #include <signal.h> |
26 | ||
27 | int (* | |
28 | signal(s, a))() | |
29 | int s, (*a)(); | |
30 | { | |
31 | struct sigvec osv, sv; | |
32 | static int mask[NSIG]; | |
33 | static int flags[NSIG]; | |
ddc47039 | 34 | |
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35 | sv.sv_handler = a; |
36 | sv.sv_mask = mask[s]; | |
37 | sv.sv_flags = flags[s]; | |
38 | if (sigvec(s, &sv, &osv) < 0) | |
39 | return (BADSIG); | |
40 | if (sv.sv_mask != osv.sv_mask || sv.sv_flags != osv.sv_flags) { | |
41 | mask[s] = sv.sv_mask = osv.sv_mask; | |
42 | flags[s] = sv.sv_flags = osv.sv_flags; | |
43 | if (sigvec(s, &sv, 0) < 0) | |
44 | return (BADSIG); | |
45 | } | |
46 | return (osv.sv_handler); | |
47 | } |