projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 A |
1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* | |
| 23 | * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved | |
| 24 | * | |
| 25 | * @(#)sigaction.c 1.0 | |
| 26 | */ | |
| 27 | ||
| 28 | #include <sys/syscall.h> | |
| 29 | #include <signal.h> | |
| 30 | #include <sys/signal.h> | |
| 31 | #include <errno.h> | |
| 32 | ||
| 33 | /* | |
| 34 | * Intercept the sigaction syscall and use our signal trampoline | |
| 35 | * as the signal handler instead. The code here is derived | |
| 36 | * from sigvec in sys/kern_sig.c. | |
| 37 | */ | |
| 38 | ||
| 39 | extern void (*sigcatch[NSIG])(); | |
| 40 | #if defined(__DYNAMIC__) | |
| 41 | extern int __in_sigtramp; | |
| 42 | #endif | |
| 43 | ||
| 44 | static int | |
| 45 | sigaction__ (sig, nsv, osv, bind) | |
| 46 | int sig; | |
| 47 | register struct sigaction *nsv, *osv; | |
| 48 | int bind; | |
| 49 | { | |
| 50 | struct sigaction vec; | |
| 51 | void (*prevsig)(); | |
| 52 | extern void _sigtramp(); | |
| 53 | ||
| 54 | if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) { | |
| 55 | errno = EINVAL; | |
| 56 | return (-1); | |
| 57 | } | |
| 58 | prevsig = sigcatch[sig]; | |
| 59 | if (nsv) { | |
| 60 | sigcatch[sig] = nsv->sa_handler; | |
| 61 | vec = *nsv; nsv = &vec; | |
| 62 | if (nsv->sa_handler != (void (*)())SIG_DFL && nsv->sa_handler != (void (*)())SIG_IGN) { | |
| 63 | nsv->sa_handler = _sigtramp; | |
| 64 | #ifdef __DYNAMIC__ | |
| 65 | if (bind && (__in_sigtramp == 0)) // XXX | |
| 66 | _dyld_bind_fully_image_containing_address(sigcatch[sig]); | |
| 67 | #endif | |
| 68 | } | |
| 69 | } | |
| 70 | if (syscall (SYS_sigaction, sig, nsv, osv) < 0) { | |
| 71 | sigcatch[sig] = prevsig; | |
| 72 | return (-1); | |
| 73 | } | |
| 74 | if (osv && prevsig) | |
| 75 | osv->sa_handler = prevsig; | |
| 76 | return (0); | |
| 77 | } | |
| 78 | ||
| 79 | ||
| 80 | int | |
| 81 | sigaction (sig, nsv, osv) | |
| 82 | int sig; | |
| 83 | register const struct sigaction *nsv; | |
| 84 | register struct sigaction *osv; | |
| 85 | { | |
| 86 | return sigaction__(sig, nsv, osv, 1); | |
| 87 | } | |
| 88 | ||
| 89 | // XXX | |
| 90 | #ifdef __DYNAMIC__ | |
| 91 | ||
| 92 | int | |
| 93 | _sigaction_nobind (sig, nsv, osv) | |
| 94 | int sig; | |
| 95 | register const struct sigaction *nsv; | |
| 96 | register struct sigaction *osv; | |
| 97 | { | |
| 98 | return sigaction__(sig, nsv, osv, 0); | |
| 99 | } | |
| 100 | #endif | |
| 101 |