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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | /* * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) * Licensed under the GPL */ #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <signal.h> #include <errno.h> #include <stdarg.h> #include <string.h> #include <sys/mman.h> #include "user_util.h" #include "kern_util.h" #include "user.h" #include "signal_user.h" #include "signal_kern.h" #include "sysdep/sigcontext.h" #include "sigcontext.h" extern int kern_timer_on; void set_sigstack(void *sig_stack, int size) { stack_t stack; stack.ss_sp = (__ptr_t) sig_stack; stack.ss_flags = 0; stack.ss_size = size - sizeof(void *); if(sigaltstack(&stack, NULL) != 0) panic("sigaltstack failed"); } void set_handler(int sig, void (*handler)(int), int flags, ...) { struct sigaction action; va_list ap; int mask; va_start(ap, flags); action.sa_handler = handler; sigemptyset(&action.sa_mask); while((mask = va_arg(ap, int)) != -1){ sigaddset(&action.sa_mask, mask); } action.sa_flags = flags; action.sa_restorer = NULL; if(sigaction(sig, &action, NULL) < 0) panic("sigaction failed"); } int change_sig(int signal, int on) { sigset_t sigset, old; sigemptyset(&sigset); sigaddset(&sigset, signal); sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old); return(sigismember(&old, signal)); } static void change_signals(int type) { sigset_t mask; sigemptyset(&mask); if(type == SIG_BLOCK) kern_timer_on = 0; else { kern_timer_on = 1; sigaddset(&mask, SIGVTALRM); sigaddset(&mask, SIGALRM); } sigaddset(&mask, SIGIO); sigaddset(&mask, SIGPROF); if(sigprocmask(type, &mask, NULL) < 0) panic("Failed to change signal mask - errno = %d", errno); } void block_signals(void) { change_signals(SIG_BLOCK); } void unblock_signals(void) { change_signals(SIG_UNBLOCK); } #define SIGIO_BIT 0 #define SIGVTALRM_BIT 1 static int disable_mask(sigset_t *mask) { int sigs; sigs = sigismember(mask, SIGIO) ? 1 << SIGIO_BIT : 0; sigs |= sigismember(mask, SIGVTALRM) ? 1 << SIGVTALRM_BIT : 0; sigs |= sigismember(mask, SIGALRM) ? 1 << SIGVTALRM_BIT : 0; if(!kern_timer_on) sigs |= 1 << SIGVTALRM_BIT; return(sigs); } int get_signals(void) { sigset_t mask; if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0) panic("Failed to get signal mask"); return(disable_mask(&mask)); } int set_signals(int disable) { sigset_t mask; int ret; sigemptyset(&mask); if(!(disable & (1 << SIGIO_BIT))) sigaddset(&mask, SIGIO); if(!(disable & (1 << SIGVTALRM_BIT))){ kern_timer_on = 1; sigaddset(&mask, SIGVTALRM); sigaddset(&mask, SIGALRM); } if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0) panic("Failed to enable signals"); ret = disable_mask(&mask); sigemptyset(&mask); if(disable & (1 << SIGIO_BIT)) sigaddset(&mask, SIGIO); if(disable & (1 << SIGVTALRM_BIT)) kern_timer_on = 0; if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0) panic("Failed to block signals"); return(ret); } /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-file-style: "linux" * End: */ |