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130 lines
2.7 KiB
130 lines
2.7 KiB
2 years ago
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/*
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* linux/kernel/signal.c
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*
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* (C) 1991 Linus Torvalds
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <asm/segment.h>
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#include <errno.h>
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#include <signal.h>
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volatile void do_exit(int error_code);
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int sys_sgetmask()
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{
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return current->blocked;
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}
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int sys_ssetmask(int newmask)
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{
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int old=current->blocked;
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current->blocked = newmask & ~(1<<(SIGKILL-1));
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return old;
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}
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int sys_sigpending()
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{
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return -ENOSYS;
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}
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int sys_sigsuspend()
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{
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return -ENOSYS;
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}
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static inline void save_old(char * from,char * to)
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{
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int i;
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verify_area(to, sizeof(struct sigaction));
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for (i=0 ; i< sizeof(struct sigaction) ; i++) {
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put_fs_byte(*from,to);
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from++;
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to++;
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}
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}
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static inline void get_new(char * from,char * to)
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{
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int i;
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for (i=0 ; i< sizeof(struct sigaction) ; i++)
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*(to++) = get_fs_byte(from++);
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}
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int sys_signal(int signum, long handler, long restorer)
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{
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struct sigaction tmp;
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if (signum<1 || signum>32 || signum==SIGKILL)
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return -1;
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tmp.sa_handler = (void (*)(int)) handler;
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tmp.sa_mask = 0;
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tmp.sa_flags = SA_ONESHOT | SA_NOMASK;
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tmp.sa_restorer = (void (*)(void)) restorer;
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handler = (long) current->sigaction[signum-1].sa_handler;
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current->sigaction[signum-1] = tmp;
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return handler;
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}
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int sys_sigaction(int signum, const struct sigaction * action,
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struct sigaction * oldaction)
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{
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struct sigaction tmp;
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if (signum<1 || signum>32 || signum==SIGKILL)
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return -1;
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tmp = current->sigaction[signum-1];
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get_new((char *) action,
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(char *) (signum-1+current->sigaction));
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if (oldaction)
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save_old((char *) &tmp,(char *) oldaction);
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if (current->sigaction[signum-1].sa_flags & SA_NOMASK)
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current->sigaction[signum-1].sa_mask = 0;
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else
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current->sigaction[signum-1].sa_mask |= (1<<(signum-1));
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return 0;
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}
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void do_signal(long signr,long eax, long ebx, long ecx, long edx,
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long fs, long es, long ds,
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long eip, long cs, long eflags,
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unsigned long * esp, long ss)
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{
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unsigned long sa_handler;
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long old_eip=eip;
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struct sigaction * sa = current->sigaction + signr - 1;
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int longs;
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unsigned long * tmp_esp;
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sa_handler = (unsigned long) sa->sa_handler;
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if (sa_handler==1)
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return;
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if (!sa_handler) {
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if (signr==SIGCHLD)
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return;
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else
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do_exit(1<<(signr-1));
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}
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if (sa->sa_flags & SA_ONESHOT)
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sa->sa_handler = NULL;
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*(&eip) = sa_handler;
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longs = (sa->sa_flags & SA_NOMASK)?7:8;
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*(&esp) -= longs;
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verify_area(esp,longs*4);
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tmp_esp=esp;
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put_fs_long((long) sa->sa_restorer,tmp_esp++);
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put_fs_long(signr,tmp_esp++);
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if (!(sa->sa_flags & SA_NOMASK))
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put_fs_long(current->blocked,tmp_esp++);
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put_fs_long(eax,tmp_esp++);
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put_fs_long(ecx,tmp_esp++);
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put_fs_long(edx,tmp_esp++);
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put_fs_long(eflags,tmp_esp++);
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put_fs_long(old_eip,tmp_esp++);
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current->blocked |= sa->sa_mask;
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}
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