1 # 2 3 #include <signal.h> 4 5 /* 6 * The following is for systems with botched signal() system entries 7 * which don't return the proper value for the previous signal. 8 */ 9 10 int oldsigs[17]; 11 12 static char *SccsId = "@(#)Signal.c 2.1 07/01/81"; 13 14 int 15 (*Signal())(sig, spot) 16 int spot; 17 { 18 int ret; 19 20 /* printf("Signal(%d, %.1o)\n", sig, spot); */ 21 if (sig < 1 || sig > 16) 22 return(-1); 23 ret = oldsigs[sig]; 24 oldsigs[sig] = (int) spot; 25 signal(sig, spot); 26 return(ret); 27 } 28 29 Siginit() 30 { 31 register int i; 32 33 for (i = 1; i < 17; i++) { 34 oldsigs[i] = (int) signal(i, SIG_IGN); 35 signal(i, (int (*)()) oldsigs[i]); 36 } 37 } 38