1 static char Sccsid[] = "@(#)setsig.c 1.2 02/15/87"; 2 3 # include "signal.h" 4 #undef NSIG 5 # ifdef PWB 6 #define NSIG 16 7 # else 8 #define NSIG 4 9 # endif 10 # include "../hdr/macros.h" 11 12 /* 13 General-purpose signal setting routine. 14 All non-ignored, non-caught signals are caught. 15 If a signal other than hangup, interrupt, or quit is caught, 16 a "user-oriented" message is printed on file descriptor 2 with 17 a number for help(I). 18 If hangup, interrupt or quit is caught, that signal 19 is set to ignore. 20 Termination is like that of "fatal", 21 via "clean_up(sig)" (sig is the signal number) 22 and "exit(userexit(1))". 23 24 If the file "dump.core" exists in the current directory 25 the function commits 26 suicide to produce a core dump 27 (after calling clean_up, but before calling userexit). 28 */ 29 30 31 char *Mesg[NSIG] = { 32 0, 33 0, /* Hangup */ 34 0, /* Interrupt */ 35 0, /* Quit */ 36 # ifdef PWB 37 "Illegal instruction", 38 "Trace/BPT trap", 39 "IOT trap", 40 "EMT trap", 41 "Floating exception", 42 "Killed", 43 "Bus error", 44 "Memory fault", 45 "Bad system call", 46 "Broken pipe", 47 "Alarm clock", 48 "Terminated" 49 # endif PWB 50 }; 51 52 53 setsig() 54 { 55 extern int setsig1(); 56 register int j, n; 57 58 for (j=1; j<NSIG; j++) 59 if (n=signal(j,setsig1)) 60 signal(j,n); 61 } 62 63 64 static char preface[] = "SIGNAL: "; 65 static char endmsg[] = " (ut12)\n"; 66 67 setsig1(sig) 68 int sig; 69 { 70 # ifndef PWB 71 sig = 2; 72 # endif PWB 73 if (Mesg[sig]) { 74 syswrite(2,preface,length(preface)); 75 syswrite(2,Mesg[sig],length(Mesg[sig])); 76 syswrite(2,endmsg,length(endmsg)); 77 } 78 else 79 signal(sig,1); 80 clean_up(sig); 81 if(open("dump.core",0) > 0) { 82 signal(SIGIOT,0); 83 abort(); 84 } 85 exit(userexit(1)); 86 } 87