1 static char Sccsid[] = "@(#)setsig.c 1.3 12/22/88"; 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 #include <sys/syscall.h> 12 #define syswrite(a,b,c) syscall(SYS_write,a,b,c) 13 14 /* 15 General-purpose signal setting routine. 16 All non-ignored, non-caught signals are caught. 17 If a signal other than hangup, interrupt, or quit is caught, 18 a "user-oriented" message is printed on file descriptor 2 with 19 a number for help(I). 20 If hangup, interrupt or quit is caught, that signal 21 is set to ignore. 22 Termination is like that of "fatal", 23 via "clean_up(sig)" (sig is the signal number) 24 and "exit(userexit(1))". 25 26 If the file "dump.core" exists in the current directory 27 the function commits 28 suicide to produce a core dump 29 (after calling clean_up, but before calling userexit). 30 */ 31 32 33 char *Mesg[NSIG] = { 34 0, 35 0, /* Hangup */ 36 0, /* Interrupt */ 37 0, /* Quit */ 38 # ifdef PWB 39 "Illegal instruction", 40 "Trace/BPT trap", 41 "IOT trap", 42 "EMT trap", 43 "Floating exception", 44 "Killed", 45 "Bus error", 46 "Memory fault", 47 "Bad system call", 48 "Broken pipe", 49 "Alarm clock", 50 "Terminated" 51 # endif PWB 52 }; 53 54 55 setsig() 56 { 57 extern int setsig1(); 58 register int j, n; 59 60 for (j=1; j<NSIG; j++) 61 if (n=signal(j,setsig1)) 62 signal(j,n); 63 } 64 65 66 static char preface[] = "SIGNAL: "; 67 static char endmsg[] = " (ut12)\n"; 68 69 setsig1(sig) 70 int sig; 71 { 72 # ifndef PWB 73 sig = 2; 74 # endif PWB 75 if (Mesg[sig]) { 76 syswrite(2,preface,length(preface)); 77 syswrite(2,Mesg[sig],length(Mesg[sig])); 78 syswrite(2,endmsg,length(endmsg)); 79 } 80 else 81 signal(sig,1); 82 clean_up(sig); 83 if(open("dump.core",0) > 0) { 84 signal(SIGIOT,0); 85 abort(); 86 } 87 exit(userexit(1)); 88 } 89