dist/ntp/libntp/syssignal.c

   1 /*      $NetBSD$        */
   2
   3 #ifdef HAVE_CONFIG_H
   4 # include <config.h>
   5 #endif
   6
   7 #include <stdio.h>
   8 #include <sys/types.h>
   9 #include <signal.h>
  10
  11 #include "ntp_syslog.h"
  12 #include "ntp_stdlib.h"
  13
  14 #ifdef HAVE_SIGACTION
  15
  16 void
  17 signal_no_reset(
  18 #if defined(__STDC__) || defined(HAVE_STDARG_H)
  19         int sig,
  20         void (*func) (int)
  21 #else
  22         sig, func
  23 #endif
  24         )
  25 #if defined(__STDC__) || defined(HAVE_STDARG_H)
  26 #else
  27          int sig;
  28          void (*func) P((int));
  29 #endif
  30 {
  31         int n;
  32         struct sigaction vec;
  33
  34         vec.sa_handler = func;
  35         sigemptyset(&vec.sa_mask);
  36 #if 0
  37 #ifdef SA_RESTART
  38         vec.sa_flags = SA_RESTART;
  39 #else
  40         vec.sa_flags = 0;
  41 #endif
  42 #else
  43         vec.sa_flags = 0;
  44 #endif
  45
  46 #ifdef SA_RESTART
  47 /* Added for PPS clocks on Solaris 7 which get EINTR errors */
  48 # ifdef SIGPOLL
  49         if (sig == SIGPOLL) vec.sa_flags = SA_RESTART;
  50 # endif
  51 # ifdef SIGIO
  52         if (sig == SIGIO)   vec.sa_flags = SA_RESTART;
  53 # endif
  54 #endif
  55
  56         while (1)
  57         {
  58                 struct sigaction ovec;
  59
  60                 n = sigaction(sig, &vec, &ovec);
  61                 if (n == -1 && errno == EINTR) continue;
  62                 if (ovec.sa_flags
  63 #ifdef  SA_RESTART
  64                     && ovec.sa_flags != SA_RESTART
  65 #endif
  66                     )
  67                         msyslog(LOG_DEBUG, "signal_no_reset: signal %d had flags %x",
  68                                 sig, ovec.sa_flags);
  69                 break;
  70         }
  71         if (n == -1) {
  72                 perror("sigaction");
  73                 exit(1);
  74         }
  75 }
  76
  77 #elif  HAVE_SIGVEC
  78
  79 void
  80 signal_no_reset(
  81         int sig,
  82         RETSIGTYPE (*func) (int)
  83         )
  84 {
  85         struct sigvec sv;
  86         int n;
  87
  88         bzero((char *) &sv, sizeof(sv));
  89         sv.sv_handler = func;
  90         n = sigvec(sig, &sv, (struct sigvec *)NULL);
  91         if (n == -1) {
  92                 perror("sigvec");
  93                 exit(1);
  94         }
  95 }
  96
  97 #elif  HAVE_SIGSET
  98
  99 void
 100 signal_no_reset(
 101         int sig,
 102         RETSIGTYPE (*func) (int)
 103         )
 104 {
 105         int n;
 106
 107         n = sigset(sig, func);
 108         if (n == -1) {
 109                 perror("sigset");
 110                 exit(1);
 111         }
 112 }
 113
 114 #else
 115
 116 /* Beware!      This implementation resets the signal to SIG_DFL */
 117 void
 118 signal_no_reset(
 119         int sig,
 120         RETSIGTYPE (*func) (int)
 121         )
 122 {
 123 #ifdef SIG_ERR
 124         if (SIG_ERR == signal(sig, func)) {
 125 #else
 126         int n;
 127         n = signal(sig, func);
 128         if (n == -1) {
 129 #endif
 130                 perror("signal");
 131                 exit(1);
 132         }
 133 }
 134
 135 #endif