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  10 .TH BSD_SIGNAL 3C "Jul 24, 2002"
  11 .SH NAME
  12 bsd_signal \- simplified signal facilities
  13 .SH SYNOPSIS
  14 .LP
  15 .nf
  16 #include <signal.h>
  17 
  18 \fBvoid\fR (\fB*bsd_signal(int\fR \fIsig\fR, \fBvoid\fR (*\fIfunc\fR)(\fBint\fR)))(\fBint\fR);
  19 .fi
  20 
  21 .SH DESCRIPTION
  22 .sp
  23 .LP
  24 The \fBbsd_signal()\fR function provides a partially compatible interface for
  25 programs written to historical system interfaces (see \fBUSAGE\fR below).
  26 .sp
  27 .LP
  28 The function call \fBbsd_signal\fR(\fIsig\fR, \fIfunc\fR) has an effect as if
  29 implemented as:
  30 .sp
  31 .in +2
  32 .nf
  33 void (*bsd_signal(int sig, void (*func)\|(int)))\|(int)
  34 {
  35      struct sigaction act, oact;
  36 
  37      act.sa_handler = \fIfunc\fR;
  38      act.sa_flags = SA_RESTART;
  39      sigemptyset(&act.sa_mask);
  40      sigaddset(&act.sa_mask, \fIsig\fR);
  41      if (sigaction(\fIsig\fR, &act, &oact) == \(mi1)
  42           return(\fBSIG_ERR\fR);
  43      return(oact.sa_handler);
  44 }
  45 .fi
  46 .in -2
  47 
  48 .sp
  49 .LP
  50 The handler function should be declared:
  51 .sp
  52 .in +2
  53 .nf
  54 void handler(int \fIsig\fR);
  55 .fi
  56 .in -2
  57 
  58 .sp
  59 .LP
  60 where \fIsig\fR is the signal number.  The behavior is undefined if \fIfunc\fR
  61 is a function that takes more than one argument, or an argument of a different
  62 type.
  63 .SH RETURN VALUES
  64 .sp
  65 .LP
  66 Upon successful completion, \fBbsd_signal()\fR returns the previous action for
  67 \fIsig\fR. Otherwise, \fBSIG_ERR\fR is returned and \fBerrno\fR is set to
  68 indicate the error.
  69 .SH ERRORS
  70 .sp
  71 .LP
  72 Refer to \fBsigaction\fR(2).
  73 .SH USAGE
  74 .sp
  75 .LP
  76 This function is a direct replacement for the \fBBSD\fR \fBsignal\fR(3UCB)
  77 function for simple applications that are installing a single-argument signal
  78 handler function.  If a \fBBSD\fR signal handler function is being installed
  79 that expects more than one argument, the application has to be modified to use
  80 \fBsigaction\fR(2). The \fBbsd_signal()\fR function differs from
  81 \fBsignal\fR(3UCB) in that the \fBSA_RESTART\fR flag is set and the
  82 \fBSA_RESETHAND\fR will be clear when \fBbsd_signal()\fR is used.  The state of
  83 these flags is not specified for \fBsignal\fR(3UCB).
  84 .SH ATTRIBUTES
  85 .sp
  86 .LP
  87 See \fBattributes\fR(5) for descriptions of the following attributes:
  88 .sp
  89 
  90 .sp
  91 .TS
  92 box;
  93 c | c
  94 l | l .
  95 ATTRIBUTE TYPE  ATTRIBUTE VALUE
  96 _
  97 Interface Stability     Standard
  98 .TE
  99 
 100 .SH SEE ALSO
 101 .sp
 102 .LP
 103 \fBsigaction\fR(2), \fBsigaddset\fR(3C), \fBsigemptyset\fR(3C),
 104 \fBsignal\fR(3UCB), \fBattributes\fR(5), \fBstandards\fR(5)