gen/FreeBSD/psignal.3

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  28 .\"     @(#)psignal.3   8.2 (Berkeley) 2/27/95
  29 .\" $FreeBSD: src/lib/libc/gen/psignal.3,v 1.17 2007/01/09 00:27:54 imp Exp $
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  31 .Dd February 27, 1995
  32 .Dt PSIGNAL 3
  33 .Os
  34 .Sh NAME
  35 .Nm psignal ,
  36 .Nm strsignal ,
  37 .Nm sys_siglist ,
  38 .Nm sys_signame
  39 .Nd system signal messages
  40 .Sh LIBRARY
  41 .Lb libc
  42 .Sh SYNOPSIS
  43 .In signal.h
  44 .Ft void
  45 .Fn psignal "unsigned sig" "const char *s"
  46 .Vt extern const char * const sys_siglist[] ;
  47 .Vt extern const char * const sys_signame[] ;
  48 .In string.h
  49 .Ft "char *"
  50 .Fn strsignal "int sig"
  51 .Sh DESCRIPTION
  52 The
  53 .Fn psignal
  54 and
  55 .Fn strsignal
  56 functions locate the descriptive message
  57 string for a signal number.
  58 .Pp
  59 The
  60 .Fn strsignal
  61 function accepts a signal number argument
  62 .Fa sig
  63 and returns a pointer to the corresponding message string.
  64 .Pp
  65 The
  66 .Fn psignal
  67 function accepts a signal number argument
  68 .Fa sig
  69 and writes it to the standard error.
  70 If the argument
  71 .Fa s
  72 is
  73 .Pf non- Dv NULL
  74 and does not point to the null character,
  75 .Fa s
  76 is written to the standard error file descriptor
  77 prior to the message string,
  78 immediately followed by a colon and a space.
  79 If the signal number is not recognized
  80 .Pq Xr sigaction 2 ,
  81 the string
  82 .Dq "Unknown signal
  83 is produced.
  84 .Pp
  85 The message strings can be accessed directly
  86 through the external array
  87 .Va sys_siglist ,
  88 indexed by recognized signal numbers.
  89 The external array
  90 .Va sys_signame
  91 is used similarly and
  92 contains short, lower-case abbreviations for signals
  93 which are useful for recognizing signal names
  94 in user input.
  95 The defined variable
  96 .Dv NSIG
  97 contains a count of the strings in
  98 .Va sys_siglist
  99 and
 100 .Va sys_signame .
 101 .Sh SEE ALSO
 102 .Xr sigaction 2 ,
 103 .Xr perror 3 ,
 104 .Xr strerror 3
 105 .Sh HISTORY
 106 The
 107 .Fn psignal
 108 function appeared in
 109 .Bx 4.2 .