sys/pthread_sigmask.2

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  28 .\" $FreeBSD: src/lib/libc_r/man/pthread_sigmask.3,v 1.9 2001/10/01 16:09:09 ru Exp $
  29 .Dd April 27, 2000
  30 .Dt PTHREAD_SIGMASK 2
  31 .Os
  32 .Sh NAME
  33 .Nm pthread_sigmask
  34 .Nd examine and/or change a thread's signal mask
  35 .Sh SYNOPSIS
  36 .In pthread.h
  37 .In signal.h
  38 .Ft int
  39 .Fn pthread_sigmask "int how" "const sigset_t *set" "sigset_t *oset"
  40 .Sh DESCRIPTION
  41 The
  42 .Fn pthread_sigmask
  43 function examines and/or changes the calling thread's signal mask.
  44 .Pp
  45 If
  46 .Fa set
  47 is not
  48 .Dv NULL ,
  49 it specifies a set of signals to be modified, and
  50 .Fa how
  51 specifies what to set the signal mask to:
  52 .Bl -tag -width SIG_UNBLOCK
  53 .It Dv SIG_BLOCK
  54 Union of the current mask and
  55 .Fa set .
  56 .It Dv SIG_UNBLOCK
  57 Intersection of the current mask and the complement of
  58 .Fa set .
  59 .It Dv SIG_SETMASK
  60 .Fa set .
  61 .El
  62 .Pp
  63 If
  64 .Fa oset
  65 is not NULL, the previous signal mask is stored in the location pointed to by
  66 .Fa oset .
  67 .Pp
  68 .Dv SIGKILL
  69 and
  70 .Dv SIGSTOP
  71 cannot be blocked, and will be silently ignored if included in the signal mask.
  72 .Sh RETURN VALUES
  73 If successful,
  74 .Fn pthread_sigmask
  75 returns 0.
  76 Otherwise, an error is returned.
  77 .Sh ERRORS
  78 .Fn pthread_sigmask
  79 will fail if:
  80 .Bl -tag -width Er
  81 .It Bq Er EINVAL
  82 .Fa how
  83 is not one of the defined values.
  84 .El
  85 .Sh SEE ALSO
  86 .Xr sigaction 2 ,
  87 .Xr sigpending 2 ,
  88 .Xr sigprocmask 2 ,
  89 .Xr sigsuspend 2 ,
  90 .Xr sigsetops 3
  91 .Sh STANDARDS
  92 .Fn pthread_sigmask
  93 conforms to ISO/IEC 9945-1:1996 (``POSIX.1'')