man/pthread_sigmask.2

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  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 signal.h
  37 .Ft int
  38 .Fo pthread_sigmask
  39 .Fa "int how"
  40 .Fa "const sigset_t *restrict set"
  41 .Fa "sigset_t *restrict oset"
  42 .Fc
  43 .Sh DESCRIPTION
  44 The
  45 .Fn pthread_sigmask
  46 function examines and/or changes the calling thread's signal mask.
  47 .Pp
  48 If
  49 .Fa set
  50 is not
  51 .Dv NULL ,
  52 it specifies a set of signals to be modified, and
  53 .Fa how
  54 specifies what to set the signal mask to:
  55 .Bl -tag -width SIG_UNBLOCK
  56 .It Dv SIG_BLOCK
  57 Union of the current mask and
  58 .Fa set .
  59 .It Dv SIG_UNBLOCK
  60 Intersection of the current mask and the complement of
  61 .Fa set .
  62 .It Dv SIG_SETMASK
  63 .Fa set .
  64 .El
  65 .Pp
  66 If
  67 .Fa oset
  68 is not NULL, the previous signal mask is stored in the location pointed to by
  69 .Fa oset .
  70 .Pp
  71 .Dv SIGKILL
  72 and
  73 .Dv SIGSTOP
  74 cannot be blocked, and will be silently ignored if included in the signal mask.
  75 .Sh RETURN VALUES
  76 If successful,
  77 .Fn pthread_sigmask
  78 returns 0.
  79 Otherwise, an error is returned.
  80 .Sh ERRORS
  81 .Fn pthread_sigmask
  82 will fail if:
  83 .Bl -tag -width Er
  84 .It Bq Er EINVAL
  85 .Fa how
  86 is not one of the defined values.
  87 .El
  88 .Sh LEGACY SYNOPSIS
  89 .Fd #include <pthread.h>
  90 .Fd #include <signal.h>
  91 .Pp
  92 The include file
  93 .In pthread.h
  94 is necessary.
  95 .Sh SEE ALSO
  96 .Xr sigaction 2 ,
  97 .Xr sigpending 2 ,
  98 .Xr sigprocmask 2 ,
  99 .Xr sigsuspend 2 ,
 100 .Xr sigsetops 3 ,
 101 .Xr compat 5
 102 .Sh STANDARDS
 103 .Fn pthread_sigmask
 104 conforms to ISO/IEC 9945-1:1996 (``POSIX.1'')