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    Command:

    sighold

    
         Standard C Library (libc, -lc)
    
    
    

    SYNOPSIS

         #include <signal.h>
    
         int
         sighold(int sig);
    
         int
         sigignore(int sig);
    
         int
         xsi_sigpause(int sigmask);
    
         int
         sigrelse(int sig);
    
         void (*)(int)
         sigset(int, void (*disp)(int));
    
         int
         sigpause(int sigmask);
    
    
    

    DESCRIPTION

         This interface is made obsolete by sigsuspend(2) and sigaction(2)
    
         The sigset() function modifies signal dispositions.  The sig argument
         specifies the signal, which may be any signal except SIGKILL and SIGSTOP.
         The disp argument specifies the signal's disposition, which may be
         SIG_DFL, SIG_IGN, or the address of a signal handler.  If sigset() is
         used, and disp is the address of a signal handler, the system adds sig to
         the signal mask of the calling process before executing the signal han-
         dler; when the signal handler returns, the system restores the signal
         mask of the calling process to its state prior to the delivery of the
         signal.  In addition, if sigset() is used, and disp is equal to SIG_HOLD,
         sig is added to the signal mask of the calling process and sig 's dispo-
         sition remains unchanged.  If sigset() is used, and disp is not equal to
         SIG_HOLD, sig is removed from the signal mask of the calling process.
    
         The sighold() function adds sig to the signal mask of the calling pro-
         cess.
    
         The sigrelse() function removes sig from the signal mask of the calling
         process.
    
         The sigignore() function sets the disposition of sig to SIG_IGN.
    
         The xsi_sigpause() function removes sig from the signal mask of the call-
         ing process and suspend the calling process until a signal is received.
         The xsi_sigpause() function restores the signal mask of the process to
         its original state before returning.
    
         For all other functions, upon successful completion, 0 is returned.  Oth-
         erwise, -1 is returned and errno is set to indicate the error:
    
         [EINVAL]           The sig argument is not a valid signal number.
    
         [EINVAL]           For sigset() and sigignore() functions, an attempt was
                            made to catch or ignore SIGKILL or SIGSTOP.
    
    
    

    SEE ALSO

         kill(2), sigaction(2), sigblock(2), sigprocmask(2), sigsuspend(2),
         sigvec(2)
    
    
    

    STANDARDS

         The sigpause() function is implemented for compatibility with historic
         4.3BSD applications.  An incompatible interface by the same name, which
         used a single signal number rather than a mask, was present in AT&T
         System V UNIX, and was copied from there into the X/Open System
         Interfaces (XSI) option of IEEE Std 1003.1-2001 ("POSIX.1").  FreeBSD
         implements it under the name xsi_sigpause().  The sighold(), sigignore(),
         sigrelse() and sigset() functions are implemented for compatibility with
         System V and XSI interfaces.
    
    
    

    HISTORY

         The sigpause() function appeared in 4.2BSD and has been deprecated.  All
         other functions appeared in FreeBSD 8.1 and were deprecated before being
         implemented.
    
    
    

    BSD June 2, 1993 BSD

    
    
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