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Linux 2.6 - man page for sigprocmask (linux section 3posix)

PTHREAD_SIGMASK(P)		    POSIX Programmer's Manual		       PTHREAD_SIGMASK(P)

       pthread_sigmask, sigprocmask - examine and change blocked signals

       #include <signal.h>

       int pthread_sigmask(int how, const sigset_t *restrict set,
	      sigset_t *restrict oset);

       int sigprocmask(int how, const sigset_t *restrict set,
	      sigset_t *restrict oset);

       The pthread_sigmask() function shall examine or change (or both) the calling thread's sig-
       nal mask, regardless of the number of threads in the process. The function shall be equiv-
       alent to sigprocmask(), without the restriction that the call be made in a single-threaded

       In a single-threaded process, the sigprocmask() function shall examine or change (or both)
       the signal mask of the calling thread.

       If  the	argument  set  is not a null pointer, it points to a set of signals to be used to
       change the currently blocked set.

       The argument how indicates the way in which the set is changed, and the application  shall
       ensure it consists of one of the following values:

	      The  resulting set shall be the union of the current set and the signal set pointed
	      to by set.

	      The resulting set shall be the signal set pointed to by set.

	      The resulting set shall be the intersection of the current set and  the  complement
	      of the signal set pointed to by set.

       If the argument oset is not a null pointer, the previous mask shall be stored in the loca-
       tion pointed to by oset.  If set is a null pointer, the value of the argument how  is  not
       significant  and the process' signal mask shall be unchanged; thus the call can be used to
       enquire about currently blocked signals.

       If there are any pending unblocked signals after the call to sigprocmask(), at  least  one
       of those signals shall be delivered before the call to sigprocmask() returns.

       It is not possible to block those signals which cannot be ignored.  This shall be enforced
       by the system without causing an error to be indicated.

       If any of the SIGFPE, SIGILL, SIGSEGV, or SIGBUS signals  are  generated  while	they  are
       blocked,  the result is undefined, unless the signal was generated by the kill() function,
       the sigqueue() function, or the raise() function.

       If sigprocmask() fails, the thread's signal mask shall not be changed.

       The use of the sigprocmask() function is unspecified in a multi-threaded process.

       Upon successful completion pthread_sigmask() shall return 0; otherwise,	it  shall  return
       the corresponding error number.

       Upon successful completion, sigprocmask() shall return 0; otherwise, -1 shall be returned,
       errno shall be set to indicate the error, and the process' signal mask shall be unchanged.

       The pthread_sigmask()  and sigprocmask() functions shall fail if:

       EINVAL The value of the how argument is not equal to one of the defined values.

       The pthread_sigmask() function shall not return an error code of [EINTR].

       The following sections are informative.



       When a process' signal mask is changed in a signal-catching function that is installed  by
       sigaction(),  the  restoration of the signal mask on return from the signal-catching func-
       tion overrides  that  change  (see  sigaction()).  If  the  signal-catching  function  was
       installed with signal(), it is unspecified whether this occurs.

       See kill() for a discussion of the requirement on delivery of signals.


       sigaction()  ,  sigaddset() , sigdelset() , sigemptyset() , sigfillset() , sigismember() ,
       sigpending()  ,	sigqueue()  ,	sigsuspend()   ,   the	 Base	Definitions   volume   of
       IEEE Std 1003.1-2001, <signal.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003			       PTHREAD_SIGMASK(P)

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