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SIGPROCMASK(2)             Linux Programmer's Manual            SIGPROCMASK(2)



NAME
       sigprocmask - examine and change blocked signals

SYNOPSIS
       #include <signal.h>

       int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigprocmask(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

DESCRIPTION
       sigprocmask() is used to fetch and/or change the signal mask of the calling thread.
       The signal mask is the set of signals whose delivery is currently blocked  for  the
       caller (see also signal(7) for more details).

       The behavior of the call is dependent on the value of how, as follows.

       SIG_BLOCK
              The set of blocked signals is the union of the current set and the set argu-
              ment.

       SIG_UNBLOCK
              The signals in set are removed from the current set of blocked signals.   It
              is permissible to attempt to unblock a signal which is not blocked.

       SIG_SETMASK
              The set of blocked signals is set to the argument set.

       If oldset is non-null, the previous value of the signal mask is stored in oldset.

       If  set  is NULL, then the signal mask is unchanged (i.e., how is ignored), but the
       current value of the signal mask is nevertheless returned in oldset (if it  is  not
       NULL).

       The   use   of  sigprocmask()  is  unspecified  in  a  multithreaded  process;  see
       pthread_sigmask(3).

RETURN VALUE
       sigprocmask() returns 0 on success and -1 on error.

ERRORS
       EINVAL The value specified in how was invalid.

CONFORMING TO
       POSIX.1-2001.

NOTES
       It is not possible to block SIGKILL or SIGSTOP.  Attempts to  do  so  are  silently
       ignored.

       Each of the threads in a process has its own signal mask.

       A child created via fork(2) inherits a copy of its parent's signal mask; the signal
       mask is preserved across execve(2).

       If SIGBUS, SIGFPE, SIGILL, or SIGSEGV are generated while  they  are  blocked,  the
       result  is  undefined, unless the signal was generated by the kill(2), sigqueue(2),
       or raise(3).

       See sigsetops(3) for details on manipulating signal sets.

SEE ALSO
       kill(2), pause(2), sigaction(2),  signal(2),  sigpending(2),  sigqueue(2),  sigsus-
       pend(2), pthread_sigmask(3), sigsetops(3), signal(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-10-17                    SIGPROCMASK(2)

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