sigpause(3)

1sigpause(3)                Library Functions Manual                sigpause(3)
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NAME

6       sigpause - atomically release blocked signals and wait for interrupt
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <signal.h>
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14       [[deprecated]] int sigpause(int sigmask);  /* BSD (but see NOTES) */
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16       [[deprecated]] int sigpause(int sig);      /* POSIX.1 / SysV / UNIX 95 */
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DESCRIPTION

19       Don't use this function.  Use sigsuspend(2) instead.
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21       The  function  sigpause()  is  designed  to  wait  for some signal.  It
22       changes the process's signal mask (set of blocked  signals),  and  then
23       waits  for  a signal to arrive.  Upon arrival of a signal, the original
24       signal mask is restored.
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RETURN VALUE

27       If sigpause() returns, it was interrupted by a signal  and  the  return
28       value is -1 with errno set to EINTR.
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ATTRIBUTES

31       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
32       tributes(7).
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34       ┌────────────────────────────────────────────┬───────────────┬─────────┐
35       │Interface                                   │ Attribute     │ Value   │
36       ├────────────────────────────────────────────┼───────────────┼─────────┤
37       │sigpause()                                  │ Thread safety │ MT-Safe │
38       └────────────────────────────────────────────┴───────────────┴─────────┘
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VERSIONS

41       On Linux, this routine is a system call only  on  the  Sparc  (sparc64)
42       architecture.
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44       glibc  uses  the  BSD  version if the _BSD_SOURCE feature test macro is
45       defined and  none  of  _POSIX_SOURCE,  _POSIX_C_SOURCE,  _XOPEN_SOURCE,
46       _GNU_SOURCE,  or  _SVID_SOURCE  is  defined.   Otherwise,  the System V
47       version is used, and feature test macros must be defined as follows  to
48       obtain the declaration:
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50       •  Since glibc 2.26: _XOPEN_SOURCE >= 500
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52       •  glibc 2.25 and earlier: _XOPEN_SOURCE
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54       Since  glibc  2.19, only the System V version is exposed by <signal.h>;
55       applications that formerly used the BSD sigpause() should be amended to
56       use sigsuspend(2).
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STANDARDS

59       POSIX.1-2008.
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HISTORY

62       POSIX.1-2001.  Obsoleted in POSIX.1-2008.
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64       The classical BSD version of this function appeared in 4.2BSD.  It sets
65       the process's  signal  mask  to  sigmask.   UNIX  95  standardized  the
66       incompatible  System V version of this function, which removes only the
67       specified signal sig from the process's signal mask.   The  unfortunate
68       situation with two incompatible functions with the same name was solved
69       by  the  sigsuspend(2)  function,  that  takes  a  sigset_t *  argument
70       (instead of an int).
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