PAUSE(3)                   POSIX Programmer's Manual                  PAUSE(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       pause -- suspend the thread until a signal is received

SSYYNNOOPPSSIISS
       #include <unistd.h>

       int pause(void);

DDEESSCCRRIIPPTTIIOONN
       The _p_a_u_s_e() function shall suspend the calling thread until delivery of
       a signal whose action is either to execute a signal-catching function
       or to terminate the process.

       If the action is to terminate the process, _p_a_u_s_e() shall not return.

       If the action is to execute a signal-catching function, _p_a_u_s_e() shall
       return after the signal-catching function returns.

RREETTUURRNN VVAALLUUEE
       Since _p_a_u_s_e() suspends thread execution indefinitely unless interrupted
       by a signal, there is no successful completion return value. A value of
       -1 shall be returned and _e_r_r_n_o set to indicate the error.

EERRRROORRSS
       The _p_a_u_s_e() function shall fail if:

       EEIINNTTRR  A signal is caught by the calling process and control is
              returned from the signal-catching function.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       Many common uses of _p_a_u_s_e() have timing windows. The scenario involves
       checking a condition related to a signal and, if the signal has not
       occurred, calling _p_a_u_s_e().  When the signal occurs between the check
       and the call to _p_a_u_s_e(), the process often blocks indefinitely. The
       _s_i_g_p_r_o_c_m_a_s_k() and _s_i_g_s_u_s_p_e_n_d() functions can be used to avoid this type
       of problem.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _s_i_g_s_u_s_p_e_n_d()

       The Base Definitions volume of POSIX.1-2017, <<uunniissttdd..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                             PAUSE(3)
