SIGSETJMP(3)               POSIX Programmer's Manual              SIGSETJMP(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
       sigsetjmp -- set jump point for a non-local goto

SSYYNNOOPPSSIISS
       #include <setjmp.h>

       int sigsetjmp(sigjmp_buf _e_n_v, int _s_a_v_e_m_a_s_k);

DDEESSCCRRIIPPTTIIOONN
       The _s_i_g_s_e_t_j_m_p() function shall be equivalent to the _s_e_t_j_m_p() function,
       except as follows:

        *  References to _s_e_t_j_m_p() are equivalent to _s_i_g_s_e_t_j_m_p().

        *  References to _l_o_n_g_j_m_p() are equivalent to _s_i_g_l_o_n_g_j_m_p().

        *  If the value of the _s_a_v_e_m_a_s_k argument is not 0, _s_i_g_s_e_t_j_m_p() shall
           also save the current signal mask of the calling thread as part of
           the calling environment.

RREETTUURRNN VVAALLUUEE
       If the return is from a successful direct invocation, _s_i_g_s_e_t_j_m_p() shall
       return 0. If the return is from a call to _s_i_g_l_o_n_g_j_m_p(), _s_i_g_s_e_t_j_m_p()
       shall return a non-zero value.

EERRRROORRSS
       No errors are defined.

       _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
       The distinction between _s_e_t_j_m_p()/_l_o_n_g_j_m_p() and _s_i_g_s_e_t_j_m_p()/_s_i_g_l_o_n_g_j_m_p()
       is only significant for programs which use _s_i_g_a_c_t_i_o_n(), _s_i_g_p_r_o_c_m_a_s_k(),
       or _s_i_g_s_u_s_p_e_n_d().

       Note that since this function is defined in terms of _s_e_t_j_m_p(), if
       _s_a_v_e_m_a_s_k is zero, it is unspecified whether the signal mask is saved.

RRAATTIIOONNAALLEE
       The ISO C standard specifies various restrictions on the usage of the
       _s_e_t_j_m_p() macro in order to permit implementors to recognize the name in
       the compiler and not implement an actual function. These same
       restrictions apply to the _s_i_g_s_e_t_j_m_p() macro.

       There are processors that cannot easily support these calls, but this
       was not considered a sufficient reason to exclude them.

       4.2 BSD, 4.3 BSD, and XSI-conformant systems provide functions named
       ___s_e_t_j_m_p() and ___l_o_n_g_j_m_p() that, together with _s_e_t_j_m_p() and _l_o_n_g_j_m_p(),
       provide the same functionality as _s_i_g_s_e_t_j_m_p() and _s_i_g_l_o_n_g_j_m_p().  On
       those systems, _s_e_t_j_m_p() and _l_o_n_g_j_m_p() save and restore signal masks,
       while ___s_e_t_j_m_p() and ___l_o_n_g_j_m_p() do not. On System V Release 3 and in
       corresponding issues of the SVID, _s_e_t_j_m_p() and _l_o_n_g_j_m_p() are explicitly
       defined not to save and restore signal masks. In order to permit
       existing practice in both cases, the relation of _s_e_t_j_m_p() and _l_o_n_g_j_m_p()
       to signal masks is not specified, and a new set of functions is defined
       instead.

       The _l_o_n_g_j_m_p() and _s_i_g_l_o_n_g_j_m_p() functions operate as in the previous
       issue provided the matching _s_e_t_j_m_p() or _s_i_g_s_e_t_j_m_p() has been performed
       in the same thread. Non-local jumps into contexts saved by other
       threads would be at best a questionable practice and were not
       considered worthy of standardization.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _p_t_h_r_e_a_d___s_i_g_m_a_s_k(), _s_i_g_l_o_n_g_j_m_p(), _s_i_g_n_a_l(), _s_i_g_s_u_s_p_e_n_d()

       The Base Definitions volume of POSIX.1-2017, <<sseettjjmmpp..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                         SIGSETJMP(3)
