PSIGINFO(3)                POSIX Programmer's Manual               PSIGINFO(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
       psiginfo, psignal -- write signal information to standard error

SSYYNNOOPPSSIISS
       #include <signal.h>

       void psiginfo(const siginfo_t *_p_i_n_f_o, const char *_m_e_s_s_a_g_e);
       void psignal(int _s_i_g_n_u_m, const char *_m_e_s_s_a_g_e);

DDEESSCCRRIIPPTTIIOONN
       The _p_s_i_g_i_n_f_o() and _p_s_i_g_n_a_l() functions shall write a language-dependent
       message associated with a signal number to the standard error stream as
       follows:

        *  First, if _m_e_s_s_a_g_e is not a null pointer and is not the empty
           string, the string pointed to by the _m_e_s_s_a_g_e argument shall be
           written, followed by a <colon> and a <space>.

        *  Then the signal description string associated with _s_i_g_n_u_m or with
           the signal indicated by _p_i_n_f_o shall be written, followed by a
           <newline>.

       For _p_s_i_g_i_n_f_o(), the application shall ensure that the argument _p_i_n_f_o
       references a valid ssiiggiinnffoo__tt structure. For _p_s_i_g_n_a_l(), if _s_i_g_n_u_m is not
       a valid signal number, the behavior is implementation-defined.

       The _p_s_i_g_i_n_f_o() and _p_s_i_g_n_a_l() functions shall not change the orientation
       of the standard error stream.

       The _p_s_i_g_i_n_f_o() and _p_s_i_g_n_a_l() functions shall mark for update the last
       data modification and last file status change timestamps of the file
       associated with the standard error stream at some time between their
       successful completion and _e_x_i_t(), _a_b_o_r_t(), or the completion of
       _f_f_l_u_s_h() or _f_c_l_o_s_e() on _s_t_d_e_r_r.

       The _p_s_i_g_i_n_f_o() and _p_s_i_g_n_a_l() functions shall not change the setting of
       _e_r_r_n_o if successful.

       On error, the _p_s_i_g_i_n_f_o() and _p_s_i_g_n_a_l() functions shall set the error
       indicator for the stream to which _s_t_d_e_r_r points, and shall set _e_r_r_n_o to
       indicate the error.

       Since no value is returned, an application wishing to check for error
       situations should set _e_r_r_n_o to 0, then call _p_s_i_g_i_n_f_o() or _p_s_i_g_n_a_l(),
       then check _e_r_r_n_o.

RREETTUURRNN VVAALLUUEE
       These functions shall not return a value.

EERRRROORRSS
       Refer to _f_p_u_t_c().

       _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
       As an alternative to setting _e_r_r_n_o to zero before the call and checking
       if it is non-zero afterwards, applications can use _f_e_r_r_o_r() to detect
       whether _p_s_i_g_i_n_f_o() or _p_s_i_g_n_a_l() encountered an error.

       An application wishing to use this method to check for error situations
       should call _c_l_e_a_r_e_r_r(_s_t_d_e_r_r) before calling _p_s_i_g_i_n_f_o() or _p_s_i_g_n_a_l(),
       then if _f_e_r_r_o_r(_s_t_d_e_r_r) returns non-zero, the value of _e_r_r_n_o indicates
       which error occurred.

RRAATTIIOONNAALLEE
       System V historically has _p_s_i_g_n_a_l() and _p_s_i_g_i_n_f_o() in _<_s_i_g_i_n_f_o_._h_>.
       However, the _<_s_i_g_i_n_f_o_._h_> header is not specified in the Base
       Definitions volume of POSIX.1-2017, and the type ssiiggiinnffoo__tt is defined
       in _<_s_i_g_n_a_l_._h_>.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _f_p_u_t_c(), _p_e_r_r_o_r(), _s_t_r_s_i_g_n_a_l()

       The Base Definitions volume of POSIX.1-2017, <<ssiiggnnaall..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                          PSIGINFO(3)
