The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/signal_ext.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/signal_ext.h

     1	/* System-specific extensions of <signal.h>, Linux version.
     2	   Copyright (C) 2019-2024 Free Software Foundation, Inc.
     3	   This file is part of the GNU C Library.
     4	
     5	   The GNU C Library is free software; you can redistribute it and/or
     6	   modify it under the terms of the GNU Lesser General Public
     7	   License as published by the Free Software Foundation; either
     8	   version 2.1 of the License, or (at your option) any later version.
     9	
    10	   The GNU C Library is distributed in the hope that it will be useful,
    11	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13	   Lesser General Public License for more details.
    14	
    15	   You should have received a copy of the GNU Lesser General Public
    16	   License along with the GNU C Library; if not, see
    17	   <https://www.gnu.org/licenses/>.  */
    18	
    19	#ifndef _SIGNAL_H
    20	# error "Never include <bits/signal_ext.h> directly; use <signal.h> instead."
    21	#endif
    22	
    23	#ifdef __USE_GNU
    24	
    25	/* Send SIGNAL to the thread TID in the thread group (process)
    26	   identified by TGID.  This function behaves like kill, but also
    27	   fails with ESRCH if the specified TID does not belong to the
    28	   specified thread group.  */
    29	extern int tgkill (__pid_t __tgid, __pid_t __tid, int __signal);
    30	
    31	#endif /* __USE_GNU */