1 /* Invoking main from __libc_start_main. nptl version.
2 Copyright (C) 1998-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
23 __libc_start_call_main (int (*main
) (int, char **, char ** MAIN_AUXVEC_DECL
),
25 #ifdef LIBC_START_MAIN_AUXVEC_ARG
26 , ElfW(auxv_t
) *auxvec
32 /* Memory for the cancellation buffer. */
33 struct pthread_unwind_buf unwind_buf
;
36 DIAG_PUSH_NEEDS_COMMENT
;
37 #if __GNUC_PREREQ (7, 0)
38 /* This call results in a -Wstringop-overflow warning because struct
39 pthread_unwind_buf is smaller than jmp_buf. setjmp and longjmp
40 do not use anything beyond the common prefix (they never access
41 the saved signal mask), so that is a false positive. */
42 DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overflow=");
44 not_first_call
= setjmp ((struct __jmp_buf_tag
*) unwind_buf
.cancel_jmp_buf
);
45 DIAG_POP_NEEDS_COMMENT
;
46 if (__glibc_likely (! not_first_call
))
48 struct pthread
*self
= THREAD_SELF
;
51 unwind_buf
.priv
.data
.prev
= THREAD_GETMEM (self
, cleanup_jmp_buf
);
52 unwind_buf
.priv
.data
.cleanup
= THREAD_GETMEM (self
, cleanup
);
54 /* Store the new cleanup handler info. */
55 THREAD_SETMEM (self
, cleanup_jmp_buf
, &unwind_buf
);
57 /* Run the program. */
58 result
= main (argc
, argv
, __environ MAIN_AUXVEC_PARAM
);
62 /* Remove the thread-local data. */
63 __nptl_deallocate_tsd ();
65 /* One less thread. Decrement the counter. If it is zero we
66 terminate the entire process. */
68 if (atomic_fetch_add_relaxed (&__nptl_nthreads
, -1) != 1)
69 /* Not much left to do but to exit the thread, not the process. */
71 INTERNAL_SYSCALL_CALL (exit
, 0);