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130fca17 | 1 | /* Invoking main from __libc_start_main. nptl version. |
6d7e8eda | 2 | Copyright (C) 1998-2023 Free Software Foundation, Inc. |
130fca17 FW |
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 | #include <atomic.h> | |
3c79234c | 20 | #include <pthreadP.h> |
130fca17 FW |
21 | |
22 | _Noreturn static void | |
23 | __libc_start_call_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), | |
24 | int argc, char **argv | |
25 | #ifdef LIBC_START_MAIN_AUXVEC_ARG | |
26 | , ElfW(auxv_t) *auxvec | |
27 | #endif | |
28 | ) | |
29 | { | |
30 | int result; | |
31 | ||
32 | /* Memory for the cancellation buffer. */ | |
33 | struct pthread_unwind_buf unwind_buf; | |
34 | ||
35 | int not_first_call; | |
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="); | |
43 | #endif | |
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)) | |
47 | { | |
48 | struct pthread *self = THREAD_SELF; | |
49 | ||
50 | /* Store old info. */ | |
51 | unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf); | |
52 | unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup); | |
53 | ||
54 | /* Store the new cleanup handler info. */ | |
55 | THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf); | |
56 | ||
57 | /* Run the program. */ | |
58 | result = main (argc, argv, __environ MAIN_AUXVEC_PARAM); | |
59 | } | |
60 | else | |
61 | { | |
62 | /* Remove the thread-local data. */ | |
130fca17 | 63 | __nptl_deallocate_tsd (); |
130fca17 FW |
64 | |
65 | /* One less thread. Decrement the counter. If it is zero we | |
66 | terminate the entire process. */ | |
67 | result = 0; | |
4a07fbb6 | 68 | if (atomic_fetch_add_relaxed (&__nptl_nthreads, -1) != 1) |
130fca17 | 69 | /* Not much left to do but to exit the thread, not the process. */ |
eaa53d0f AZ |
70 | while (1) |
71 | INTERNAL_SYSCALL_CALL (exit, 0); | |
130fca17 FW |
72 | } |
73 | ||
74 | exit (result); | |
75 | } |