| 1 | /* Invoking main from __libc_start_main. nptl version. |
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| 2 | Copyright (C) 1998-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <atomic.h> |
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| 20 | #include <pthreadP.h> |
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| 21 | |
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| 22 | _Noreturn static void |
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| 23 | __libc_start_call_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), |
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| 24 | int argc, char **argv |
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| 25 | #ifdef LIBC_START_MAIN_AUXVEC_ARG |
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| 26 | , ElfW(auxv_t) *auxvec |
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| 27 | #endif |
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| 28 | ) |
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| 29 | { |
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| 30 | int result; |
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| 31 | |
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| 32 | /* Memory for the cancellation buffer. */ |
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| 33 | struct pthread_unwind_buf unwind_buf; |
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| 34 | |
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| 35 | int not_first_call; |
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| 36 | DIAG_PUSH_NEEDS_COMMENT; |
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| 37 | #if __GNUC_PREREQ (7, 0) |
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| 38 | /* This call results in a -Wstringop-overflow warning because struct |
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| 39 | pthread_unwind_buf is smaller than jmp_buf. setjmp and longjmp |
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| 40 | do not use anything beyond the common prefix (they never access |
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| 41 | the saved signal mask), so that is a false positive. */ |
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| 42 | DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overflow=" ); |
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| 43 | #endif |
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| 44 | not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf); |
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| 45 | DIAG_POP_NEEDS_COMMENT; |
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| 46 | if (__glibc_likely (! not_first_call)) |
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| 47 | { |
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| 48 | struct pthread *self = THREAD_SELF; |
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| 49 | |
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| 50 | /* Store old info. */ |
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| 51 | unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf); |
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| 52 | unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup); |
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| 53 | |
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| 54 | /* Store the new cleanup handler info. */ |
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| 55 | THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf); |
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| 56 | |
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| 57 | /* Run the program. */ |
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| 58 | result = main (argc, argv, __environ MAIN_AUXVEC_PARAM); |
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| 59 | } |
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| 60 | else |
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| 61 | { |
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| 62 | /* Remove the thread-local data. */ |
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| 63 | __nptl_deallocate_tsd (); |
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| 64 | |
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| 65 | /* One less thread. Decrement the counter. If it is zero we |
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| 66 | terminate the entire process. */ |
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| 67 | result = 0; |
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| 68 | if (! atomic_decrement_and_test (&__nptl_nthreads)) |
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| 69 | /* Not much left to do but to exit the thread, not the process. */ |
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| 70 | while (1) |
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| 71 | INTERNAL_SYSCALL_CALL (exit, 0); |
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| 72 | } |
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| 73 | |
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| 74 | exit (result); |
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| 75 | } |
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| 76 | |
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