76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/* Invoking main from __libc_start_main. nptl version.
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Copyright (C) 1998-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <atomic.h>
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#include <pthreadP.h>
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_Noreturn static void
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__libc_start_call_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
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int argc, char **argv
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#ifdef LIBC_START_MAIN_AUXVEC_ARG
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, ElfW(auxv_t) *auxvec
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#endif
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)
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{
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int result;
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/* Memory for the cancellation buffer. */
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struct pthread_unwind_buf unwind_buf;
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int not_first_call;
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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/* This call results in a -Wstringop-overflow warning because struct
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pthread_unwind_buf is smaller than jmp_buf. setjmp and longjmp
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do not use anything beyond the common prefix (they never access
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the saved signal mask), so that is a false positive. */
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DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overflow=");
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#endif
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not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
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DIAG_POP_NEEDS_COMMENT;
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if (__glibc_likely (! not_first_call))
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{
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struct pthread *self = THREAD_SELF;
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/* Store old info. */
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unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
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unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup);
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/* Store the new cleanup handler info. */
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THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf);
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/* Run the program. */
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result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
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}
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else
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{
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/* Remove the thread-local data. */
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__nptl_deallocate_tsd ();
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/* One less thread. Decrement the counter. If it is zero we
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terminate the entire process. */
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result = 0;
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if (atomic_fetch_add_relaxed (&__nptl_nthreads, -1) != 1)
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/* Not much left to do but to exit the thread, not the process. */
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while (1)
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INTERNAL_SYSCALL_CALL (exit, 0);
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}
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exit (result);
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}
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