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Diffstat (limited to 'REORG.TODO/stdlib/abort.c')
| -rw-r--r-- | REORG.TODO/stdlib/abort.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/REORG.TODO/stdlib/abort.c b/REORG.TODO/stdlib/abort.c new file mode 100644 index 0000000000..19882f3e3d --- /dev/null +++ b/REORG.TODO/stdlib/abort.c @@ -0,0 +1,142 @@ +/* Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <libc-lock.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sigsetops.h> + +/* Try to get a machine dependent instruction which will make the + program crash. This is used in case everything else fails. */ +#include <abort-instr.h> +#ifndef ABORT_INSTRUCTION +/* No such instruction is available. */ +# define ABORT_INSTRUCTION +#endif + +#include <libio/libioP.h> +#define fflush(s) _IO_flush_all_lockp (0) + +/* Exported variable to locate abort message in core files etc. */ +struct abort_msg_s *__abort_msg __attribute__ ((nocommon)); +libc_hidden_def (__abort_msg) + +/* We must avoid to run in circles. Therefore we remember how far we + already got. */ +static int stage; + +/* We should be prepared for multiple threads trying to run abort. */ +__libc_lock_define_initialized_recursive (static, lock); + + +/* Cause an abnormal program termination with core-dump. */ +void +abort (void) +{ + struct sigaction act; + sigset_t sigs; + + /* First acquire the lock. */ + __libc_lock_lock_recursive (lock); + + /* Now it's for sure we are alone. But recursive calls are possible. */ + + /* Unblock SIGABRT. */ + if (stage == 0) + { + ++stage; + __sigemptyset (&sigs); + __sigaddset (&sigs, SIGABRT); + __sigprocmask (SIG_UNBLOCK, &sigs, 0); + } + + /* Flush all streams. We cannot close them now because the user + might have registered a handler for SIGABRT. */ + if (stage == 1) + { + ++stage; + fflush (NULL); + } + + /* Send signal which possibly calls a user handler. */ + if (stage == 2) + { + /* This stage is special: we must allow repeated calls of + `abort' when a user defined handler for SIGABRT is installed. + This is risky since the `raise' implementation might also + fail but I don't see another possibility. */ + int save_stage = stage; + + stage = 0; + __libc_lock_unlock_recursive (lock); + + raise (SIGABRT); + + __libc_lock_lock_recursive (lock); + stage = save_stage + 1; + } + + /* There was a handler installed. Now remove it. */ + if (stage == 3) + { + ++stage; + memset (&act, '\0', sizeof (struct sigaction)); + act.sa_handler = SIG_DFL; + __sigfillset (&act.sa_mask); + act.sa_flags = 0; + __sigaction (SIGABRT, &act, NULL); + } + + /* Now close the streams which also flushes the output the user + defined handler might has produced. */ + if (stage == 4) + { + ++stage; + __fcloseall (); + } + + /* Try again. */ + if (stage == 5) + { + ++stage; + raise (SIGABRT); + } + + /* Now try to abort using the system specific command. */ + if (stage == 6) + { + ++stage; + ABORT_INSTRUCTION; + } + + /* If we can't signal ourselves and the abort instruction failed, exit. */ + if (stage == 7) + { + ++stage; + _exit (127); + } + + /* If even this fails try to use the provided instruction to crash + or otherwise make sure we never return. */ + while (1) + /* Try for ever and ever. */ + ABORT_INSTRUCTION; +} +libc_hidden_def (abort) |