f93cf255d4
Closes #238 Update all files to list SPDX license shortname. Most files are BSD 3 clause license. The exceptions are: serge@sl ~/src/shadow$ git grep SPDX-License | grep -v BSD-3-Clause contrib/atudel:# SPDX-License-Identifier: BSD-4-Clause lib/tcbfuncs.c: * SPDX-License-Identifier: 0BSD libmisc/salt.c: * SPDX-License-Identifier: Unlicense src/login_nopam.c: * SPDX-License-Identifier: Unlicense src/nologin.c: * SPDX-License-Identifier: BSD-2-Clause src/vipw.c: * SPDX-License-Identifier: GPL-2.0-or-later Signed-off-by: Serge Hallyn <serge@hallyn.com>
122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/*
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* SPDX-FileCopyrightText: 2008 - 2011, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#include <assert.h>
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#include <stdio.h>
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#include "prototypes.h"
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/*
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* The cleanup_functions stack.
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*/
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#define CLEANUP_FUNCTIONS 10
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typedef /*@null@*/void * parg_t;
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static cleanup_function cleanup_functions[CLEANUP_FUNCTIONS];
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static parg_t cleanup_function_args[CLEANUP_FUNCTIONS];
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static pid_t cleanup_pid = 0;
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/*
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* - Cleanup functions shall not fail.
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* - You should register do_cleanups with atexit.
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* - You should add cleanup functions to the stack with add_cleanup when
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* an operation is expected to be executed later, and remove it from the
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* stack with del_cleanup when it has been executed.
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*
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**/
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/*
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* do_cleanups - perform the actions stored in the cleanup_functions stack.
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*
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* Cleanup action are not executed on exit of the processes started by the
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* parent (first caller of add_cleanup).
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*
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* It is intended to be used as:
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* atexit (do_cleanups);
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*/
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void do_cleanups (void)
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{
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unsigned int i;
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/* Make sure there were no overflow */
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assert (NULL == cleanup_functions[CLEANUP_FUNCTIONS-1]);
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if (getpid () != cleanup_pid) {
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return;
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}
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i = CLEANUP_FUNCTIONS;
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do {
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i--;
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if (cleanup_functions[i] != NULL) {
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cleanup_functions[i] (cleanup_function_args[i]);
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}
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} while (i>0);
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}
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/*
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* add_cleanup - Add a cleanup_function to the cleanup_functions stack.
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*/
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void add_cleanup (/*@notnull@*/cleanup_function pcf, /*@null@*/void *arg)
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{
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unsigned int i;
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assert (NULL != pcf);
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assert (NULL == cleanup_functions[CLEANUP_FUNCTIONS-2]);
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if (0 == cleanup_pid) {
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cleanup_pid = getpid ();
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}
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/* Add the cleanup_function at the end of the stack */
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for (i=0; NULL != cleanup_functions[i]; i++);
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cleanup_functions[i] = pcf;
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cleanup_function_args[i] = arg;
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}
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/*
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* del_cleanup - Remove a cleanup_function from the cleanup_functions stack.
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*/
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void del_cleanup (/*@notnull@*/cleanup_function pcf)
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{
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unsigned int i;
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assert (NULL != pcf);
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/* Find the pcf cleanup function */
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for (i=0; i<CLEANUP_FUNCTIONS; i++) {
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if (cleanup_functions[i] == pcf) {
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break;
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}
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}
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/* Make sure the cleanup function was found */
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assert (i<CLEANUP_FUNCTIONS);
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/* Move the rest of the cleanup functions */
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for (; i<CLEANUP_FUNCTIONS; i++) {
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/* Make sure the cleanup function was specified only once */
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assert ( (i == (CLEANUP_FUNCTIONS -1))
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|| (cleanup_functions[i+1] != pcf));
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if (i == (CLEANUP_FUNCTIONS -1)) {
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cleanup_functions[i] = NULL;
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cleanup_function_args[i] = NULL;
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} else {
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cleanup_functions[i] = cleanup_functions[i+1];
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cleanup_function_args[i] = cleanup_function_args[i+1];
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}
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/* A NULL indicates the end of the stack */
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if (NULL == cleanup_functions[i]) {
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break;
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}
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}
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}
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