mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-13 09:57:03 +00:00
8922ab5d6a
To be able to test errors at specific locations, add a simple way to
check for a condition in code and controlled from user space environment
variable INJECT. For now a single value is accepted.
Use like:
if (inject_error(0x1234)) {
do_something();
return -ERROR;
}
This is enabled in debugging build by default (make D=1) and can be
enabled on demand too (make EXTRA_CFLAGS=-DINJECT).
Signed-off-by: David Sterba <dsterba@suse.com>
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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/*
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* Simple error injection framework. Enabled at build time by -DINJECT.
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*/
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#include "inject-error.h"
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#ifdef INJECT
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static bool inject_verbose = true;
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static bool cookie_enabled(unsigned long cookie) {
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const char *inj = getenv("INJECT");
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unsigned long envcookie;
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if (inj == NULL || inj[0] == 0)
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return false;
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envcookie = strtoul(inj, NULL, 0);
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if (envcookie == cookie)
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return true;
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return false;
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}
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#define inject_error(cookie) __inject_error((cookie), __FILE__, __LINE__)
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bool __inject_error(unsigned long cookie, const char *file, int line) {
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if (cookie == 0x0) {
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fprintf(stderr, "Error injection testing cookie 0x0\n");
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return true;
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}
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if (cookie_enabled(cookie)) {
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if (inject_verbose)
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fprintf(stderr, "Error injection: cookie 0x%lx in %s:%d\n",
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cookie, file, line);
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return true;
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}
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return false;
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}
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#else
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#define inject_error(cookie) (false)
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#endif
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#ifdef DEMO
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#include <unistd.h>
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/* gcc -o inject-error inject-error.c -DDEMO */
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int work(int x) {
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sleep(1);
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printf("x=%d\n", x);
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if (x == 3 && inject_error(0x03)) {
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printf("error injected\n");
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return -1;
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}
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return 0;
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}
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int main() {
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int ret = 0;
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int x = 1;
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printf("Injection: INJECT=%s\n", getenv("INJECT"));
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while (ret == 0) {
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ret = work(x);
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x++;
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}
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return 0;
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}
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#endif
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