1 #ifndef CCAN_FAILTEST_H
2 #define CCAN_FAILTEST_H
6 #include <ccan/compiler/compiler.h>
9 * failtest_init - initialize the failtest module
10 * @argc: the number of commandline arguments
11 * @argv: the commandline argument array
13 * This initializes the module, and in particular if argv[1] is "--failpath="
14 * then it ensures that failures follow that pattern. This allows easy
15 * debugging of complex failure paths.
17 void failtest_init(int argc, char *argv[]);
20 * failtest_exit - clean up and exit the test
21 * @status: the status (usually exit_status() from ccan/tap).
23 * This cleans up and changes to files made in this child, and exits the test.
24 * It also calls your failtest_default_hook, if any.
26 * A child which does not exit via failtest_exit() will cause the overall test
29 void NORETURN failtest_exit(int status);
32 * enum failtest_call_type - discriminator for failtest_call.u
34 enum failtest_call_type {
108 * struct failtest_call - description of a call redirected to failtest module
109 * @type: the call type
110 * @file: the filename of the caller
111 * @line: the line number of the caller
112 * @fail: did this call fail
113 * @error: the errno (if any)
114 * @u: the union of call data
116 * This structure is used to represent the ordered history of calls.
119 * failtest_hook, failtest_exit_check
121 struct failtest_call {
122 enum failtest_call_type type;
123 /* Where we were called from. */
128 /* What we set errno to. */
130 /* How do we clean this up? */
131 void (*cleanup)(void *u);
132 /* The actual call data. */
134 struct calloc_call calloc;
135 struct malloc_call malloc;
136 struct realloc_call realloc;
137 struct open_call open;
138 struct pipe_call pipe;
139 struct read_call read;
140 struct write_call write;
141 struct fcntl_call fcntl;
146 * failtest_hook - whether a certain call should fail or not.
147 * @history: the ordered history of all failtest calls.
148 * @num: the number of elements in @history (greater than 0)
150 * The default value of this hook is failtest_default_hook(), which returns
151 * true (ie. yes, fail the call).
153 * You can override it, and avoid failing certain calls. The parameters
154 * of the call (but not the return value(s)) will be filled in for the last
158 * static bool dont_fail_allocations(struct failtest_call *history,
161 * return history[num-1].type != FAILTEST_MALLOC
162 * && history[num-1].type != FAILTEST_CALLOC
163 * && history[num-1].type != FAILTEST_REALLOC;
166 * failtest_hook = dont_fail_allocations;
168 extern bool (*failtest_hook)(struct failtest_call *history, unsigned num);
171 * failtest_exit_check - hook for additional checks on a failed child.
172 * @history: the ordered history of all failtest calls.
173 * @num: the number of elements in @history (greater than 0)
175 * Your program might have additional checks to do on failure, such as
176 * check that a file is not corrupted, or than an error message has been
179 * If this returns false, the path to this failure will be printed and the
180 * overall test will fail.
182 extern bool (*failtest_exit_check)(struct failtest_call *history,
185 /* This usually fails the call. */
186 bool failtest_default_hook(struct failtest_call *history, unsigned num);
189 * failtest_timeout_ms - how long to wait before killing child.
191 * Default is 20,000 (20 seconds).
193 extern unsigned int failtest_timeout_ms;
194 #endif /* CCAN_FAILTEST_H */