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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#define MAX_SIGNALS 32
#define print(fmt, ...) fprintf(stderr, "test_program: "fmt, ##__VA_ARGS__)
_Bool do_raise = 0;
int raise_signal;
_Bool do_Com_Error = 0;
_Bool recursive = 0;
enum { DEFAULT = 0, CATCH, IGNORE };
int handle[MAX_SIGNALS] = {0};
_Bool handle_any = 0;
_Bool verbose = 0;
static int read_args(int argc, char **argv)
{
for (int i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--raise")) {
if (i + 1 >= argc)
goto needs_argument;
do_raise = 1;
raise_signal = atoi(argv[i + 1]);
i++;
} else if (!strcmp(argv[i], "--Com_Error")) {
do_Com_Error = 1;
} else if (!strcmp(argv[i], "--recursive")) {
recursive = 1;
} else if (!strcmp(argv[i], "--catch") ||
!strcmp(argv[i], "--ignore")) {
int sig;
if (i + 1 >= argc)
goto needs_argument;
sig = atoi(argv[i + 1]);
if (sig < 0 || sig >= MAX_SIGNALS) {
print("invalid argument for --catch/--ignore: %i\n",
sig);
return 1;
}
if (!strcmp(argv[i], "--catch"))
handle[sig] = CATCH;
else
handle[sig] = IGNORE;
handle_any = 1;
i++;
} else if (!strcmp(argv[i], "--ignore")) {
} else if (!strcmp(argv[i], "--verbose")) {
verbose = 1;
} else {
print("invalid option '%s'\n", argv[i]);
return 1;
}
continue;
needs_argument:
print("option '%s' needs an argument\n", argv[i]);
return 1;
}
if (do_Com_Error && do_raise) {
print("--raise and --Com_Error are mutually exclusive.\n");
return 1;
}
return 0;
}
_Noreturn void graceful_exit(void)
{
print("Graceful exit.\n");
exit(0);
}
void signal_catcher(int sig)
{
print("Caught signal %i.\n", sig);
if (recursive) {
if (verbose)
print("Raising signal %i from within the handler.\n",
raise_signal);
raise(raise_signal);
}
graceful_exit();
}
_Noreturn void Com_Error(int type, const char *str)
{
print("Com_Error: %s\n", str);
if (recursive)
Com_Error(666, "Error while erroring");
graceful_exit();
}
int main(int argc, char **argv)
{
int rv;
rv = read_args(argc, argv);
if (rv)
return rv;
for (int i = 0; i < MAX_SIGNALS; i++) {
void (*fun)(int);
switch (handle[i]) {
case DEFAULT:
continue;
case CATCH:
fun = signal_catcher;
if (verbose)
print("Signal %i will be caught.\n", i);
break;
case IGNORE:
fun = SIG_IGN;
if (verbose)
print("Signal %i will be ignored.\n", i);
break;
}
if (signal(i, fun) == SIG_ERR) {
print("For signal %i: ", i);
perror("signal");
return 1;
}
}
if (do_raise) {
print("Raising signal %i.\n", raise_signal);
raise(raise_signal);
}
if (do_Com_Error)
Com_Error(123, "Some error string");
print("Reached the end of main().\n");
graceful_exit();
}
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