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// Copyright © 2014 Richard Kettlewell.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <config.h>
#include "Utils.h"
#include "Errors.h"
#include "Command.h"
#include <cassert>
#include <pthread.h>
#include <unistd.h>
#include <cstdio>
static FILE *input;
static int output;
static bool result;
static void *background(void *) {
result = check("%s", "spong");
return NULL;
}
/* We can't use stdio here because reading from an unbuffered file causes a
* flush of other files, which (at least in Glibc) implies taking a lock on
* other files. Since the background thread is blocked in a read, holding a
* lock while it does so, a deadlock results.
*
* References:
* - C99 7.19.3#3
* - http://austingroupbugs.net/view.php?id=689
* - _IO_flush_all_linebuffered in Glibc
*/
static int fd_getc(int fd) {
unsigned char buffer[1];
if(read(fd, buffer, 1) < 0)
return EOF;
else
return buffer[0];
}
static char *fd_fgets(char buffer[], size_t bufsize, int fd) {
size_t index = 0;
int ch;
assert(bufsize > 0);
while(index + 1 < bufsize && (ch = fd_getc(fd)) >= 0) {
buffer[index++] = ch;
if(ch == '\n')
break;
}
buffer[index] = 0;
return ch < 0 ? NULL : buffer;
}
static void test(const char *typed, const char *typed2, bool expect) {
pthread_t tid;
char buffer[1024];
assert(pthread_create(&tid, NULL, background, NULL) == 0);
assert(fd_fgets(buffer, sizeof buffer, output));
assert(std::string(buffer) == "spong\n");
assert(fd_getc(output) == 'y');
assert(fd_getc(output) == 'e');
assert(fd_getc(output) == 's');
assert(fd_getc(output) == '/');
assert(fd_getc(output) == 'n');
assert(fd_getc(output) == 'o');
assert(fd_getc(output) == '>');
assert(fd_getc(output) == ' ');
assert(fprintf(input, "%s\n", typed) >= 0);
assert(fflush(input) >= 0);
if(typed2) {
assert(fd_fgets(buffer, sizeof buffer, output));
assert(std::string(buffer) == "Please answer 'yes' or 'no'.\n");
assert(fd_fgets(buffer, sizeof buffer, output));
assert(std::string(buffer) == "spong\n");
assert(fd_getc(output) == 'y');
assert(fd_getc(output) == 'e');
assert(fd_getc(output) == 's');
assert(fd_getc(output) == '/');
assert(fd_getc(output) == 'n');
assert(fd_getc(output) == 'o');
assert(fd_getc(output) == '>');
assert(fd_getc(output) == ' ');
assert(fprintf(input, "%s\n", typed2) >= 0);
assert(fflush(input) >= 0);
}
assert(pthread_join(tid, NULL) == 0);
assert(result == expect);
}
static void test_force(void) {
pthread_t tid;
command.force = true;
assert(pthread_create(&tid, NULL, background, NULL) == 0);
assert(pthread_join(tid, NULL) == 0);
assert(result == true);
command.force = false;
}
int main() {
int i[2], o[2];
assert(pipe(i) >= 0);
assert(pipe(o) >= 0);
assert(dup2(i[0], 0) >= 0);
assert(close(i[0]) >= 0);
assert(dup2(o[1], 1) >= 0);
assert(close(o[1]) >= 0);
assert((input = fdopen(i[1], "w")));
output = o[0];
test("yes", NULL, true);
test("no", NULL, false);
test("", "yes", true);
test("whatever", "yes", true);
test_force();
assert(fclose(input) >= 0);
try {
check("%s", "spong");
assert(!"unexpectedly succeeded");
} catch(IOError &e) {
}
return 0;
}
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