--- /dev/null
+#include <ccan/pipecmd/pipecmd.h>
+/* Include the C files directly. */
+#include <ccan/pipecmd/pipecmd.c>
+#include <ccan/tap/tap.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main(int argc, char *argv[])
+{
+ pid_t child;
+ int infd, outfd, status;
+ char buf[5] = "test";
+
+ /* We call ourselves, to test pipe. */
+ if (argc == 2) {
+ if (strcmp(argv[1], "out") == 0) {
+ if (write(STDOUT_FILENO, buf, sizeof(buf)) != sizeof(buf))
+ exit(1);
+ } else if (strcmp(argv[1], "in") == 0) {
+ if (read(STDIN_FILENO, buf, sizeof(buf)) != sizeof(buf))
+ exit(1);
+ if (memcmp(buf, "test", sizeof(buf)) != 0)
+ exit(1);
+ } else if (strcmp(argv[1], "inout") == 0) {
+ if (read(STDIN_FILENO, buf, sizeof(buf)) != sizeof(buf))
+ exit(1);
+ buf[0]++;
+ if (write(STDOUT_FILENO, buf, sizeof(buf)) != sizeof(buf))
+ exit(1);
+ } else
+ abort();
+ exit(0);
+ }
+
+ /* This is how many tests you plan to run */
+ plan_tests(26);
+ child = pipecmd(&outfd, &infd, argv[0], "inout", NULL);
+ if (!ok1(child > 0))
+ exit(1);
+ ok1(write(infd, buf, sizeof(buf)) == sizeof(buf));
+ ok1(read(outfd, buf, sizeof(buf)) == sizeof(buf));
+ buf[0]--;
+ ok1(memcmp(buf, "test", sizeof(buf)) == 0);
+ ok1(waitpid(child, &status, 0) == child);
+ ok1(WIFEXITED(status));
+ ok1(WEXITSTATUS(status) == 0);
+
+ child = pipecmd(NULL, &infd, argv[0], "in", NULL);
+ if (!ok1(child > 0))
+ exit(1);
+ ok1(write(infd, buf, sizeof(buf)) == sizeof(buf));
+ ok1(waitpid(child, &status, 0) == child);
+ ok1(WIFEXITED(status));
+ ok1(WEXITSTATUS(status) == 0);
+
+ child = pipecmd(&outfd, NULL, argv[0], "out", NULL);
+ if (!ok1(child > 0))
+ exit(1);
+ ok1(read(outfd, buf, sizeof(buf)) == sizeof(buf));
+ ok1(memcmp(buf, "test", sizeof(buf)) == 0);
+ ok1(waitpid(child, &status, 0) == child);
+ ok1(WIFEXITED(status));
+ ok1(WEXITSTATUS(status) == 0);
+
+ // Writing to /dev/null should be fine.
+ child = pipecmd(NULL, NULL, argv[0], "out", NULL);
+ if (!ok1(child > 0))
+ exit(1);
+ ok1(waitpid(child, &status, 0) == child);
+ ok1(WIFEXITED(status));
+ ok1(WEXITSTATUS(status) == 0);
+
+ // Reading should fail.
+ child = pipecmd(NULL, NULL, argv[0], "in", NULL);
+ if (!ok1(child > 0))
+ exit(1);
+ ok1(waitpid(child, &status, 0) == child);
+ ok1(WIFEXITED(status));
+ ok1(WEXITSTATUS(status) == 1);
+
+ /* This exits depending on whether all tests passed */
+ return exit_status();
+}