A tool to run multiple tests concurrently, or without a terminal.

Merely redirecting stdout to /dev/null is not enough: Crawl and ncurses
insist to be able to ioctl the terminal, check the window size, try to read
from stdin and fail if it's in eof state, etc.  Eliminating all such
references would be quite a bit of work (ncurses assumes stdin/stdout are
always a terminal even if newterm() is used), and would be probably too
intrusive to be a faithful test.

Because of no autoconf, the pty code is not very portable, but should work
on Linux and BSD (hopefully including MacOS X).  For a portable
implementation, one could use http://angband.pl/svn/kbtin/trunk/run.c (+
autoconfage), but then, probably running on IRIX, pre-Solaris SunOS, HP UX
or SCO isn't that important... and there are no real ptys on Windows.

1 files changed, 84 insertions, 0 deletions

diff --git a/crawl-ref/source/util/fake_pty.c b/crawl-ref/source/util/fake_pty.c
new file mode 100644
index 0000000000..fbf0aaa999
--- /dev/null
+++ b/crawl-ref/source/util/fake_pty.c
@@ -0,0 +1,84 @@
+#include <pty.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <poll.h>
+#include <signal.h>
+#include <string.h>
+#include <errno.h>
+
+static pid_t crawl;
+static int tty;
+
+static void sigalrm(int signum)
+{
+    kill(crawl, SIGTERM);
+}
+
+static void slurp_output()
+{
+    struct pollfd pfd;
+    char buf[1024];
+
+    signal(SIGALRM, sigalrm);
+    alarm(3600); // a hard limit of an hour (big tests on a Raspberry...)
+
+    pfd.fd     = crawl;
+    pfd.events = POLLIN;
+
+    while (poll(&pfd, 1, 60000) > 0) // 60 seconds with no output -> kesim
+    {
+        if (read(tty, buf, sizeof(buf)) <= 0)
+            break;
+    }
+
+    kill(crawl, SIGTERM); // shooting a zombie is ok, let's make sure it's dead
+}
+
+int main(int argc, char * const *argv)
+{
+    struct winsize ws;
+    int slave;
+    int ret;
+
+    if (argc <= 1)
+    {
+        fprintf(stderr, "Usage: fake_pty program [args]\n");
+        return 1;
+    }
+
+    ws.ws_row = 24;
+    ws.ws_col = 80;
+    ws.ws_xpixel = ws.ws_ypixel = 0;
+
+    // We want to let stderr through, thus can't use forkpty().
+    if (openpty(&tty, &slave, 0, 0, &ws))
+    {
+        fprintf(stderr, "Can't create a pty: %s\n", strerror(errno));
+        return 1;
+    }
+
+    switch (crawl = fork())
+    {
+    case -1:
+        fprintf(stderr, "Can't fork: %s\n", strerror(errno));
+        return 1;
+
+    case 0:
+        close(tty);
+        dup2(slave, 0);
+        dup2(slave, 1); // but _not_ stderr!
+        close(slave);
+        execvp(argv[1], argv + 1);
+        fprintf(stderr, "Can't run '%s': %s\n", argv[1], strerror(errno));
+        return 1;
+
+    default:
+        close(slave);
+        slurp_output();
+        if (waitpid(crawl, &ret, 0) != crawl)
+            ret = 1; // can't happen
+        return ret;
+    }
+}