First import

git-svn-id: http://photonzero.com/dotfiles/trunk@1 23f722f6-122a-0410-8cef-c75bd312dd78

bin/build/src/wye/wye.c

@@ -0,0 +1,72 @@
+/* wye.c, written by Michael Constant (mconst@csua.berkeley.edu) and placed
+ * in the public domain.  $Id: wye.c,v 1.1 1999-05-03 10:04:59-07 mconst $ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+
+#define TEMPMASK "/tmp/wye.XXXXXX"	/* the name of our tempfile */
+#define TIMEOUT 3600			/* time we wait for the fifo to open */
+
+void cleanup(int sig);
+
+char tempfile[]=TEMPMASK;
+
+int main()
+{
+	int ch;
+	FILE *fp;
+
+	/* create the fifo.  if we get EEXIST, then someone else created a
+	 * file with our intended name right before we did; we should pick
+	 * a new name and try again.  see the source to mkstemp(3). */
+	while (mkfifo(mktemp(tempfile), 0600) == -1) {
+		if (errno != EEXIST) {
+			perror("wye: couldn't create fifo");
+			exit(1);
+		}
+		strcpy(tempfile, TEMPMASK);
+	}
+
+	/* remove our tempfile if we die */
+	signal(SIGHUP, cleanup);
+	signal(SIGINT, cleanup);
+	signal(SIGTERM, cleanup);
+	signal(SIGALRM, cleanup);
+
+	/* fork a child to do the work */
+	switch (fork()) {
+	case -1:
+		perror("wye: couldn't fork");
+		exit(1);
+
+	case 0:
+		fclose(stdout);		/* this is necessary for `cmd | wye` */
+		alarm(TIMEOUT);		/* this is if the fifo never opens */
+
+		/* this will block until someone else opens the fifo */
+		if ((fp = fopen(tempfile, "w")) == NULL) {
+			perror("wye: couldn't open fifo");
+			exit(1);	/* not as if anyone cares */
+		}
+
+		alarm(0);		/* cancel the alarm */
+		unlink(tempfile);	/* so it disappears when we're done */
+		while ((ch = getchar()) != EOF) putc(ch, fp);
+		exit(0);
+	}
+
+	/* output the name of the fifo */
+	printf("%s\n", tempfile);
+	exit(0);
+}
+
+void cleanup(int sig)
+{
+	unlink(tempfile);
+	exit(2);
+}