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authorKeith Packard <keithp@keithp.com>2012-10-05 11:59:35 -0700
committerKeith Packard <keithp@keithp.com>2012-10-05 11:59:35 -0700
commitf05b97d3856bc37272be9f0b58ea0abbaac9a33e (patch)
treef121f26f245b44063026365287a72ecefc12437c
parentf24210f9735851f0184a861dec9f435db969fb13 (diff)
Add simple multi-write example
Signed-off-by: Keith Packard <keithp@keithp.com>
-rw-r--r--Makefile10
-rw-r--r--twowrites.c77
2 files changed, 85 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 81ea87d..e5ee716 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,12 @@
CFLAGS=-O0 -g
-all: fdpassing
+all: fdpassing twowrites xreq
fdpassing: fdpassing.o fdpass.o
- $(CC) -o $@ fdpassing.o fdpass.o
+ $(CC) $(CFLAGS) -o $@ fdpassing.o fdpass.o
+
+twowrites: twowrites.o fdpass.o
+ $(CC) $(CFLAGS) -o $@ twowrites.o fdpass.o
+
+xreq: xreq.o fdpass.o
+ $(CC) $(CFLAGS) -o $@ xreq.o fdpass.o
diff --git a/twowrites.c b/twowrites.c
new file mode 100644
index 0000000..0529655
--- /dev/null
+++ b/twowrites.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "fdpass.h"
+
+void
+child(int sock)
+{
+ int fd;
+ char buf[16];
+ ssize_t size;
+
+ for (;;) {
+ size = sock_fd_read(sock, buf, sizeof(buf), &fd);
+ if (size <= 0)
+ break;
+ printf ("read %d\n", size);
+ if (fd != -1) {
+ write(fd, "hello, world\n", 13);
+ close(fd);
+ }
+ }
+}
+
+void
+parent(int sock)
+{
+ ssize_t size;
+ int i;
+ int fd;
+
+ fd = 1;
+ size = sock_fd_write(sock, "1", 1, -1);
+ printf ("wrote %d without fd\n", size);
+ size = sock_fd_write(sock, "1", 1, 1);
+ printf ("wrote %d with fd\n", size);
+}
+
+int
+main(int argc, char **argv)
+{
+ int sv[2];
+ int pid;
+
+ if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv) < 0) {
+ perror("socketpair");
+ exit(1);
+ }
+ switch ((pid = fork())) {
+ case 0:
+ close(sv[0]);
+ child(sv[1]);
+ break;
+ case -1:
+ perror("fork");
+ exit(1);
+ default:
+ close(sv[1]);
+ parent(sv[0]);
+ break;
+ }
+ return 0;
+}