glfsxmp: libgfapi based example

This is an example application which uses libgfapi. It is
a complete autotools based build system which demonstrates the
required changes in configure.ac, Makefile.am etc to successfuly
detect for and build an application against libgfapi.

There are two approaches to building a libgfapi based application:

1. In the presence of pkg-config in your build system.
This is the recommended approach which is also used in this example.
For this approach to work, you need to build glusterfs by passing
--pkgconfigdir=/usr/lib64/pkgconfig (or the appropriate directory)
in your distro. This already happens if you build RPMs with the
glusterfs.spec provided in glusterfs.git. You will also need to
install glusterfs-api RPM.

2. In the absence of pkg-config in your build system.
Make sure your LDFLAGS includes -L/path/to/lib where libgfapi.so is
installed and -I/path/to/include/glusterfs where the 'api' directory

Change-Id: Ic4eab2df002d7e8d20593a03e643859423048848
BUG: 839950
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.com/3666
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>

5 files changed, 97 insertions, 0 deletions

diff --git a/api/examples/Makefile.am b/api/examples/Makefile.am
new file mode 100644
index 00000000..6048bb1c
--- /dev/null
+++ b/api/examples/Makefile.am
@@ -0,0 +1,4 @@
+noinst_PROGRAMS = glfsxmp
+glfsxmp_SOURCES = glfsxmp.c
+glfsxmp_CFLAGS = $(GLFS_CFLAGS) -Wall
+glfsxmp_LDADD = $(GLFS_LIBS)
\ No newline at end of file
diff --git a/api/examples/README b/api/examples/README
new file mode 100644
index 00000000..8f0bab69
--- /dev/null
+++ b/api/examples/README
@@ -0,0 +1,19 @@
+This is an example application which uses libgfapi. It is
+a complete autotools based build system which demonstrates the
+required changes in configure.ac, Makefile.am etc to successfuly
+detect for and build an application against libgfapi.
+
+There are two approaches to building a libgfapi based application:
+
+1. In the presence of pkg-config in your build system.
+This is the recommended approach which is also used in this example.
+For this approach to work, you need to build glusterfs by passing
+--pkgconfigdir=/usr/lib64/pkgconfig (or the appropriate directory)
+in your distro. This already happens if you build RPMs with the
+glusterfs.spec provided in glusterfs.git. You will also need to
+install glusterfs-api RPM.
+
+2. In the absence of pkg-config in your build system.
+Make sure your LDFLAGS includes -L/path/to/lib where libgfapi.so is
+installed and -I/path/to/include/glusterfs where the 'api' directory
+containing the headers are available.
diff --git a/api/examples/autogen.sh b/api/examples/autogen.sh
new file mode 100755
index 00000000..1fee6be1
--- /dev/null
+++ b/api/examples/autogen.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+aclocal
+autoconf
+automake --foreign
diff --git a/api/examples/configure.ac b/api/examples/configure.ac
new file mode 100644
index 00000000..b80177a4
--- /dev/null
+++ b/api/examples/configure.ac
@@ -0,0 +1,12 @@
+
+AC_INIT([glfs-test],[0.1],[gluster-devel@nongu.org])
+
+AM_INIT_AUTOMAKE
+
+AC_CONFIG_FILES([Makefile])
+
+AC_PROG_CC
+
+PKG_CHECK_MODULES([GLFS], [glusterfs-api >= 3])
+
+AC_OUTPUT
diff --git a/api/examples/glfsxmp.c b/api/examples/glfsxmp.c
new file mode 100644
index 00000000..1883b54b
--- /dev/null
+++ b/api/examples/glfsxmp.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <errno.h>
+#include "api/glfs.h"
+#include <string.h>
+#include <time.h>
+
+int
+main (int argc, char *argv[])
+{
+	glfs_t    *fs = NULL;
+	int        ret = 0;
+	glfs_fd_t *fd = NULL;
+	struct stat sb = {0, };
+	char       readbuf[32];
+	char       writebuf[32];
+
+	char      *volname = "iops";
+	char      *filename = "/filename2";
+
+	fs = glfs_new (volname);
+	if (!fs) {
+		fprintf (stderr, "glfs_new: returned NULL\n");
+		return 1;
+	}
+
+//	ret = glfs_set_volfile (fs, "/tmp/filename.vol");
+
+	ret = glfs_set_volfile_server (fs, "socket", "localhost", 24007);
+
+//	ret = glfs_set_volfile_server (fs, "unix", "/tmp/gluster.sock", 0);
+
+	ret = glfs_set_logging (fs, "/dev/stderr", 7);
+
+	ret = glfs_init (fs);
+
+	fprintf (stderr, "glfs_init: returned %d\n", ret);
+
+
+	ret = glfs_lstat (fs, filename, &sb);
+	fprintf (stderr, "%s: (%d) %s\n", filename, ret, strerror (errno));
+
+	fd = glfs_creat (fs, filename, O_RDWR, 0644);
+	fprintf (stderr, "%s: (%p) %s\n", filename, fd, strerror (errno));
+
+	sprintf (writebuf, "hi there\n");
+	ret = glfs_write (fd, writebuf, 32, 0);
+
+	glfs_lseek (fd, 0, SEEK_SET);
+
+	ret = glfs_read (fd, readbuf, 32, 0);
+
+	printf ("read %d, %s", ret, readbuf);
+
+	glfs_close (fd);
+
+	return ret;
+}