minimum libhdfs example

hello.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hdfs.h"

int main(int argc, char **argv) {

  // hdfsFS fs = hdfsConnect("default", 0);
  hdfsFS fs = hdfsConnect("192.168.1.81", 8020);
  const char* writePath = "/tmp/testfile.txt";
  hdfsFile writeFile = hdfsOpenFile(fs, writePath, O_WRONLY|O_CREAT, 0, 0, 0);
  if(!writeFile) {
    fprintf(stderr, "Failed to open %s for writing!\n", writePath);
    exit(-1);
  }
  char* buffer = "Hello, World!";
  tSize num_written_bytes = hdfsWrite(fs, writeFile, (void*)buffer, strlen(buffer)+1);
  if (hdfsFlush(fs, writeFile)) {
    fprintf(stderr, "Failed to 'flush' %s\n", writePath); 
    exit(-1);
  }
  hdfsCloseFile(fs, writeFile);

  return 0;
}

Makefile

CC=gcc

JVM_ROOT=/usr/lib/jvm/java-7-openjdk-amd64/
HADOOP_ROOT=/home/xiaolin/work/apache/hadoop-2.7.1
export CLASSPATH=$(shell ${HADOOP_ROOT}/bin/hadoop classpath --glob)
export LD_LIBRARY_PATH=${HADOOP_ROOT}/lib/native:${JVM_ROOT}/jre/lib/amd64/server/

CFLAGS = -O2 -g -Wall -fmessage-length=0 -I${HADOOP_ROOT}/include
OBJS = hello.o
LIBS = -L${HADOOP_ROOT}/lib/native -lhdfs -Wl,-rpath, -Wl,${JVM_ROOT}/jre/lib/amd64/server/libjvm.so
TARGET =	hello

all:	$(TARGET)

$(OBJS): %.o:%.c
	$(CC) $(CFLAGS) -c $< -o $@

$(TARGET): $(OBJS)
	$(CC) -o $(TARGET) $(OBJS) $(LIBS)

run:$(TARGET)
	./hello

clean:
	rm -f $(OBJS) $(TARGET)