gcc编译和运行hadoop c api程序

cfsky

[hadoop@master HDFS_C_API]$ cat hdfs_cpp_demo.c　　
// Following is a libhdfs sample adapted from the src/c++/libhdfs/hdfs_write.c of the Hadoop distribution.
　　
#include "hdfs.h"
　　
int main(int argc, char **argv) {
　　hdfsFS fs = hdfsConnect("master",9000);
　　if (!fs) {
　　fprintf(stderr, "Cannot connect to HDFS.\n");
　　exit(-1);
　　}
　　char* fileName = "demo_c.txt";
　　char* message = "Welcome to HDFS C API!!!";

　　int>　　int exists = hdfsExists(fs, fileName);
　　if (exists > -1) {
　　fprintf(stdout, "File %s exists!\n", fileName);
　　}else{
　　// Create and open file for writing
　　hdfsFile outFile = hdfsOpenFile(fs, fileName, O_WRONLY|O_CREAT, 0, 0, 0);
　　if (!outFile) {
　　fprintf(stderr, "Failed to open %s for writing!\n", fileName);
　　exit(-2);
　　}
　　// write to file

　　hdfsWrite(fs, outFile, (void*)message,>　　hdfsCloseFile(fs, outFile);
　　}
　　// Open file for reading
　　hdfsFile inFile = hdfsOpenFile(fs, fileName, O_RDONLY, 0, 0, 0);
　　if (!inFile) {
　　fprintf(stderr, "Failed to open %s for reading!\n", fileName);
　　exit(-2);
　　}

　　char* data = malloc(sizeof(char) *>　　// Read from file.

　　tSize readSize = hdfsRead(fs, inFile, (void*)data,>　　fprintf(stdout, "%s\n", data);
　　free(data);
　　hdfsCloseFile(fs, inFile);
　　hdfsDisconnect(fs);
　　return 0;
　　
}