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R3704/2.3.0/hadoop-2.3.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/native/util/posix_util.c
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posix_util.c
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "util/posix_util.h"
#include <dirent.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
static pthread_mutex_t gTempdirLock = PTHREAD_MUTEX_INITIALIZER;
static int gTempdirNonce = 0;
int recursiveDeleteContents(const char *path)
{
int ret;
DIR *dp;
struct dirent *de;
char tmp[PATH_MAX];
dp = opendir(path);
if (!dp) {
ret = -errno;
fprintf(stderr, "recursiveDelete(%s) failed with error %d\n", path, ret);
return ret;
}
while (1) {
de = readdir(dp);
if (!de) {
ret = 0;
break;
}
if ((de->d_name[0] == '.') && (de->d_name[1] == '\0'))
continue;
if ((de->d_name[0] == '.') && (de->d_name[1] == '.') &&
(de->d_name[2] == '\0'))
continue;
snprintf(tmp, sizeof(tmp), "%s/%s", path, de->d_name);
ret = recursiveDelete(tmp);
if (ret)
break;
}
if (closedir(dp)) {
ret = -errno;
fprintf(stderr, "recursiveDelete(%s): closedir failed with "
"error %d\n", path, ret);
return ret;
}
return ret;
}
/*
* Simple recursive delete implementation.
* It could be optimized, but there is no need at the moment.
* TODO: use fstat, etc.
*/
int recursiveDelete(const char *path)
{
int ret;
struct stat stBuf;
ret = stat(path, &stBuf);
if (ret != 0) {
ret = -errno;
fprintf(stderr, "recursiveDelete(%s): stat failed with "
"error %d\n", path, ret);
return ret;
}
if (S_ISDIR(stBuf.st_mode)) {
ret = recursiveDeleteContents(path);
if (ret)
return ret;
ret = rmdir(path);
if (ret) {
ret = errno;
fprintf(stderr, "recursiveDelete(%s): rmdir failed with error %d\n",
path, ret);
return ret;
}
} else {
ret = unlink(path);
if (ret) {
ret = -errno;
fprintf(stderr, "recursiveDelete(%s): unlink failed with "
"error %d\n", path, ret);
return ret;
}
}
return 0;
}
int createTempDir(char *tempDir, int nameMax, int mode)
{
char tmp[PATH_MAX];
int pid, nonce;
const char *base = getenv("TMPDIR");
if (!base)
base = "/tmp";
if (base[0] != '/') {
// canonicalize non-absolute TMPDIR
if (realpath(base, tmp) == NULL) {
return -errno;
}
base = tmp;
}
pid = getpid();
pthread_mutex_lock(&gTempdirLock);
nonce = gTempdirNonce++;
pthread_mutex_unlock(&gTempdirLock);
snprintf(tempDir, nameMax, "%s/temp.%08d.%08d", base, pid, nonce);
if (mkdir(tempDir, mode) == -1) {
int ret = errno;
return -ret;
}
return 0;
}
void sleepNoSig(int sec)
{
int ret;
struct timespec req, rem;
rem.tv_sec = sec;
rem.tv_nsec = 0;
do {
req = rem;
ret = nanosleep(&req, &rem);
} while ((ret == -1) && (errno == EINTR));
if (ret == -1) {
ret = errno;
fprintf(stderr, "nanosleep error %d (%s)\n", ret, strerror(ret));
}
}
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