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8229872: (fs) Increase buffer size used with getmntent

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Dynamically allocate memory for getmntent

Reviewed-by: alanb
This commit is contained in:
Vladimir Kempik 2019-09-24 14:54:57 +03:00
parent 628283fe53
commit 67ad501e5b
5 changed files with 89 additions and 9 deletions
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10
src/java.base/unix/classes/sun/nio/fs/UnixNativeDispatcher.java
View file

@ -118,6 +118,16 @@ class UnixNativeDispatcher {
*/
static native void fclose(long stream) throws UnixException;
/**
* void rewind(FILE* stream);
*/
static native void rewind(long stream) throws UnixException;
/**
* ssize_t getline(char **lineptr, size_t *n, FILE *stream);
*/
static native int getlinelen(long stream) throws UnixException;
/**
* link(const char* existing, const char* new)
*/

45
src/java.base/unix/native/libnio/fs/UnixNativeDispatcher.c
View file

@ -403,6 +403,51 @@ Java_sun_nio_fs_UnixNativeDispatcher_fclose(JNIEnv* env, jclass this, jlong stre
}
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_UnixNativeDispatcher_rewind(JNIEnv* env, jclass this, jlong stream)
{
FILE* fp = jlong_to_ptr(stream);
int saved_errno;
errno = 0;
rewind(fp);
saved_errno = errno;
if (ferror(fp)) {
throwUnixException(env, saved_errno);
}
}
/**
* This function returns line length without NUL terminator or -1 on EOF.
*/
JNIEXPORT jint JNICALL
Java_sun_nio_fs_UnixNativeDispatcher_getlinelen(JNIEnv* env, jclass this, jlong stream)
{
FILE* fp = jlong_to_ptr(stream);
size_t lineSize = 0;
char * lineBuffer = NULL;
int saved_errno;
ssize_t res = getline(&lineBuffer, &lineSize, fp);
saved_errno = errno;
/* Should free lineBuffer no matter result, according to man page */
if (lineBuffer != NULL)
free(lineBuffer);
if (feof(fp))
return -1;
/* On successfull return res >= 0, otherwise res is -1 */
if (res == -1)
throwUnixException(env, saved_errno);
if (res > INT_MAX)
throwUnixException(env, EOVERFLOW);
return (jint)res;
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_UnixNativeDispatcher_open0(JNIEnv* env, jclass this,
jlong pathAddress, jint oflags, jint mode)