30 lines
842 B
C
30 lines
842 B
C
#include <errno.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include <jni.h>
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#include <android/log.h>
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const char* LOG_TAG = "MemFile";
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void log_err(const char* function) {
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__android_log_print(ANDROID_LOG_ERROR, LOG_TAG, "%s(): %s", function, strerror(errno));
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}
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JNIEXPORT jint JNICALL
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Java_sushi_hardcore_droidfs_MemFile_00024Companion_createMemFile(JNIEnv *env, jobject thiz, jstring jname,
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jlong size) {
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const char* name = (*env)->GetStringUTFChars(env, jname, NULL);
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int fd = syscall(SYS_memfd_create, name, MFD_CLOEXEC);
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if (fd < 0) {
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log_err("memfd_create");
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return fd;
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}
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if (ftruncate64(fd, size) == -1) {
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log_err("ftruncate64");
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close(fd);
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return -1;
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}
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return fd;
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} |