46 lines
1020 B
C++
46 lines
1020 B
C++
#include "org_thoughtcrime_securesms_util_FileUtils.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <linux/memfd.h>
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#include <syscall.h>
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jint JNICALL Java_org_thoughtcrime_securesms_util_FileUtils_getFileDescriptorOwner
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(JNIEnv *env, jclass clazz, jobject fileDescriptor)
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{
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jclass fdClass = env->GetObjectClass(fileDescriptor);
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if (fdClass == NULL) {
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return -1;
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}
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jfieldID fdFieldId = env->GetFieldID(fdClass, "descriptor", "I");
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if (fdFieldId == NULL) {
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return -1;
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}
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int fd = env->GetIntField(fileDescriptor, fdFieldId);
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struct stat stat_struct;
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if (fstat(fd, &stat_struct) != 0) {
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return -1;
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}
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return stat_struct.st_uid;
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}
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JNIEXPORT jint JNICALL Java_org_thoughtcrime_securesms_util_FileUtils_createMemoryFileDescriptor
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(JNIEnv *env, jclass clazz, jstring jname)
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{
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const char *name = env->GetStringUTFChars(jname, NULL);
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int fd = syscall(SYS_memfd_create, name, MFD_CLOEXEC);
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env->ReleaseStringUTFChars(jname, name);
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return fd;
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}
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