tmpTest.cpp

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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
 
 
int main(int argc, const char *argv[]) {
    auto fd = open(argv[1], O_TMPFILE | O_WRONLY, 0777);
    write(fd, argv[1], strlen(argv[1]));
    write(fd, argv[2], strlen(argv[2]));
    char path[1024];
    snprintf(path, 1024,  "/proc/self/fd/%d", fd);
    linkat(df, "", AT_FDCWD, argv[2], AT_EMPTY_PATH);
    close(fd);
}