Use fmemopen to create a file descriptor (FILE) for data already in memory.

gistfile1.txt

Use fmemopen to create a file descriptor (FILE) for data already in memory.

see: http://www.kernel.org/doc/man-pages/online/pages/man3/fmemopen.3.html

for iOS/OSX version see: https://github.com/jverkoey/fmemopen

It's important to note that fmemopen(); doesn't provide a file descriptor but rather a file pointer. If fileno() is used in order to retrive the actual file descriptor, it will return -1, since there is no file descriptor at all.

char buffer[128] = { 'a' }
FILE * fp = fmemopen(buffer, sizoef(128), "r+");
int fd = fileno(fp);
printf ("File descriptor: %d\n", fd);

it will print -1.