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Use Files in 8M Nano

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I am using the 8m nano development kit.
I want to use files, but the open function gives me the error:

warning: implicit declaration of function 'open'; did you mean ‘popen’? [-Wimplicit-function-declaration]
43 | fd_Serial = open (MODEMDEVICE, O_RDWR | O_NOCTTY);
also with the types O_RDWR | O_NOCTTY.

In my main.c I have included
#include <sys / types.h>
#include <fcntl.h>.

When I try to search the module with the find command, it returns the following error:
root @ ccimx8mn-dvk: / usr # find / -type f -name "types.h"
[1152.265429] EXT4-fs error (device mmcblk0p3): htree_dirblock_to_tree: 997: inode # 10378: comm find: Directory block failed checksum
asked Sep 15, 2020 in Linux by lalvarez New to the Community (1 point)

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1 Answer

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I have solved the problem with the open function.
But the error when I do a find on the module, I would like to know what it is.
answered Sep 15, 2020 by lalvarez New to the Community (1 point)