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Reference: errno Values

[FreeRTOS+FAT Standard API Reference]

File related functions in the standard C library often return 0 for pass, and -1 for fail. If -1 is returned then the reason for the failure is stored in a variable called errno, which must be inspected separately.

FreeRTOS+FAT’s standard stdio style interface maintains an errno variable for each RTOS task. A task can retrieve its errno value by calling ff_errno(). The values returned by ff_errno() are defined below.

Notes:

  • The file system’s C library style API uses the same errno values as used by the stanard C library. These are documented on a separate page.

  • The file system’s native API has a more sophisticated error code system, and returns error codes directly from its API functions.

Value
Constant
Description
0 pdFREERTOS_ERRNO_NONE No such file or directory
2 pdFREERTOS_ERRNO_ENOENT No such file or directory
5 pdFREERTOS_ERRNO_EIO I/O error
6 pdFREERTOS_ERRNO_ENXIO No such device or address
9 pdFREERTOS_ERRNO_EBADF Bad file number
11 pdFREERTOS_ERRNO_EAGAIN No more processes
11 pdFREERTOS_ERRNO_EWOULDBLOCK Operation would block
12 pdFREERTOS_ERRNO_ENOMEM Not enough core
13 pdFREERTOS_ERRNO_EACCES Permission denied
14 pdFREERTOS_ERRNO_EFAULT Bad address
16 pdFREERTOS_ERRNO_EBUSY Mount device busy
17 pdFREERTOS_ERRNO_EEXIST File exists
18 pdFREERTOS_ERRNO_EXDEV Cross-device link
19 pdFREERTOS_ERRNO_ENODEV No such device
20 pdFREERTOS_ERRNO_ENOTDIR Not a directory
21 pdFREERTOS_ERRNO_EISDIR Is a directory
22 pdFREERTOS_ERRNO_EINVAL Invalid argument
28 pdFREERTOS_ERRNO_ENOSPC No space left on device
29 pdFREERTOS_ERRNO_ESPIPE Illegal seek
30 pdFREERTOS_ERRNO_EROFS Read only file system
42 pdFREERTOS_ERRNO_EUNATCH Protocol driver not attached
50 pdFREERTOS_ERRNO_EBADE Invalid exchange
79 pdFREERTOS_ERRNO_EFTYPE Inappropriate file type or format
89 pdFREERTOS_ERRNO_ENMFILE No more files
90 pdFREERTOS_ERRNO_ENOTEMPTY Directory not empty
91 pdFREERTOS_ERRNO_ENAMETOOLONG File or path name too long
95 pdFREERTOS_ERRNO_EOPNOTSUPP Operation not supported on transport endpoint
105 pdFREERTOS_ERRNO_ENOBUFS No buffer space available
109 pdFREERTOS_ERRNO_ENOPROTOOPT Protocol not available
112 pdFREERTOS_ERRNO_EADDRINUSE Address already in use
116 pdFREERTOS_ERRNO_ETIMEDOUT Connection timed out
119 pdFREERTOS_ERRNO_EINPROGRESS Connection already in progress
120 pdFREERTOS_ERRNO_EALREADY Socket already connected
125 pdFREERTOS_ERRNO_EADDRNOTAVAIL Address not available
127 pdFREERTOS_ERRNO_EISCONN Socket is already connected
128 pdFREERTOS_ERRNO_ENOTCONN Socket is not connected
135 pdFREERTOS_ERRNO_ENOMEDIUM No medium inserted
138 pdFREERTOS_ERRNO_EILSEQ An invalid UTF-16 sequence was encountered
140 pdFREERTOS_ERRNO_ECANCELED Operation cancelled


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