Multiple conflicting errno.h libraries

Question

Working with nRF9160 in Zephyr, I've recently noticed that there are multiple conflicting definition of the errno.h values available, and I'm pretty sure I've seen both in use at various times. 
 Most of Zephyr appears to use the ones available in zephyr/lib/libc/minimal/include/errno.h 
 The NRFX library politely defines it's own variants with NRF_ prefixes in nrfxlib/bsdlib/include/nrf_errno.h 
 However, the gnuarmemb toolchain provides it's own version in gnuarmemb2018q2/arm-none-eabi/include/sys/errno.h which DON'T MATCH and I've seen evidence of some libraries using them, including the NRFX BSD library. 
 For example, ETIMEDOUT is 60 in the Zephyr's variants, but 116 in the gnuarmemb variant, and I just had a NRFX offloaded recv() call fail with errno=116. (Specifically in the download_client library) 
 This needs to be rectified...

Håkon Alseth · Accepted Answer

Hi, 
 
 I made a small routine to print your libc wrt. errno's: 
 #define ERRNO_STRINGIFY(ERR) \
do {printk("Errno %s has value %d
", #ERR, ERR);} \
while (0)

void errno_checker(void)
{
	#if defined(CONFIG_NEWLIB_LIBC) && defined(_NEWLIB_VERSION)
	printk("Newlib version %s
", _NEWLIB_VERSION);
	#elif defined(ZEPHYR_LIB_LIBC_MINIMAL_INCLUDE_ERRNO_H_)
	printk("Zephyr Minimal libc
");
	#else
	printk("Not able to resolve libc used
");
	#endif

 ERRNO_STRINGIFY(EPERM );
 ERRNO_STRINGIFY(ENOENT );
 ERRNO_STRINGIFY(ESRCH );
 ERRNO_STRINGIFY(EINTR );
 ERRNO_STRINGIFY(EIO );
 ERRNO_STRINGIFY(ENXIO );
 ERRNO_STRINGIFY(E2BIG );
 ERRNO_STRINGIFY(ENOEXEC );
 ERRNO_STRINGIFY(EBADF );
 ERRNO_STRINGIFY(ECHILD );
 ERRNO_STRINGIFY(EAGAIN );
 ERRNO_STRINGIFY(ENOMEM );
 ERRNO_STRINGIFY(EACCES );
 ERRNO_STRINGIFY(EFAULT );
 ERRNO_STRINGIFY(ENOTEMPTY );
 ERRNO_STRINGIFY(EBUSY );
 ERRNO_STRINGIFY(EEXIST );
 ERRNO_STRINGIFY(EXDEV );
 ERRNO_STRINGIFY(ENODEV );
 ERRNO_STRINGIFY(ENOTDIR );
 ERRNO_STRINGIFY(EISDIR );
 ERRNO_STRINGIFY(EINVAL );
 ERRNO_STRINGIFY(ENFILE );
 ERRNO_STRINGIFY(EMFILE );
 ERRNO_STRINGIFY(ENOTTY );
 ERRNO_STRINGIFY(ENAMETOOLONG );
 ERRNO_STRINGIFY(EFBIG );
 ERRNO_STRINGIFY(ENOSPC );
 ERRNO_STRINGIFY(ESPIPE );
 ERRNO_STRINGIFY(EROFS );
 ERRNO_STRINGIFY(EMLINK );
 ERRNO_STRINGIFY(EPIPE );
 ERRNO_STRINGIFY(EDEADLK );
 ERRNO_STRINGIFY(ENOLCK );
 ERRNO_STRINGIFY(ENOTSUP );
 ERRNO_STRINGIFY(EMSGSIZE );
 ERRNO_STRINGIFY(EDOM );
 ERRNO_STRINGIFY(ERANGE );
 ERRNO_STRINGIFY(EDESTADDRREQ );
 ERRNO_STRINGIFY(EPROTOTYPE );
 ERRNO_STRINGIFY(ENOPROTOOPT );
 ERRNO_STRINGIFY(EPROTONOSUPPORT);
 ERRNO_STRINGIFY(ESOCKTNOSUPPORT);
 ERRNO_STRINGIFY(EOPNOTSUPP );
 ERRNO_STRINGIFY(EPFNOSUPPORT );
 ERRNO_STRINGIFY(EAFNOSUPPORT );
 ERRNO_STRINGIFY(EADDRINUSE );
 ERRNO_STRINGIFY(EADDRNOTAVAIL );
 ERRNO_STRINGIFY(ENOTSOCK );
 ERRNO_STRINGIFY(ENETUNREACH );
 ERRNO_STRINGIFY(ENETRESET );
 ERRNO_STRINGIFY(ECONNABORTED );
 ERRNO_STRINGIFY(ECONNRESET );
 ERRNO_STRINGIFY(ENOBUFS );
 ERRNO_STRINGIFY(EISCONN );
 ERRNO_STRINGIFY(ENOTCONN );
 ERRNO_STRINGIFY(ESHUTDOWN );
 ERRNO_STRINGIFY(ETOOMANYREFS );
 ERRNO_STRINGIFY(ETIMEDOUT );
 ERRNO_STRINGIFY(ECONNREFUSED );
 ERRNO_STRINGIFY(ENETDOWN );
 ERRNO_STRINGIFY(ETXTBSY );
 ERRNO_STRINGIFY(ELOOP );
 ERRNO_STRINGIFY(EHOSTUNREACH );
 ERRNO_STRINGIFY(ENOTBLK );
 ERRNO_STRINGIFY(EHOSTDOWN );
 ERRNO_STRINGIFY(EINPROGRESS );
 ERRNO_STRINGIFY(EALREADY );
 ERRNO_STRINGIFY(EWOULDBLOCK );
 ERRNO_STRINGIFY(ENOSYS );
 ERRNO_STRINGIFY(ECANCELED );
/* Not defined in newlib
 ERRNO_STRINGIFY(ERRMAX );*/
 ERRNO_STRINGIFY(ENOSR );
 ERRNO_STRINGIFY(ENOSTR );
 ERRNO_STRINGIFY(EPROTO );
 ERRNO_STRINGIFY(EBADMSG );
 ERRNO_STRINGIFY(ENODATA );
 ERRNO_STRINGIFY(ETIME );
 ERRNO_STRINGIFY(ENOMSG );
 ERRNO_STRINGIFY(EILSEQ );	
} 
 Are you certain that this is related to the codebase? Newlib has different definitions of errno, compared to zephyrs minimal libc, and ETIMEDOUT is 116 in newlib v3.0.0: 
 Newlib version 3.0.0
Errno EPERM has value 1
Errno ENOENT has value 2
Errno ESRCH has value 3
Errno EINTR has value 4
Errno EIO has value 5
Errno ENXIO has value 6
Errno E2BIG has value 7
Errno ENOEXEC has value 8
Errno EBADF has value 9
Errno ECHILD has value 10
Errno EAGAIN has value 11
Errno ENOMEM has value 12
Errno EACCES has value 13
Errno EFAULT has value 14
Errno ENOTEMPTY has value 90
Errno EBUSY has value 16
Errno EEXIST has value 17
Errno EXDEV has value 18
Errno ENODEV has value 19
Errno ENOTDIR has value 20
Errno EISDIR has value 21
Errno EINVAL has value 22
Errno ENFILE has value 23
Errno EMFILE has value 24
Errno ENOTTY has value 25
Errno ENAMETOOLONG has value 91
Errno EFBIG has value 27
Errno ENOSPC has value 28
Errno ESPIPE has value 29
Errno EROFS has value 30
Errno EMLINK has value 31
Errno EPIPE has value 32
Errno EDEADLK has value 45
Errno ENOLCK has value 46
Errno ENOTSUP has value 134
Errno EMSGSIZE has value 122
Errno EDOM has value 33
Errno ERANGE has value 34
Errno EDESTADDRREQ has value 121
Errno EPROTOTYPE has value 107
Errno ENOPROTOOPT has value 109
Errno EPROTONOSUPPORT has value 123
Errno ESOCKTNOSUPPORT has value 124
Errno EOPNOTSUPP has value 95
Errno EPFNOSUPPORT has value 96
Errno EAFNOSUPPORT has value 106
Errno EADDRINUSE has value 112
Errno EADDRNOTAVAIL has value 125
Errno ENOTSOCK has value 108
Errno ENETUNREACH has value 114
Errno ENETRESET has value 126
Errno ECONNABORTED has value 113
Errno ECONNRESET has value 104
Errno ENOBUFS has value 105
Errno EISCONN has value 127
Errno ENOTCONN has value 128
Errno ESHUTDOWN has value 110
Errno ETOOMANYREFS has value 129
Errno ETIMEDOUT has value 116
Errno ECONNREFUSED has value 111
Errno ENETDOWN has value 115
Errno ETXTBSY has value 26
Errno ELOOP has value 92
Errno EHOSTUNREACH has value 118
Errno ENOTBLK has value 15
Errno EHOSTDOWN has value 117
Errno EINPROGRESS has value 119
Errno EALREADY has value 120
Errno EWOULDBLOCK has value 11
Errno ENOSYS has value 88
Errno ECANCELED has value 140
Errno ENOSR has value 63
Errno ENOSTR has value 60
Errno EPROTO has value 71
Errno EBADMSG has value 77
Errno ENODATA has value 61
Errno ETIME has value 62
Errno ENOMSG has value 35
Errno EILSEQ has value 138
 
 Which looks consistent with the errno in sys (this file is old, but seems to be unchanged compared to the sourceware git repo): 
 https://github.com/eblot/newlib/blob/master/newlib/libc/include/sys/errno.h#L147 
 
 Does your prj.conf/.config set "CONFIG_NEWLIB_LIBC=y"? 
 
 Kind regards, 
 Håkon

jbrzozoski · Answer

Håkon Alseth said: Does your prj.conf/.config set "CONFIG_NEWLIB_LIBC=y"? 
 Yep. I forgot we *just* added it for lwm2m_carrier, and that's probably why this looked out of place to me. The socket offload layer is probably converting from NRF_ETIMEDOUT to the newlib ETIMEDOUT just like it's supposed to.. 
 Thank you for the hint.

Multiple conflicting errno.h libraries

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