linux/lib/errname.c
Kent Overstreet 21db931445 lib: Export errname
errname() returns the name of an errcode; this functionality is
otherwise only available for error pointers via %pE - bcachefs uses this
for better error messages.

Signed-off-by: Christopher James Halse Rogers <raof@ubuntu.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2023-09-11 23:59:47 -04:00

232 lines
3.9 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/build_bug.h>
#include <linux/errno.h>
#include <linux/errname.h>
#include <linux/kernel.h>
#include <linux/math.h>
/*
* Ensure these tables do not accidentally become gigantic if some
* huge errno makes it in. On most architectures, the first table will
* only have about 140 entries, but mips and parisc have more sparsely
* allocated errnos (with EHWPOISON = 257 on parisc, and EDQUOT = 1133
* on mips), so this wastes a bit of space on those - though we
* special case the EDQUOT case.
*/
#define E(err) [err + BUILD_BUG_ON_ZERO(err <= 0 || err > 300)] = "-" #err
static const char *names_0[] = {
E(E2BIG),
E(EACCES),
E(EADDRINUSE),
E(EADDRNOTAVAIL),
E(EADV),
E(EAFNOSUPPORT),
E(EAGAIN), /* EWOULDBLOCK */
E(EALREADY),
E(EBADE),
E(EBADF),
E(EBADFD),
E(EBADMSG),
E(EBADR),
E(EBADRQC),
E(EBADSLT),
E(EBFONT),
E(EBUSY),
E(ECANCELED), /* ECANCELLED */
E(ECHILD),
E(ECHRNG),
E(ECOMM),
E(ECONNABORTED),
E(ECONNREFUSED), /* EREFUSED */
E(ECONNRESET),
E(EDEADLK), /* EDEADLOCK */
#if EDEADLK != EDEADLOCK /* mips, sparc, powerpc */
E(EDEADLOCK),
#endif
E(EDESTADDRREQ),
E(EDOM),
E(EDOTDOT),
#ifndef CONFIG_MIPS
E(EDQUOT),
#endif
E(EEXIST),
E(EFAULT),
E(EFBIG),
E(EHOSTDOWN),
E(EHOSTUNREACH),
E(EHWPOISON),
E(EIDRM),
E(EILSEQ),
#ifdef EINIT
E(EINIT),
#endif
E(EINPROGRESS),
E(EINTR),
E(EINVAL),
E(EIO),
E(EISCONN),
E(EISDIR),
E(EISNAM),
E(EKEYEXPIRED),
E(EKEYREJECTED),
E(EKEYREVOKED),
E(EL2HLT),
E(EL2NSYNC),
E(EL3HLT),
E(EL3RST),
E(ELIBACC),
E(ELIBBAD),
E(ELIBEXEC),
E(ELIBMAX),
E(ELIBSCN),
E(ELNRNG),
E(ELOOP),
E(EMEDIUMTYPE),
E(EMFILE),
E(EMLINK),
E(EMSGSIZE),
E(EMULTIHOP),
E(ENAMETOOLONG),
E(ENAVAIL),
E(ENETDOWN),
E(ENETRESET),
E(ENETUNREACH),
E(ENFILE),
E(ENOANO),
E(ENOBUFS),
E(ENOCSI),
E(ENODATA),
E(ENODEV),
E(ENOENT),
E(ENOEXEC),
E(ENOKEY),
E(ENOLCK),
E(ENOLINK),
E(ENOMEDIUM),
E(ENOMEM),
E(ENOMSG),
E(ENONET),
E(ENOPKG),
E(ENOPROTOOPT),
E(ENOSPC),
E(ENOSR),
E(ENOSTR),
#ifdef ENOSYM
E(ENOSYM),
#endif
E(ENOSYS),
E(ENOTBLK),
E(ENOTCONN),
E(ENOTDIR),
E(ENOTEMPTY),
E(ENOTNAM),
E(ENOTRECOVERABLE),
E(ENOTSOCK),
E(ENOTTY),
E(ENOTUNIQ),
E(ENXIO),
E(EOPNOTSUPP),
E(EOVERFLOW),
E(EOWNERDEAD),
E(EPERM),
E(EPFNOSUPPORT),
E(EPIPE),
#ifdef EPROCLIM
E(EPROCLIM),
#endif
E(EPROTO),
E(EPROTONOSUPPORT),
E(EPROTOTYPE),
E(ERANGE),
E(EREMCHG),
#ifdef EREMDEV
E(EREMDEV),
#endif
E(EREMOTE),
E(EREMOTEIO),
#ifdef EREMOTERELEASE
E(EREMOTERELEASE),
#endif
E(ERESTART),
E(ERFKILL),
E(EROFS),
#ifdef ERREMOTE
E(ERREMOTE),
#endif
E(ESHUTDOWN),
E(ESOCKTNOSUPPORT),
E(ESPIPE),
E(ESRCH),
E(ESRMNT),
E(ESTALE),
E(ESTRPIPE),
E(ETIME),
E(ETIMEDOUT),
E(ETOOMANYREFS),
E(ETXTBSY),
E(EUCLEAN),
E(EUNATCH),
E(EUSERS),
E(EXDEV),
E(EXFULL),
};
#undef E
#ifdef EREFUSED /* parisc */
static_assert(EREFUSED == ECONNREFUSED);
#endif
#ifdef ECANCELLED /* parisc */
static_assert(ECANCELLED == ECANCELED);
#endif
static_assert(EAGAIN == EWOULDBLOCK); /* everywhere */
#define E(err) [err - 512 + BUILD_BUG_ON_ZERO(err < 512 || err > 550)] = "-" #err
static const char *names_512[] = {
E(ERESTARTSYS),
E(ERESTARTNOINTR),
E(ERESTARTNOHAND),
E(ENOIOCTLCMD),
E(ERESTART_RESTARTBLOCK),
E(EPROBE_DEFER),
E(EOPENSTALE),
E(ENOPARAM),
E(EBADHANDLE),
E(ENOTSYNC),
E(EBADCOOKIE),
E(ENOTSUPP),
E(ETOOSMALL),
E(ESERVERFAULT),
E(EBADTYPE),
E(EJUKEBOX),
E(EIOCBQUEUED),
E(ERECALLCONFLICT),
};
#undef E
static const char *__errname(unsigned err)
{
if (err < ARRAY_SIZE(names_0))
return names_0[err];
if (err >= 512 && err - 512 < ARRAY_SIZE(names_512))
return names_512[err - 512];
/* But why? */
if (IS_ENABLED(CONFIG_MIPS) && err == EDQUOT) /* 1133 */
return "-EDQUOT";
return NULL;
}
/*
* errname(EIO) -> "EIO"
* errname(-EIO) -> "-EIO"
*/
const char *errname(int err)
{
const char *name = __errname(abs(err));
if (!name)
return NULL;
return err > 0 ? name + 1 : name;
}
EXPORT_SYMBOL(errname);