1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/build_bug.h>
  3#include <linux/errno.h>
  4#include <linux/errname.h>
  5#include <linux/kernel.h>
  6#include <linux/math.h>
  7
  8/*
  9 * Ensure these tables do not accidentally become gigantic if some
 10 * huge errno makes it in. On most architectures, the first table will
 11 * only have about 140 entries, but mips and parisc have more sparsely
 12 * allocated errnos (with EHWPOISON = 257 on parisc, and EDQUOT = 1133
 13 * on mips), so this wastes a bit of space on those - though we
 14 * special case the EDQUOT case.
 15 */
 16#define E(err) [err + BUILD_BUG_ON_ZERO(err <= 0 || err > 300)] = "-" #err
 17static const char *names_0[] = {
 18	E(E2BIG),
 19	E(EACCES),
 20	E(EADDRINUSE),
 21	E(EADDRNOTAVAIL),
 22	E(EADV),
 23	E(EAFNOSUPPORT),
 24	E(EALREADY),
 25	E(EBADE),
 26	E(EBADF),
 27	E(EBADFD),
 28	E(EBADMSG),
 29	E(EBADR),
 30	E(EBADRQC),
 31	E(EBADSLT),
 32	E(EBFONT),
 33	E(EBUSY),
 34#ifdef ECANCELLED
 35	E(ECANCELLED),
 36#endif
 37	E(ECHILD),
 38	E(ECHRNG),
 39	E(ECOMM),
 40	E(ECONNABORTED),
 41	E(ECONNRESET),
 42	E(EDEADLOCK),
 43	E(EDESTADDRREQ),
 44	E(EDOM),
 45	E(EDOTDOT),
 46#ifndef CONFIG_MIPS
 47	E(EDQUOT),
 48#endif
 49	E(EEXIST),
 50	E(EFAULT),
 51	E(EFBIG),
 52	E(EHOSTDOWN),
 53	E(EHOSTUNREACH),
 54	E(EHWPOISON),
 55	E(EIDRM),
 56	E(EILSEQ),
 57#ifdef EINIT
 58	E(EINIT),
 59#endif
 60	E(EINPROGRESS),
 61	E(EINTR),
 62	E(EINVAL),
 63	E(EIO),
 64	E(EISCONN),
 65	E(EISDIR),
 66	E(EISNAM),
 67	E(EKEYEXPIRED),
 68	E(EKEYREJECTED),
 69	E(EKEYREVOKED),
 70	E(EL2HLT),
 71	E(EL2NSYNC),
 72	E(EL3HLT),
 73	E(EL3RST),
 74	E(ELIBACC),
 75	E(ELIBBAD),
 76	E(ELIBEXEC),
 77	E(ELIBMAX),
 78	E(ELIBSCN),
 79	E(ELNRNG),
 80	E(ELOOP),
 81	E(EMEDIUMTYPE),
 82	E(EMFILE),
 83	E(EMLINK),
 84	E(EMSGSIZE),
 85	E(EMULTIHOP),
 86	E(ENAMETOOLONG),
 87	E(ENAVAIL),
 88	E(ENETDOWN),
 89	E(ENETRESET),
 90	E(ENETUNREACH),
 91	E(ENFILE),
 92	E(ENOANO),
 93	E(ENOBUFS),
 94	E(ENOCSI),
 95	E(ENODATA),
 96	E(ENODEV),
 97	E(ENOENT),
 98	E(ENOEXEC),
 99	E(ENOKEY),
100	E(ENOLCK),
101	E(ENOLINK),
102	E(ENOMEDIUM),
103	E(ENOMEM),
104	E(ENOMSG),
105	E(ENONET),
106	E(ENOPKG),
107	E(ENOPROTOOPT),
108	E(ENOSPC),
109	E(ENOSR),
110	E(ENOSTR),
111#ifdef ENOSYM
112	E(ENOSYM),
113#endif
114	E(ENOSYS),
115	E(ENOTBLK),
116	E(ENOTCONN),
117	E(ENOTDIR),
118	E(ENOTEMPTY),
119	E(ENOTNAM),
120	E(ENOTRECOVERABLE),
121	E(ENOTSOCK),
122	E(ENOTTY),
123	E(ENOTUNIQ),
124	E(ENXIO),
125	E(EOPNOTSUPP),
126	E(EOVERFLOW),
127	E(EOWNERDEAD),
128	E(EPERM),
129	E(EPFNOSUPPORT),
130	E(EPIPE),
131#ifdef EPROCLIM
132	E(EPROCLIM),
133#endif
134	E(EPROTO),
135	E(EPROTONOSUPPORT),
136	E(EPROTOTYPE),
137	E(ERANGE),
138	E(EREMCHG),
139#ifdef EREMDEV
140	E(EREMDEV),
141#endif
142	E(EREMOTE),
143	E(EREMOTEIO),
144#ifdef EREMOTERELEASE
145	E(EREMOTERELEASE),
146#endif
147	E(ERESTART),
148	E(ERFKILL),
149	E(EROFS),
150#ifdef ERREMOTE
151	E(ERREMOTE),
152#endif
153	E(ESHUTDOWN),
154	E(ESOCKTNOSUPPORT),
155	E(ESPIPE),
156	E(ESRCH),
157	E(ESRMNT),
158	E(ESTALE),
159	E(ESTRPIPE),
160	E(ETIME),
161	E(ETIMEDOUT),
162	E(ETOOMANYREFS),
163	E(ETXTBSY),
164	E(EUCLEAN),
165	E(EUNATCH),
166	E(EUSERS),
167	E(EXDEV),
168	E(EXFULL),
169
170	E(ECANCELED), /* ECANCELLED */
171	E(EAGAIN), /* EWOULDBLOCK */
172	E(ECONNREFUSED), /* EREFUSED */
173	E(EDEADLK), /* EDEADLOCK */
174};
175#undef E
176
177#define E(err) [err - 512 + BUILD_BUG_ON_ZERO(err < 512 || err > 550)] = "-" #err
178static const char *names_512[] = {
179	E(ERESTARTSYS),
180	E(ERESTARTNOINTR),
181	E(ERESTARTNOHAND),
182	E(ENOIOCTLCMD),
183	E(ERESTART_RESTARTBLOCK),
184	E(EPROBE_DEFER),
185	E(EOPENSTALE),
186	E(ENOPARAM),
187
188	E(EBADHANDLE),
189	E(ENOTSYNC),
190	E(EBADCOOKIE),
191	E(ENOTSUPP),
192	E(ETOOSMALL),
193	E(ESERVERFAULT),
194	E(EBADTYPE),
195	E(EJUKEBOX),
196	E(EIOCBQUEUED),
197	E(ERECALLCONFLICT),
198};
199#undef E
200
201static const char *__errname(unsigned err)
202{
203	if (err < ARRAY_SIZE(names_0))
204		return names_0[err];
205	if (err >= 512 && err - 512 < ARRAY_SIZE(names_512))
206		return names_512[err - 512];
207	/* But why? */
208	if (IS_ENABLED(CONFIG_MIPS) && err == EDQUOT) /* 1133 */
209		return "-EDQUOT";
210	return NULL;
211}
212
213/*
214 * errname(EIO) -> "EIO"
215 * errname(-EIO) -> "-EIO"
216 */
217const char *errname(int err)
218{
219	const char *name = __errname(abs(err));
220	if (!name)
221		return NULL;
222
223	return err > 0 ? name + 1 : name;
224}