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# Copyright (C) 1991-2025 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
# errno.texinfo contains lines like:
# @errno{ENOSYS, 123, Function not implemented}
BEGIN {
print "/* This file generated by errnos.awk from";
for (i = 1; i < ARGC; i++)
{
arg = ARGV[i];
sub(/.*(manual|include|-gnu)\//, "", arg);
if (arg ~ /.*errnos.d/) continue;
print " " arg;
}
print " Do not edit this file; edit errnos.awk and regenerate it. */";
print "";
print "#ifndef _BITS_ERRNO_H";
print "#define _BITS_ERRNO_H 1";
print "";
print "#if !defined _ERRNO_H";
print "# error \"Never include <bits/errno.h> directly; use <errno.h> instead.\"";
print "#endif";
maxerrno = 0;
maxerrlen = 0;
in_mach_errors = "";
seq = 0;
}
/^@errno\{/ \
{
e = substr($1, 8, length($1)-8)
if (length(e) > maxerrlen)
maxerrlen = length(e);
if (e == "EWOULDBLOCK")
{
econsts[seq] = e;
errnos[seq] = "EAGAIN";
seq++;
next;
}
errno = substr($2, 1, length($2)-1) + 0;
if (errno == 0)
next;
if (errno > 0x3ffff)
{
printf("%s:%d: errno value %d too large for the Hurd\n",
FILENAME, NR, errno) >> "/dev/stderr";
exit 1;
}
if (errno > maxerrno)
maxerrno = errno;
etext = "";
for (i = 3; i <= NF; ++i)
etext = etext " " $i;
etext = substr(etext, 2, length(etext)-2);
econsts[seq] = e;
errnos[seq] = sprintf("0x%08x", 0x40000000 + errno);
etexts[seq] = etext;
seq++;
next;
}
NF == 3 && $1 == "#define" && $2 == "MACH_SEND_IN_PROGRESS" \
{
in_mach_errors = FILENAME;
annot[seq++] = "\n/* Errors from <mach/message.h>. */";
}
NF == 3 && $1 == "#define" && $2 == "KERN_SUCCESS" \
{
in_mach_errors = FILENAME;
annot[seq++] = "\n/* Errors from <mach/kern_return.h>. */";
next;
}
in_mach_errors != "" && $2 == "MACH_IPC_COMPAT" \
{
in_mach_errors = "";
}
# FIXME: mach/message.h and mach/kern_return.h do include error
# descriptions which we could slurp, but some of them are very long,
# we would need to word-wrap them.
in_mach_errors == FILENAME && NF == 3 && $1 == "#define" \
{
e = "E" $2;
if (length(e) > maxerrlen)
maxerrlen = length(e);
econsts[seq] = e;
errnos[seq] = $3;
etexts[seq] = "";
seq++;
}
$1 == "#define" && $2 == "_MACH_MIG_ERRORS_H_" \
{
in_mig_errors = 1;
annot[seq++] = "\n/* Errors from <mach/mig_errors.h>. */";
next;
}
in_mig_errors && $1 == "#endif" && $3 == "_MACH_MIG_ERRORS_H_" \
{
in_mig_errors = 0;
}
(in_mig_errors && $1 == "#define" && $3 <= -300) || \
(in_device_errors && $1 == "#define" && /D_/ && NF > 3) \
{
etext = "";
for (i = 5; i < NF; ++i)
etext = etext " " $i;
e = "E" $2;
if (length(e) > maxerrlen)
maxerrlen = length(e);
econsts[seq] = e;
errnos[seq] = $3;
etexts[seq] = substr(etext, 2, length(etext)-1);
seq++;
}
$1 == "#define" && $2 == "D_SUCCESS" \
{
in_device_errors = 1;
annot[seq++] = "\n/* Errors from <device/device_types.h>. */";
next;
}
in_device_errors && $1 == "#endif" \
{
in_device_errors = 0;
}
function print_errno_enum(maxseq)
{
print "";
print "#ifndef __ASSEMBLER__";
print "";
print "enum __error_t_codes";
print "{";
print " /* The value zero always means success and it is perfectly fine";
print " for code to use 0 explicitly (or implicitly, e.g. via Boolean";
print " coercion.) Having an enum entry for zero both makes the";
print " debugger print the name for error_t-typed zero values, and";
print " prevents the compiler from issuing warnings about 'case 0:'";
print " in a switch on an error_t-typed value. */";
printf(" %-*s = 0,\n", maxerrlen, "ESUCCESS");
print "";
print " /* The Hurd uses Mach error system 0x10, subsystem 0. */";
for (i = 0; i < maxseq; i++)
{
if (i in annot)
print annot[i];
else if (i in etexts && etexts[i] != "")
printf(" %-*s = %s,\t/* %s */\n",
maxerrlen, econsts[i], errnos[i], etexts[i]);
else if (errnos[i] != "EAGAIN")
printf(" %-*s = %s,\n", maxerrlen, econsts[i], errnos[i]);
}
print "";
print " /* Because the C standard requires that errno have type 'int',"
print " this enumeration must be a signed type. */";
print " __FORCE_ERROR_T_CODES_SIGNED = -1";
print "};";
print "";
print "#endif /* not __ASSEMBLER__ */";
}
function print_errno_defines(maxseq)
{
print "";
print "/* The C standard requires that all of the E-constants be"
print " defined as macros. */"
print "";
for (i = 0; i < maxseq; i++)
{
if (i in annot)
print annot[i];
else
printf("#define %-*s %s\n", maxerrlen, econsts[i], errnos[i]);
}
print "";
printf("#define _HURD_ERRNOS %d\n", maxerrno+1);
}
END \
{
print_errno_enum(seq);
print_errno_defines(seq);
print "";
print "#endif /* bits/errno.h. */";
}
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