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This incorporates: 2019-09-22 Update some URLs 2019-09-15 fcntl-h: fix compilation error of creat.c on MSVC 2019-09-15 creat: new module 2019-09-15 access: new module 2019-09-09 Add option to assume best, not worst, when cross-compiling. * build-aux/config.guess, build-aux/config.sub, doc/misc/texinfo.tex: * lib/careadlinkat.c, lib/careadlinkat.h, lib/count-leading-zeros.h: * lib/count-trailing-zeros.h, lib/diffseq.h, lib/fcntl.in.h: * lib/ftoastr.c, lib/get-permissions.c: * lib/ieee754.in.h, lib/inttypes.in.h, lib/mktime.c, lib/open.c: * lib/pathmax.h, lib/pipe2.c, lib/stddef.in.h, lib/stdint.in.h: * lib/stdlib.in.h, lib/str-two-way.h, lib/string.in.h, lib/time.in.h: * lib/timegm.c, lib/unistd.in.h, m4/canonicalize.m4: * m4/extern-inline.m4, m4/fcntl_h.m4, m4/fdopendir.m4: * m4/getgroups.m4, m4/getopt.m4, m4/gettimeofday.m4: * m4/gnulib-common.m4, m4/largefile.m4: * m4/lstat.m4, m4/memmem.m4, m4/mktime.m4, m4/nocrash.m4, m4/open.m4: * m4/pselect.m4, m4/putenv.m4, m4/readlink.m4, m4/regex.m4: * m4/symlink.m4, m4/unistd_h.m4, m4/utimens.m4, m4/utimes.m4: Copy from Gnulib. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate. * m4/open-slash.m4: New file, copied from Gnulib.
68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/* Read symbolic links into a buffer without size limitation, relative to fd.
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Copyright (C) 2011-2019 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert, Bruno Haible, and Jim Meyering. */
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#ifndef _GL_CAREADLINKAT_H
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#define _GL_CAREADLINKAT_H
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#include <fcntl.h>
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#include <unistd.h>
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struct allocator;
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/* Assuming the current directory is FD, get the symbolic link value
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of FILENAME as a null-terminated string and put it into a buffer.
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If FD is AT_FDCWD, FILENAME is interpreted relative to the current
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working directory, as in openat.
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If the link is small enough to fit into BUFFER put it there.
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BUFFER's size is BUFFER_SIZE, and BUFFER can be null
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if BUFFER_SIZE is zero.
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If the link is not small, put it into a dynamically allocated
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buffer managed by ALLOC. It is the caller's responsibility to free
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the returned value if it is nonnull and is not BUFFER.
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The PREADLINKAT function specifies how to read links. It operates
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like POSIX readlinkat()
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<https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html>
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but can assume that its first argument is the same as FD.
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If successful, return the buffer address; otherwise return NULL and
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set errno. */
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char *careadlinkat (int fd, char const *filename,
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char *buffer, size_t buffer_size,
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struct allocator const *alloc,
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ssize_t (*preadlinkat) (int, char const *,
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char *, size_t));
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/* Suitable value for careadlinkat's FD argument. */
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#if HAVE_READLINKAT
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/* AT_FDCWD is declared in <fcntl.h>. */
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#else
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/* Define AT_FDCWD independently, so that the careadlinkat module does
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not depend on the fcntl-h module. We might as well use the same value
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as fcntl-h. */
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# ifndef AT_FDCWD
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# define AT_FDCWD (-3041965)
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# endif
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#endif
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#endif /* _GL_CAREADLINKAT_H */
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