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3785289f97
Inclusion of any nolibc header file should also bring all other headers. On the other hand it should also be possible to include any nolibc header files in any order. Currently this is implemented by including the catch-all nolibc.h after the headers own definitions. This is problematic if one nolibc header depends on another one. The first header has to include the other one before defining any symbols. That in turn will include the rest of nolibc while the current header has not defined anything yet. If any other part of nolibc depends on definitions from the current header, errors are encountered. This is already the case today. Effectively nolibc can only be included in the order of nolibc.h. Restructure the way "nolibc.h" is included. Move it to the beginning of the header files and before the include guards. Now any header will behave exactly like "nolibc.h" while the include guards prevent any duplicate definitions. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250424-nolibc-header-check-v1-2-011576b6ed6f@linutronix.de
100 lines
1.8 KiB
C
100 lines
1.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* Directory access for NOLIBC
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* Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
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*/
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/* make sure to include all global symbols */
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#include "nolibc.h"
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#ifndef _NOLIBC_DIRENT_H
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#define _NOLIBC_DIRENT_H
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#include "compiler.h"
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#include "stdint.h"
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#include "types.h"
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#include "fcntl.h"
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#include <linux/limits.h>
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struct dirent {
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ino_t d_ino;
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char d_name[NAME_MAX + 1];
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};
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/* See comment of FILE in stdio.h */
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typedef struct {
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char dummy[1];
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} DIR;
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static __attribute__((unused))
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DIR *fdopendir(int fd)
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{
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if (fd < 0) {
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SET_ERRNO(EBADF);
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return NULL;
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}
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return (DIR *)(intptr_t)~fd;
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}
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static __attribute__((unused))
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DIR *opendir(const char *name)
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{
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int fd;
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fd = open(name, O_RDONLY);
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if (fd == -1)
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return NULL;
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return fdopendir(fd);
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}
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static __attribute__((unused))
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int closedir(DIR *dirp)
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{
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intptr_t i = (intptr_t)dirp;
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if (i >= 0) {
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SET_ERRNO(EBADF);
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return -1;
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}
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return close(~i);
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}
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static __attribute__((unused))
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int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
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{
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char buf[sizeof(struct linux_dirent64) + NAME_MAX + 1] __nolibc_aligned_as(struct linux_dirent64);
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struct linux_dirent64 *ldir = (void *)buf;
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intptr_t i = (intptr_t)dirp;
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int fd, ret;
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if (i >= 0)
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return EBADF;
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fd = ~i;
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ret = sys_getdents64(fd, ldir, sizeof(buf));
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if (ret < 0)
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return -ret;
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if (ret == 0) {
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*result = NULL;
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return 0;
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}
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/*
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* getdents64() returns as many entries as fit the buffer.
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* readdir() can only return one entry at a time.
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* Make sure the non-returned ones are not skipped.
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*/
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ret = lseek(fd, ldir->d_off, SEEK_SET);
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if (ret == -1)
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return errno;
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entry->d_ino = ldir->d_ino;
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/* the destination should always be big enough */
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strlcpy(entry->d_name, ldir->d_name, sizeof(entry->d_name));
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*result = entry;
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return 0;
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}
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#endif /* _NOLIBC_DIRENT_H */
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