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compat_libc: add versioned symbols for lstat and readdir_r

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Ref #4997
This commit is contained in:
Benjamin Lamowski 2023-08-16 18:04:59 +02:00 committed by Christian Helmuth
parent 02c8d73426
commit 159c3d0606
1 changed files with 90 additions and 4 deletions
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94
repos/libports/src/lib/compat-libc/compat.cc
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@ -1,6 +1,7 @@
/*
* \brief FreeBSD-11 function versions
* \author Sebastian Sumpf
* \author Benjamin Lamowski
* \date 2023-06-12
*/
@ -12,15 +13,22 @@
*/
#include <stdio.h>
#define _WANT_FREEBSD11_STAT /* enable freebsd11_stat */
#define _WANT_FREEBSD11_STAT /* enable freebsd11_stat and freebsd11_dirent */
#define _KERNEL /* disable 'stat' */
#include <sys/stat.h>
#include <string.h> /* needed for memset() in dirent.h */
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
extern "C" int libc_stat(const char *, struct stat*);
extern "C" int libc_fstat(int, struct stat *);
extern "C" int libc_lstat(const char *, struct stat*);
static void _to_freebsd11(struct stat *libc_buf, struct freebsd11_stat *buf)
extern "C" int libc_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);
static void _to_freebsd11_stat(struct stat *libc_buf, struct freebsd11_stat *buf)
{
buf->st_dev = libc_buf->st_dev;
buf->st_ino = libc_buf->st_ino;
@ -38,6 +46,25 @@ static void _to_freebsd11(struct stat *libc_buf, struct freebsd11_stat *buf)
buf->st_birthtim = libc_buf->st_birthtim;
}
static bool _to_freebsd11_dirent(struct dirent *libc_buf, struct freebsd11_dirent *buf)
{
buf->d_fileno = libc_buf->d_fileno;
buf->d_type = libc_buf->d_type;
buf->d_namlen = libc_buf->d_namlen;
/* Calculation taken from FreeBSD's FREEBSD11_DIRSIZ macro */
buf->d_reclen = sizeof(struct freebsd11_dirent)
- sizeof(buf->d_name)
+ ((buf->d_namlen + 1 + 3) &~ 3);
if (libc_buf->d_namlen >= sizeof(buf->d_name))
return false;
strncpy(buf->d_name, libc_buf->d_name, sizeof(buf->d_name));
return true;
}
static void* libc_handle(void)
{
static void *handle = NULL;
@ -48,6 +75,9 @@ static void* libc_handle(void)
int (*_stat)(char const*, struct stat*);
int (*_fstat)(int, struct stat *);
int (*_lstat)(char const*, struct stat*);
int (*_readdir_r)(DIR *dirp, struct dirent *entry, struct dirent **result);
int libc_stat(const char *path, struct stat *buf)
{
@ -66,6 +96,24 @@ int libc_fstat(int fd, struct stat *buf)
return _fstat(fd, buf);
}
int libc_lstat(const char *path, struct stat *buf)
{
if (!_lstat)
_lstat = (int (*)(const char*, struct stat*)) dlsym(libc_handle(), "lstat");
return _lstat(path, buf);
}
int libc_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
{
if (!_readdir_r)
_readdir_r = (int (*)(DIR *dirp, struct dirent *entry, struct dirent **result)) dlsym(libc_handle(), "readdir_r");
return _readdir_r(dirp, entry, result);
}
extern "C" int freebsd11_stat(const char *path, struct freebsd11_stat *buf)
{
struct stat libc_buf { };
@ -73,7 +121,7 @@ extern "C" int freebsd11_stat(const char *path, struct freebsd11_stat *buf)
int err = libc_stat(path, &libc_buf);
if (err) return err;
_to_freebsd11(&libc_buf, buf);
_to_freebsd11_stat(&libc_buf, buf);
return 0;
}
@ -86,10 +134,48 @@ extern "C" int freebsd11_fstat(int fd, struct freebsd11_stat *buf)
int err = libc_fstat(fd, &libc_buf);
if (err) return err;
_to_freebsd11(&libc_buf, buf);
_to_freebsd11_stat(&libc_buf, buf);
return 0;
}
extern "C" int freebsd11_lstat(const char *path, struct freebsd11_stat *buf)
{
struct stat libc_buf { };
int err = libc_lstat(path, &libc_buf);
if (err) return err;
_to_freebsd11_stat(&libc_buf, buf);
return 0;
}
extern "C" int freebsd11_readdir_r(DIR *dirp,
struct freebsd11_dirent *entry,
struct freebsd11_dirent**result)
{
struct dirent libc_entry { };
struct dirent * libc_result;
int err = libc_readdir_r(dirp, &libc_entry, &libc_result);
if (err) return err;
if (libc_result != NULL) {
if (!_to_freebsd11_dirent(&libc_entry, entry)) {
*result = NULL;
return ENAMETOOLONG;
} else {
*result = entry;
}
}
return 0;
}
__sym_compat(fstat, freebsd11_fstat, FBSD_1.0);
__sym_compat(stat, freebsd11_stat, FBSD_1.0);
__sym_compat(lstat, freebsd11_lstat, FBSD_1.0);
__sym_compat(readdir_r, freebsd11_readdir_r, FBSD_1.0);