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missing: add getdents64() syscall wrapper

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glibc 2.30 (Aug 2019) added a wrapper for getdents64(). For older
versions let's define our own.

(This syscall exists since Linux 2.4, hence should be safe to use for
us)
This commit is contained in:
Lennart Poettering 2021-10-08 10:46:02 +02:00
parent b1967fb83a
commit aab35b1e59
2 changed files with 17 additions and 0 deletions
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1
meson.build
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@ -546,6 +546,7 @@ foreach ident : [
['mount_setattr', '''#include <sys/mount.h>'''], ['mount_setattr', '''#include <sys/mount.h>'''],
['move_mount', '''#include <sys/mount.h>'''], ['move_mount', '''#include <sys/mount.h>'''],
['open_tree', '''#include <sys/mount.h>'''], ['open_tree', '''#include <sys/mount.h>'''],
['getdents64', '''#include <dirent.h>'''],
] ]
have = cc.has_function(ident[0], prefix : ident[1], args : '-D_GNU_SOURCE') have = cc.has_function(ident[0], prefix : ident[1], args : '-D_GNU_SOURCE')

16
src/basic/missing_syscall.h
View File

@ -540,3 +540,19 @@ static inline int missing_move_mount(
# define move_mount missing_move_mount # define move_mount missing_move_mount
#endif #endif
/* ======================================================================= */
#if !HAVE_GETDENTS64
static inline ssize_t missing_getdents64(int fd, void *buffer, size_t length) {
# if defined __NR_getdents64 && __NR_getdents64 >= 0
return syscall(__NR_getdents64, fd, buffer, length);
# else
errno = ENOSYS;
return -1;
# endif
}
# define getdents64 missing_getdents64
#endif