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dirent: conditionalize dirent assert based on dirent64 existence

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>=musl-1.2.4 doesn't define dirent64 and its LFS friends as its "native"
functions are already LFS-aware.

Check for dirent64 in meson.build and only assert if it exists.

Bug: https://bugs.gentoo.org/905900
Closes: https://github.com/systemd/systemd/pull/25809
This commit is contained in:
Sam James 2023-05-10 01:47:13 +01:00 committed by Yu Watanabe
parent 8707dcdf3b
commit eb29296937
2 changed files with 4 additions and 0 deletions
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2
meson.build
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@ -544,6 +544,7 @@ assert(long_max > 100000)
conf.set_quoted('LONG_MAX_STR', '@0@'.format(long_max))
decl_headers = '''
#include <dirent.h>
#include <uchar.h>
#include <sys/mount.h>
#include <sys/stat.h>
@ -553,6 +554,7 @@ foreach decl : ['char16_t',
'char32_t',
'struct mount_attr',
'struct statx',
'struct dirent64',
]
# We get -1 if the size cannot be determined

2
src/basic/dirent-util.h
View File

@ -36,6 +36,7 @@ struct dirent *readdir_no_dot(DIR *dirp);
/* Only if 64bit off_t is enabled struct dirent + struct dirent64 are actually the same. We require this, and
* we want them to be interchangeable to make getdents64() work, hence verify that. */
assert_cc(_FILE_OFFSET_BITS == 64);
#if HAVE_STRUCT_DIRENT64
assert_cc(sizeof(struct dirent) == sizeof(struct dirent64));
assert_cc(offsetof(struct dirent, d_ino) == offsetof(struct dirent64, d_ino));
assert_cc(sizeof_field(struct dirent, d_ino) == sizeof_field(struct dirent64, d_ino));
@ -47,6 +48,7 @@ assert_cc(offsetof(struct dirent, d_type) == offsetof(struct dirent64, d_type));
assert_cc(sizeof_field(struct dirent, d_type) == sizeof_field(struct dirent64, d_type));
assert_cc(offsetof(struct dirent, d_name) == offsetof(struct dirent64, d_name));
assert_cc(sizeof_field(struct dirent, d_name) == sizeof_field(struct dirent64, d_name));
#endif
#define FOREACH_DIRENT_IN_BUFFER(de, buf, sz) \
for (void *_end = (uint8_t*) ({ (de) = (buf); }) + (sz); \