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tst-xdirent: Fix allocating dirent for readdir_r call 

As documented in the glibc manual, “Some systems don’t define the d_name
element sufficiently long”, and it provides an example of using a union to
properly allocate the storage under the dirent.
This commit is contained in:
Samuel Thibault 2025-01-07 01:56:41 +01:00
parent 75fed76dfd
commit 2d196c2e10
1 changed files with 8 additions and 4 deletions
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12
support/tst-xdirent.c
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@ -50,10 +50,14 @@ do_test (void)
{
DIR *d = xopendir (".");
struct dirent buf = { 0, };
TEST_VERIFY (xreaddir_r (d, &buf));
TEST_COMPARE_STRING (buf.d_name, ".");
while (xreaddir_r (d, &buf))
union
{
struct dirent d;
char b[offsetof (struct dirent, d_name) + NAME_MAX + 1];
} buf;
TEST_VERIFY (xreaddir_r (d, &buf.d));
TEST_COMPARE_STRING (buf.d.d_name, ".");
while (xreaddir_r (d, &buf.d))
;
xclosedir (d);
}