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selftests/nolibc: test large file support

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Make sure nolibc correctly handles large files.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260418-nolibc-largefile-v1-7-b91f0775bac3@weissschuh.net
This commit is contained in:
Thomas Weißschuh 2026-04-18 12:20:02 +02:00
parent ce7677458e
commit 266df86c48
1 changed files with 48 additions and 0 deletions
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48
tools/testing/selftests/nolibc/nolibc-test.c
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@ -2,6 +2,7 @@
#define _GNU_SOURCE
#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
/* libc-specific include files
* The program may be built in 3 ways:
@ -1382,6 +1383,52 @@ int test_namespace(void)
return ret;
}
int test_large_file(void)
{
off_t large_seek = ((off_t)UINT32_MAX) + 100;
int fd, ret, saved_errno;
ssize_t written;
off_t off;
#if defined(__mips__) && defined(_ABIN32)
/* https://lore.kernel.org/qemu-devel/fed03914-a95a-4522-a432-f129264cb2ac@t-8ch.de/ */
if (getpid() != 1)
return 0;
#endif
if (large_seek < UINT32_MAX) {
errno = EOVERFLOW;
return -1;
}
fd = open("/tmp", O_TMPFILE | O_RDWR, 0644);
if (fd == -1)
return -1;
off = lseek(fd, large_seek, SEEK_CUR);
if (off == -1) {
ret = off;
goto out;
} else if (off != large_seek) {
errno = ERANGE;
ret = -1;
goto out;
}
written = write(fd, "1", 1);
if (written == -1) {
ret = written;
goto out;
}
ret = 0;
out:
saved_errno = errno;
close(fd);
errno = saved_errno;
return ret;
}
/* Run syscall tests between IDs <min> and <max>.
* Return 0 on success, non-zero on failure.
*/
@ -1527,6 +1574,7 @@ int run_syscall(int min, int max)
CASE_TEST(_syscall_noargs); EXPECT_SYSEQ(is_nolibc, _syscall(__NR_getpid), getpid()); break;
CASE_TEST(_syscall_args); EXPECT_SYSEQ(is_nolibc, _syscall(__NR_statx, 0, NULL, 0, 0, NULL), -EFAULT); break;
CASE_TEST(namespace); EXPECT_SYSZR(euid0 && proc, test_namespace()); break;
CASE_TEST(largefile); EXPECT_SYSZR(1, test_large_file()); break;
case __LINE__:
return ret; /* must be last */
/* note: do not set any defaults so as to permit holes above */