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tools/nolibc: fold llseek fallback into lseek()

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Align the implementation of the fallback handling inside sys_lseek()
with the rest of nolibc.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-5-4b63f2caaa89@weissschuh.net
This commit is contained in:
Thomas Weißschuh
2025-08-21 17:40:36 +02:00
parent fbd47de755
commit f11e156e0f
1 changed files with 14 additions and 28 deletions
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42
tools/include/nolibc/sys.h
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@@ -594,41 +594,27 @@ off_t sys_lseek(int fd, off_t offset, int whence)
#if defined(__NR_lseek)
return my_syscall3(__NR_lseek, fd, offset, whence);
#else
return __nolibc_enosys(__func__, fd, offset, whence);
#endif
}
__kernel_loff_t loff = 0;
off_t result;
int ret;
static __attribute__((unused))
int sys_llseek(int fd, unsigned long offset_high, unsigned long offset_low,
__kernel_loff_t *result, int whence)
{
#if defined(__NR_llseek)
return my_syscall5(__NR_llseek, fd, offset_high, offset_low, result, whence);
#else
return __nolibc_enosys(__func__, fd, offset_high, offset_low, result, whence);
/* Only exists on 32bit where nolibc off_t is also 32bit */
ret = my_syscall5(__NR_llseek, fd, 0, offset, &loff, whence);
if (ret < 0)
result = ret;
else if (loff != (off_t)loff)
result = -EOVERFLOW;
else
result = loff;
return result;
#endif
}
static __attribute__((unused))
off_t lseek(int fd, off_t offset, int whence)
{
__kernel_loff_t loff = 0;
off_t result;
int ret;
result = sys_lseek(fd, offset, whence);
if (result == -ENOSYS) {
/* Only exists on 32bit where nolibc off_t is also 32bit */
ret = sys_llseek(fd, 0, offset, &loff, whence);
if (ret < 0)
result = ret;
else if (loff != (off_t)loff)
result = -EOVERFLOW;
else
result = loff;
}
return __sysret(result);
return __sysret(sys_lseek(fd, offset, whence));
}