Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
tools/nolibc: fold llseek fallback into lseek()
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
+14
-28
+14
-28
tools/include/nolibc/sys.h
+14
-28
tools/include/nolibc/sys.h
···
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#if defined(__NR_lseek)
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return my_syscall3(__NR_lseek, fd, offset, whence);
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#else
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-
return __nolibc_enosys(__func__, fd, offset, whence);
598
-
#endif
599
-
}
597
+
__kernel_loff_t loff = 0;
598
+
off_t result;
599
+
int ret;
600
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601
-
static __attribute__((unused))
602
-
int sys_llseek(int fd, unsigned long offset_high, unsigned long offset_low,
603
-
__kernel_loff_t *result, int whence)
604
-
{
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-
#if defined(__NR_llseek)
606
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return my_syscall5(__NR_llseek, fd, offset_high, offset_low, result, whence);
607
-
#else
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-
return __nolibc_enosys(__func__, fd, offset_high, offset_low, result, whence);
601
+
/* Only exists on 32bit where nolibc off_t is also 32bit */
602
+
ret = my_syscall5(__NR_llseek, fd, 0, offset, &loff, whence);
603
+
if (ret < 0)
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+
result = ret;
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+
else if (loff != (off_t)loff)
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+
result = -EOVERFLOW;
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+
else
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result = loff;
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+
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+
return result;
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#endif
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}
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static __attribute__((unused))
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off_t lseek(int fd, off_t offset, int whence)
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{
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-
__kernel_loff_t loff = 0;
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-
off_t result;
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int ret;
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-
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result = sys_lseek(fd, offset, whence);
620
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if (result == -ENOSYS) {
621
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/* Only exists on 32bit where nolibc off_t is also 32bit */
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-
ret = sys_llseek(fd, 0, offset, &loff, whence);
623
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if (ret < 0)
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result = ret;
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-
else if (loff != (off_t)loff)
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-
result = -EOVERFLOW;
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-
else
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-
result = loff;
629
-
}
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-
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-
return __sysret(result);
617
+
return __sysret(sys_lseek(fd, offset, whence));
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}
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619
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