[lttng-dev] [PATCH urcu] fix: handle EINTR correctly in get_cpu_mask_from_sysfs

[Benjamin Marzinski]

If the read() in get_cpu_mask_from_sysfs() fails with EINTR, the code is
supposed to retry, but the while loop condition has (bytes_read > 0),
which is false when read() fails with EINTR. The result is that the code
exits the loop, having only read part of the string.

Use (bytes_read != 0) in the while loop condition instead, since the
(bytes_read < 0) case is already handled in the loop.

Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
---
 src/compat-smp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compat-smp.h b/src/compat-smp.h
index 31fa979..075a332 100644
--- a/src/compat-smp.h
+++ b/src/compat-smp.h
@@ -164,7 +164,7 @@ static inline int get_cpu_mask_from_sysfs(char *buf, size_t max_bytes, const cha
 
 		total_bytes_read += bytes_read;
 		assert(total_bytes_read <= max_bytes);
-	} while (max_bytes > total_bytes_read && bytes_read > 0);
+	} while (max_bytes > total_bytes_read && bytes_read != 0);
 
 	/*
 	 * Make sure the mask read is a null terminated string.
-- 
2.44.0