[PATCH] Document functions xmemdupz(), xread() and xwrite()
Signed-off-by: Heikki Orsila <heikki.orsila@iki.fi>
---
git-compat-util.h | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/git-compat-util.h b/git-compat-util.h
index a18235e..7498bee 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -268,6 +268,12 @@ static inline void *xmalloc(size_t size)
return ret;
}
+/*
+ * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
+ * "data" to the allocated memory, zero terminates the allocated memory,
+ * and returns a pointer to the allocated memory. If the allocation fails,
+ * the program dies.
+ */
static inline void *xmemdupz(const void *data, size_t len)
{
char *p = xmalloc(len + 1);
@@ -329,6 +335,11 @@ static inline void *xmmap(void *start, size_t length,
return ret;
}
+/*
+ * xread() is the same a read(), but it automatically restarts read()
+ * operations with a recoverable error (EAGAIN and EINTR). xread()
+ * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
+ */
static inline ssize_t xread(int fd, void *buf, size_t len)
{
ssize_t nr;
@@ -340,6 +351,9 @@ static inline ssize_t xread(int fd, void *buf, size_t len)
}
}
+/*
+ * xwrite() is similar to xread()
+ */
static inline ssize_t xwrite(int fd, const void *buf, size_t len)
{
ssize_t nr;
--
1.5.4.4