[PATCH v8 1/2] Add xpread()

[Yiannis Marangos <yiannis.marangos@gmail.com>]

xpread() pay attention to EAGAIN/EINTR, so it will resume
automatically on interrupted call.

Signed-off-by: Yiannis Marangos <yiannis.marangos@gmail.com>
---

This is actually the 2nd version of this commit but before I emailed
it as version 7 because it's a dependency of [PATCH v7 2/2]. Is this
the correct way to introduce a new descendant commit? Sorry, It's my
first time that I use mailing lists for contribution.

Version 8 removes xpwrite()

 builtin/index-pack.c |  2 +-
 compat/mmap.c        |  4 +---
 git-compat-util.h    |  1 +
 wrapper.c            | 18 ++++++++++++++++++
 4 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index b9f6e12..1bac0f5 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -542,7 +542,7 @@ static void *unpack_data(struct object_entry *obj,
 
 	do {
 		ssize_t n = (len < 64*1024) ? len : 64*1024;
-		n = pread(pack_fd, inbuf, n, from);
+		n = xpread(pack_fd, inbuf, n, from);
 		if (n < 0)
 			die_errno(_("cannot pread pack file"));
 		if (!n)
diff --git a/compat/mmap.c b/compat/mmap.c
index c9d46d1..7f662fe 100644
--- a/compat/mmap.c
+++ b/compat/mmap.c
@@ -14,7 +14,7 @@ void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t of
 	}
 
 	while (n < length) {
-		ssize_t count = pread(fd, (char *)start + n, length - n, offset + n);
+		ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n);
 
 		if (count == 0) {
 			memset((char *)start+n, 0, length-n);
@@ -22,8 +22,6 @@ void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t of
 		}
 
 		if (count < 0) {
-			if (errno == EAGAIN || errno == EINTR)
-				continue;
 			free(start);
 			errno = EACCES;
 			return MAP_FAILED;
diff --git a/git-compat-util.h b/git-compat-util.h
index f6d3a46..e6a4159 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -531,6 +531,7 @@ extern void *xcalloc(size_t nmemb, size_t size);
 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 extern ssize_t xread(int fd, void *buf, size_t len);
 extern ssize_t xwrite(int fd, const void *buf, size_t len);
+extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 extern int xdup(int fd);
 extern FILE *xfdopen(int fd, const char *mode);
 extern int xmkstemp(char *template);
diff --git a/wrapper.c b/wrapper.c
index 0cc5636..cf71817 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -174,6 +174,24 @@ ssize_t xwrite(int fd, const void *buf, size_t len)
 	}
 }
 
+/*
+ * xpread() is the same as pread(), but it automatically restarts pread()
+ * operations with a recoverable error (EAGAIN and EINTR). xpread() DOES
+ * NOT GUARANTEE that "len" bytes is read even if the data is available.
+ */
+ssize_t xpread(int fd, void *buf, size_t len, off_t offset)
+{
+	ssize_t nr;
+	if (len > MAX_IO_SIZE)
+	    len = MAX_IO_SIZE;
+	while (1) {
+		nr = pread(fd, buf, len, offset);
+		if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+			continue;
+		return nr;
+	}
+}
+
 ssize_t read_in_full(int fd, void *buf, size_t count)
 {
 	char *p = buf;
-- 
1.9.1