unpack-trees: allow Porcelain to give different error messages

diff --git a/git-compat-util.h b/git-compat-util.h
index 9d04faefb8c88c1ab7b2e80b57679374c684d102..01c4045e89a2e156062255193ed5d865fdf8a922 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -68,6 +68,7 @@
 #include <sys/poll.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>
+#include <utime.h>
 #ifndef NO_SYS_SELECT_H
 #include <sys/select.h>
 #endif
@@ -205,6 +206,9 @@ void *gitmemmem(const void *haystack, size_t haystacklen,
 #endif
 
 #ifdef FREAD_READS_DIRECTORIES
+#ifdef fopen
+#undef fopen
+#endif
 #define fopen(a,b) git_fopen(a,b)
 extern FILE *git_fopen(const char*, const char*);
 #endif
@@ -267,6 +271,12 @@ 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);
@@ -328,6 +338,11 @@ 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;
@@ -339,6 +354,11 @@ static inline ssize_t xread(int fd, void *buf, size_t len)
        }
 }
 
+/*
+ * xwrite() is the same a write(), but it automatically restarts write()
+ * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
+ * GUARANTEE that "len" bytes is written even if the operation is successful.
+ */
 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 {
        ssize_t nr;
@@ -446,4 +466,10 @@ void git_qsort(void *base, size_t nmemb, size_t size,
 #define qsort git_qsort
 #endif
 
+#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
+# define FORCE_DIR_SET_GID S_ISGID
+#else
+# define FORCE_DIR_SET_GID 0
+#endif
+
 #endif