From 3b0d474dd52fab80a5adca3b4b82c2db47a88657 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Mon, 23 Sep 2002 21:20:02 +0000
Subject: [PATCH] Introduced bfdopen_shared() which behaves like bfdopen(), but
 on bclose() the fd is left open. Especially useful for buffering stdin/out.

---
 lib/buckettool.c |  4 ++--
 lib/fastbuf.h    |  3 ++-
 lib/fb-file.c    | 19 ++++++++++++++++---
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/lib/buckettool.c b/lib/buckettool.c
index b2f51715..ae55b3ca 100644
--- a/lib/buckettool.c
+++ b/lib/buckettool.c
@@ -108,7 +108,7 @@ insert(void)
   struct obuck_header h;
   byte *e;
 
-  in = bfdopen(0, 4096);
+  in = bfdopen_shared(0, 4096);
   obuck_init(1);
   do
     {
@@ -123,7 +123,7 @@ insert(void)
     }
   while (e);
   obuck_cleanup();
-  /* bclose(in) not done, we don't want fd 0 closed */
+  bclose(in);
 }
 
 static void
diff --git a/lib/fastbuf.h b/lib/fastbuf.h
index f3a05952..7baa5013 100644
--- a/lib/fastbuf.h
+++ b/lib/fastbuf.h
@@ -69,13 +69,14 @@ struct fastbuf {
 struct fb_file {
   struct fastbuf fb;
   int fd;				/* File descriptor, -1 if not a real file */
-  int is_temp_file;			/* Is a temporary file, delete on close */
+  int is_temp_file;			/* 0=normal file, 1=temporary file, delete on close, -1=shared FD */
 };
 #define FB_FILE(f) ((struct fb_file *)(f)->is_fastbuf)
 
 struct fastbuf *bopen(byte *name, uns mode, uns buffer);
 struct fastbuf *bopen_tmp(uns buffer);
 struct fastbuf *bfdopen(int fd, uns buffer);
+struct fastbuf *bfdopen_shared(int fd, uns buffer);
 void bbcopy(struct fastbuf *f, struct fastbuf *t, uns l);
 #define FB_IS_TEMP_FILE(f) FB_FILE(f)->is_temp_file
 
diff --git a/lib/fb-file.c b/lib/fb-file.c
index 1fc85de5..73a2f143 100644
--- a/lib/fb-file.c
+++ b/lib/fb-file.c
@@ -63,9 +63,14 @@ bfd_seek(struct fastbuf *f, sh_off_t pos, int whence)
 static void
 bfd_close(struct fastbuf *f)
 {
-  close(FB_FILE(f)->fd);
-  if (FB_FILE(f)->is_temp_file && unlink(f->name) < 0)
-    die("unlink(%s): %m", f->name);
+  switch (FB_FILE(f)->is_temp_file)
+    {
+    case 1:
+      if (unlink(f->name) < 0)
+	log(L_ERROR, "unlink(%s): %m", f->name);
+    case 0:
+      close(FB_FILE(f)->fd);
+    }
   xfree(f);
 }
 
@@ -113,6 +118,14 @@ bfdopen(int fd, uns buffer)
   return bfdopen_internal(fd, buffer, x);
 }
 
+struct fastbuf *
+bfdopen_shared(int fd, uns buffer)
+{
+  struct fastbuf *f = bfdopen(fd, buffer);
+  FB_FILE(f)->is_temp_file = -1;
+  return f;
+}
+
 void bbcopy(struct fastbuf *f, struct fastbuf *t, uns l)
 {
   uns rf = f->bstop - f->bptr;
-- 
2.39.2