[project @ 1998-02-02 17:27:26 by simonm]

[ghc-hetmet.git] / ghc / lib / misc / cbits / readDescriptor.c

diff --git a/ghc/lib/misc/cbits/readDescriptor.c b/ghc/lib/misc/cbits/readDescriptor.c
new file mode 100644 (file)
index 0000000..21714bf
--- /dev/null
+++ b/ghc/lib/misc/cbits/readDescriptor.c
@@ -0,0 +1,60 @@
+#if 0
+%
+% (c) The GRASP/AQUA Project, Glasgow University, 1996
+%
+\subsection[readDescriptor.lc]{Suck some bytes from a descriptor}
+
+\begin{code}
+#endif
+
+#define NON_POSIX_SOURCE
+#include "rtsdefs.h"
+#include "ghcSockets.h"
+
+StgInt
+readDescriptor(I_ fd, A_ buf, I_ nbytes)
+{
+    StgInt sucked;
+    
+    while ((sucked = read((int) fd, (char *) buf, (int) nbytes)) < 0) {
+      if (errno != EINTR) {
+         cvtErrno();
+         switch (ghc_errno) {
+         default:
+             stdErrno();
+             break;
+         case GHC_EBADF:
+                     ghc_errtype = ERR_INVALIDARGUMENT;
+              ghc_errstr  = "Not a valid write descriptor";
+             break;
+         case GHC_EBADMSG:
+                     ghc_errtype = ERR_SYSTEMERROR;
+              ghc_errstr  = "Message waiting to be read is not a data message";
+             break;
+         case GHC_EFAULT:
+                     ghc_errtype = ERR_INVALIDARGUMENT;
+              ghc_errstr  = "Data buffer not in writeable part of user address space";
+             break;
+         case GHC_EINVAL:
+             ghc_errtype = ERR_INVALIDARGUMENT;
+             ghc_errstr  = "Seek pointer associated with descriptor negative";
+             break;
+         case GHC_EIO:
+             ghc_errtype = ERR_SYSTEMERROR;
+             ghc_errstr  = "I/O error occurred while writing to file system";
+             break;
+         case GHC_EISDIR:
+             ghc_errtype = ERR_INAPPROPRIATETYPE;
+             ghc_errstr  = "Descriptor refers to a directory";
+             break;
+         case GHC_EAGAIN:
+         case GHC_EWOULDBLOCK:
+             ghc_errtype = ERR_OTHERERROR;
+             ghc_errstr  = "No data could be written immediately";
+             break;
+         }
+         return -1;
+      }
+    }
+    return sucked;
+}