1 files changed, 132 insertions, 0 deletions
diff --git a/setedit/libmigdb/src/get_free_pty.c b/setedit/libmigdb/src/get_free_pty.c
new file mode 100644
index 0000000..8c145d0
--- /dev/null
+++ b/setedit/libmigdb/src/get_free_pty.c
@@ -0,0 +1,132 @@
+/**[txh]********************************************************************
+
+  Copyright (c) 2004 by Salvador E. Tropea.
+  Covered by the GPL license.
+
+  Module: pseudo terminal
+  Comments:
+  Helper to find a free pseudo terminal. Use this if you need to manage
+  input *and* output to the target process. If you just need output then
+  define a handler for target output stream records (assuming that this
+  is working for your particular version of gdb).
+  Usage:
+
+        mi_pty *pty = gmi_look_for_free_pty();
+        if (pty) gmi_target_terminal(mih, pty->slave);
+        ...
+        * reading from pty->master will get stdout from target *
+        * writing to pty->master will send to target stdin *
+        
+  Note: Contributed by Greg Watson (gwatson lanl gov)
+
+***************************************************************************/
+
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "mi_gdb.h"
+
+/**[txh]********************************************************************
+
+  Description:
+  Look for a free and usable pseudo terminal. Low level, use
+@x{gmi_look_for_free_pty}.
+  
+  Return: A file descriptor connected to the master pty and the name of the slave device, or <0 on error.
+  
+***************************************************************************/
+
+#ifdef __APPLE__
+
+#include <util.h>
+
+int mi_look_for_free_pty(int *master, char **slave)
+{
+ int fdmaster;
+ int fdslave;
+ static char name[BUFSIZ];
+
+ if (openpty(&fdmaster,&fdslave,name,NULL,NULL)<0)
+    return -1;
+
+ (void)close(fdslave); /* this will be reopened by gdb */
+ *master=fdmaster;
+ *slave =name;
+
+ return 0;
+}
+
+#elif defined(__linux__)
+
+int mi_look_for_free_pty(int *master, char **slave)
+{
+ if ((*master=open("/dev/ptmx",O_RDWR))<0)
+    return -1;
+ if (grantpt(*master)<0 || unlockpt(*master)<0)
+    return -1;
+ *slave = ptsname(*master);
+
+ return 0;
+}
+
+#else /* undefined o/s */
+
+int mi_look_for_free_pty(int *master, char **slave)
+{
+ return -1;
+}
+#endif
+
+/**[txh]********************************************************************
+
+  Description:
+  Look for a free and usable pseudo terminal to be used by the child.
+  
+  Return: A new mi_pty structure, you can use @x{gmi_end_pty} to
+release it.
+  
+***************************************************************************/
+
+mi_pty *gmi_look_for_free_pty()
+{
+ int master;
+ char *slave;
+ int pty=mi_look_for_free_pty(&master,&slave);
+ mi_pty *res;
+
+ if (pty<0)
+    return NULL;
+ res=(mi_pty *)malloc(sizeof(mi_pty));
+ if (!res)
+    return NULL;
+ res->slave=strdup(slave);
+ res->master=master;
+ return res;
+}
+
+void mi_free_pty(mi_pty *p)
+{
+ if (!p)
+    return;
+ free(p->slave);
+ free(p);
+}
+
+/**[txh]********************************************************************
+
+  Description:
+  Closes the pseudo termial master and releases the allocated memory.
+  
+***************************************************************************/
+
+void gmi_end_pty(mi_pty *p)
+{
+ if (!p)
+    return;
+ close(p->master);
+ mi_free_pty(p);
+}