Added PR_ProcessAttrSetCurrentDirectory to allow setting the current

working directory of the new process.  PR_SetStdioRedirect is renamed
PR_ProcessAttrSetStdioRedirect.  The old name is retained but moved
to obsolete/probslet.h.  This work is contributed by Ben Laurie
<ben@algroup.co.ul>.
Files changed: prproces.h, probslet.h, primpl.h, uxproces.c, ntmisc.c,
prinit.c, and parent.c.

nsprpub/pr/include/obsolete/probslet.h

@@ -25,6 +25,7 @@
 #define PROBSLET_H
 
 #include "prio.h"
+#include "prproces.h"
 
 PR_BEGIN_EXTERN_C
 
@@ -218,6 +219,12 @@ PR_EXTERN(PRStatus) PR_GetHostName(char *name, PRUint32 namelen);
 */
 PR_EXTERN(const char *) PR_GetErrorString(void);
 
+PR_EXTERN(void) PR_SetStdioRedirect(
+    PRProcessAttr *attr,
+    PRSpecialFD stdioFd,
+    PRFileDesc *redirectFd
+);
+
 PR_END_EXTERN_C
 
 #endif /* defined(PROBSLET_H) */

nsprpub/pr/include/private/primpl.h

@@ -1371,6 +1371,7 @@ struct PRProcessAttr {
     PRFileDesc *stdinFd;
     PRFileDesc *stdoutFd;
     PRFileDesc *stderrFd;
+    char *currentDirectory;
 };
 
 struct PRProcess {

nsprpub/pr/include/prproces.h

@@ -37,12 +37,17 @@ PR_EXTERN(void) PR_ResetProcessAttr(PRProcessAttr *attr);
 
 PR_EXTERN(void) PR_DestroyProcessAttr(PRProcessAttr *attr);
 
-PR_EXTERN(void) PR_SetStdioRedirect(
+PR_EXTERN(void) PR_ProcessAttrSetStdioRedirect(
     PRProcessAttr *attr,
     PRSpecialFD stdioFd,
     PRFileDesc *redirectFd
 );
 
+PR_EXTERN(PRStatus) PR_ProcessAttrSetCurrentDirectory(
+    PRProcessAttr *attr,
+    const char *dir
+);
+
 /*
 ** Create a new process
 **

nsprpub/pr/src/md/unix/uxproces.c

@@ -169,6 +169,11 @@ ForkAndExec(
                 }
                 close(attr->stderrFd->secret->md.osfd);
             }
+            if (attr->currentDirectory) {
+                if (chdir(attr->currentDirectory) < 0) {
+                    _exit(1);  /* failed */
+                }
+            }
         }
 
         (void)execve(path, argv, envp);

nsprpub/pr/src/md/windows/ntmisc.c

@@ -431,7 +431,7 @@ PRProcess * _PR_CreateWindowsProcess(
                                        * string is in the form:
                                        *     name=value
                                        * XXX: usually NULL */
-                           NULL,  /* current drive and directory */
+                           attr->currentDirectory,  /* current drive and directory */
                            &startupInfo,
                            &procInfo
                           );
@@ -629,7 +629,7 @@ PRInt32 _PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
     {
         mov ecx, val
         mov eax, 1
-        xadd dword ptr [ecx], eax
+        lock xadd dword ptr [ecx], eax
         inc eax
     }
 }
@@ -642,7 +642,7 @@ PRInt32 _PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
     {
         mov ecx, val
         mov eax, 0ffffffffh
-        xadd dword ptr [ecx], eax
+        lock xadd dword ptr [ecx], eax
         dec eax
     }
 }

nsprpub/pr/src/misc/prinit.c

@@ -382,21 +382,22 @@ PR_NewProcessAttr(void)
 PR_IMPLEMENT(void)
 PR_ResetProcessAttr(PRProcessAttr *attr)
 {
+    PR_FREEIF(attr->currentDirectory);
     memset(attr, 0, sizeof(*attr));
 }
 
 PR_IMPLEMENT(void)
 PR_DestroyProcessAttr(PRProcessAttr *attr)
 {
+    PR_FREEIF(attr->currentDirectory);
     PR_DELETE(attr);
 }
 
 PR_IMPLEMENT(void)
-PR_SetStdioRedirect(
+PR_ProcessAttrSetStdioRedirect(
     PRProcessAttr *attr,
     PRSpecialFD stdioFd,
-    PRFileDesc *redirectFd
-)
+    PRFileDesc *redirectFd)
 {
     switch (stdioFd) {
         case PR_StandardInput:
@@ -413,6 +414,40 @@ PR_SetStdioRedirect(
     }
 }
 
+/*
+ * OBSOLETE
+ */
+PR_IMPLEMENT(void)
+PR_SetStdioRedirect(
+    PRProcessAttr *attr,
+    PRSpecialFD stdioFd,
+    PRFileDesc *redirectFd)
+{
+#if defined(DEBUG)
+    static PRBool warn = PR_TRUE;
+    if (warn) {
+        warn = _PR_Obsolete("PR_SetStdioRedirect()",
+                "PR_ProcessAttrSetStdioRedirect()");
+    }
+#endif
+    PR_ProcessAttrSetStdioRedirect(attr, stdioFd, redirectFd);
+}
+
+PR_IMPLEMENT(PRStatus)
+PR_ProcessAttrSetCurrentDirectory(
+    PRProcessAttr *attr,
+    const char *dir)
+{
+    PR_FREEIF(attr->currentDirectory);
+    attr->currentDirectory = PR_MALLOC(strlen(dir) + 1);
+    if (!attr->currentDirectory) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return PR_FAILURE;
+    }
+    strcpy(attr->currentDirectory, dir);
+    return PR_SUCCESS;
+}
+
 PR_IMPLEMENT(PRProcess*) PR_CreateProcess(
     const char *path,
     char *const *argv,

nsprpub/pr/tests/parent.c

@@ -76,10 +76,10 @@ PRIntn main (PRIntn argc, char **argv)
     if (NULL != debug) PR_fprintf(debug, "Forking %s\n", child->name);
 
     child->attr = PR_NewProcessAttr();
-    PR_SetStdioRedirect(
+    PR_ProcessAttrSetStdioRedirect(
         child->attr, PR_StandardOutput,
         PR_GetSpecialFD(PR_StandardOutput));
-    PR_SetStdioRedirect(
+    PR_ProcessAttrSetStdioRedirect(
         child->attr, PR_StandardError,
         PR_GetSpecialFD(PR_StandardError));