add ppr_process_readable

.clang-format

@@ -0,0 +1,24 @@
+---
+UseTab: Always
+TabWidth: 8
+AlignConsecutiveAssignments:
+  Enabled: true
+AlignConsecutiveDeclarations:
+  Enabled: true
+AccessModifierOffset: -4
+NamespaceIndentation: All
+IndentWidth: 8
+PointerAlignment: Left
+ColumnLimit: 0
+AllowShortIfStatementsOnASingleLine: Always
+AllowShortBlocksOnASingleLine: Never
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortLoopsOnASingleLine: true
+BreakBeforeBraces: Custom
+BraceWrapping:
+	AfterCaseLabel: true
+SpaceBeforeParens: Never
+AlignEscapedNewlines: DontAlign
+SortIncludes: false
+AllowShortEnumsOnASingleLine: false
+#IndentPPDirectives: AfterHash

include/ppr_base.h

@@ -210,6 +210,7 @@ void* ppr_process_create(const char* exec, char** env);
 void  ppr_process_close(void* handle);
 int   ppr_process_write(void* handle, const void* data, int len);
 int   ppr_process_read(void* handle, void* data, int len);
+int   ppr_process_readable(void* handle);
 void  ppr_process_destroy(void* handle);
 
 /* dirent.c */

src/base/process.c

@@ -245,6 +245,29 @@ int ppr_process_read(void* handle, void* data, int len) {
 #endif
 }
 
+int ppr_process_readable(void* handle) {
+	process_t* proc = handle;
+#if defined(PPR_IS_WIN32)
+	DWORD avail;
+
+	if(!PeekNamedPipe(proc->h_stdout, NULL, 0, NULL, &avail, NULL)) return 0;
+
+	return (avail > 0) ? 1 : 0;
+#elif defined(FPR_IS_UNIX)
+	struct ppr_pollfd pfd;
+	int		  n;
+
+	pfd.fd	   = proc->fd_stdout;
+	pfd.events = FPR_POLLIN | FPR_POLLPRI;
+
+	if((n = ppr_poll(&pfd, 1, 0)) < 0) return 0;
+
+	return (n > 0) ? 1 : 0;
+#else
+	return 0;
+#endif
+}
+
 void ppr_process_destroy(void* handle) {
 	process_t* proc = handle;
 #if defined(PPR_IS_WIN32)