add degetc

CMakeLists.txt

@@ -45,6 +45,10 @@ target_link_libraries(ensock common-preeny dl)
 add_library(writeout SHARED src/writeout.c)
 target_link_libraries(writeout common-preeny dl)
 
+# De-getc
+add_library(degetc SHARED src/degetc.c)
+target_link_libraries(degetc common-preeny)
+
 # Random
 add_library(desrand SHARED src/desrand.c)
 target_link_libraries(desrand common-preeny dl)

README.md

@@ -18,6 +18,7 @@ Preeny has the following modules:
 | desrand | Does tricky things with srand() to control randomness. |
 | detime | Makes time() always return the same value. |
 | desleep | Makes sleep() and usleep() do nothing. |
+| degetc | Makes getc() always return '\0' |
 | mallocwatch | When ltrace is inconvenient, mallocwatch provides info on heap operations. |
 | writeout | Some binaries write() to fd 0, expecting it to be a two-way socket. This makes that work (by redirecting to fd 1). |
 | patch | Patches programs at load time. |

src/degetc.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include "logging.h"
+
+int getc(FILE *stream) {
+    preeny_info("getc blocked\n");
+    return '\0';
+}