Hook perror(3).

[coloredstderr/coloredstderr.git] / src / coloredstderr.c

diff --git a/src/coloredstderr.c b/src/coloredstderr.c
index 3e5dac2c770ca1f44481529911effab60a7b092c..b16633f8534b8b7d9a1e4fdc64532a185497c598 100644 (file)
--- a/src/coloredstderr.c
+++ b/src/coloredstderr.c
@@ -42,6 +42,8 @@ static size_t (*real_fwrite)(const void *, size_t, size_t, FILE *);
 /* Did we already (try to) parse the environment and setup the necessary
  * variables? */
 static int initialized;
+/* Force hooked writes even when not writing to a tty. Used for tests. */
+static int force_write_to_non_tty;
 
 
 #include "constants.h"
@@ -56,16 +58,17 @@ static int initialized;
 
 /* Should the "action" handler be invoked for this file descriptor? */
 static int check_handle_fd(int fd) {
-    /* Never touch anything not going to a terminal. */
-    if (!isatty(fd)) {
-        return 0;
-    }
-
     /* Load state from environment. Only necessary once per process. */
     if (!initialized) {
         init_from_environment();
     }
 
+    /* Never touch anything not going to a terminal - unless we are explicitly
+     * asked to do so. */
+    if (!force_write_to_non_tty && !isatty(fd)) {
+        return 0;
+    }
+
     if (tracked_fds_count == 0) {
         return 0;
     }
@@ -227,6 +230,10 @@ HOOK_FILE1(int, putchar_unlocked, stdout,
 HOOK_FILE1(int, puts_unlocked, stdout,
            const char *, s)
 
+/* perror(3) */
+HOOK_VOID1(void, perror, STDERR_FILENO,
+           const char *, s)
+
 
 /* Hook functions which duplicate file descriptors to track them. */