diff --git a/.gitignore b/.gitignore
index 0148b42..bab1c5a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,8 @@
/tests/Makefile.in
/tests/example
/tests/example.o
+/tests/example_vfork
+/tests/example_vfork.o
/tests/run.sh.log
/tests/run.sh.trs
/tests/test-suite.log
diff --git a/src/coloredstderr.c b/src/coloredstderr.c
index b16633f..9ade423 100644
--- a/src/coloredstderr.c
+++ b/src/coloredstderr.c
@@ -326,3 +326,21 @@ int fclose(FILE *fp) {
close_fd(fileno(fp));
return real_fclose(fp);
}
+
+
+/* Hook functions which are necessary for correct tracking. */
+
+pid_t vfork(void) {
+ /* vfork() is similar to fork() but the address space is shared between
+ * father and child. It's designed for fork()/exec() usage because it's
+ * faster than fork(). However according to the POSIX standard the "child"
+ * isn't allowed to perform any memory-modifications before the exec()
+ * (except the pid_t result variable of vfork()).
+ *
+ * As some programs don't adhere to the standard (e.g. the "child" closes
+ * or dups a descriptor before the exec()) and this breaks our tracking of
+ * file descriptors (e.g. it gets closed in the parent as well), we just
+ * fork() instead. This is in compliance with the POSIX standard and as
+ * most systems use copy-on-write anyway not a performance issue. */
+ return fork();
+}
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9928cdc..bfaaea2 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,9 +1,11 @@
TESTS = run.sh
-check_PROGRAMS = example
+check_PROGRAMS = example example_vfork
example_SOURCES = example.c
+example_vfork_SOURCES = example_vfork.c
dist_check_SCRIPTS = run.sh lib.sh
dist_check_DATA = example.expected \
+ example_vfork.expected \
example-noforce.sh \
example-noforce.sh.expected \
example-redirects.sh \
diff --git a/tests/example_vfork.c b/tests/example_vfork.c
new file mode 100644
index 0000000..35ceaf4
--- /dev/null
+++ b/tests/example_vfork.c
@@ -0,0 +1,43 @@
+/*
+ * Test issues with vfork().
+ *
+ * Copyright (C) 2013 Simon Ruderich
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#include
+#include
+#include
+
+int main(int argc, char **argv) {
+ pid_t pid;
+
+ fprintf(stderr, "Before vfork().\n");
+
+ pid = vfork();
+ if (pid == 0) {
+ /* This violates the POSIX standard! The "child" is only allowed to
+ * modify the result of vfork(), e.g. the pid variable. Some programs
+ * (e.g. gdb) do it anyway so we have to workaround it. */
+ dup2(STDOUT_FILENO, STDERR_FILENO);
+
+ _exit(2);
+ }
+
+ fprintf(stderr, "After vfork().\n");
+ puts("");
+
+ return EXIT_SUCCESS;
+}
diff --git a/tests/example_vfork.expected b/tests/example_vfork.expected
new file mode 100644
index 0000000..0be6ad8
--- /dev/null
+++ b/tests/example_vfork.expected
@@ -0,0 +1,3 @@
+>stderr>Before vfork().
+stderr>After vfork().
+