Add a README.cygwin detailing Cygwin specific build/install instructions

[lttng-ust.git] / liblttng-ust-fork / ustfork.c

diff --git a/liblttng-ust-fork/ustfork.c b/liblttng-ust-fork/ustfork.c
index 8fade56e84c5413bd30c679d7f3fd5c30b4e3c70..33b3894ad467e10ef743545929ee11a03cf8cdfb 100644 (file)
--- a/liblttng-ust-fork/ustfork.c
+++ b/liblttng-ust-fork/ustfork.c
@@ -54,6 +54,34 @@ pid_t fork(void)
        return retval;
 }
 
+int daemon(int nochdir, int noclose)
+{
+       static int (*plibc_func)(int nochdir, int noclose) = NULL;
+       sigset_t sigset;
+       int retval;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "daemon");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"daemon\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       ust_before_fork(&sigset);
+       /* Do the real daemon call */
+       retval = plibc_func(nochdir, noclose);
+       if (retval == 0) {
+               /* child, parent called _exit() directly */
+               ust_after_fork_child(&sigset);
+       } else {
+               /* on error in the parent */
+               ust_after_fork_parent(&sigset);
+       }
+       return retval;
+}
+
 #ifdef __linux__
 
 struct user_desc;
@@ -109,7 +137,7 @@ int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ...)
                                tls, ctid);
        } else {
                /* Creating a real process, we need to intervene. */
-               struct ustfork_clone_info info = { fn: fn, arg: arg };
+               struct ustfork_clone_info info = { .fn = fn, .arg = arg };
 
                ust_before_fork(&info.sigset);
                retval = plibc_func(clone_fn, child_stack, flags, &info,