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-rw-r--r--src/stdio/ftrylockfile.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/stdio/ftrylockfile.c b/src/stdio/ftrylockfile.c
new file mode 100644
index 00000000..725b66e7
--- /dev/null
+++ b/src/stdio/ftrylockfile.c
@@ -0,0 +1,18 @@
+#include "stdio_impl.h"
+#include "pthread_impl.h"
+
+int ftrylockfile(FILE *f)
+{
+ libc.lockfile = __lockfile;
+ if (f->owner && f->owner == pthread_self()->tid) {
+ if (f->lockcount == INT_MAX)
+ return -1;
+ f->lockcount++;
+ return 0;
+ }
+ if (a_swap(&f->lock, 1))
+ return -1;
+ f->owner = pthread_self()->tid;
+ f->lockcount = 1;
+ return 0;
+}