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34 // We can't use the OpenBSD implementation which uses kernel-specific
35 // APIs not available on Linux. Instead we use a pthread_mutex_t within
36 // struct __sfileext (see fileext.h).
38 void flockfile(FILE* fp) {
44 pthread_mutex_lock(&_FLOCK(fp));
48 int ftrylockfile(FILE* fp) {
53 // The specification for ftrylockfile() says it returns 0 on success,
54 // or non-zero on error. So return an errno code directly on error.
59 return pthread_mutex_trylock(&_FLOCK(fp));
62 void funlockfile(FILE* fp) {
68 pthread_mutex_unlock(&_FLOCK(fp));