usdumpsema - dump out information about a specific semaphore
int usdumpsema (usema_t *sema, FILE *fd, const char *str);
usdumpsema dumps information about sema in a readable form. This
information is written to the file descriptor given by fd. The
information printed includes where in memory the semaphore resides, what
its count is, and the metering and debugging information (see
usctlsema(3P)). The argument str is simply printed as a string, and can
be used to aid in identifying where usdumpsema was called from.
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
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