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/usr/lib/bcc/include/bsd/signal.h is in elks-libc 0.16.17-3.2.

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#ifndef _BSD_SIGNAL_H
#define _BSD_SIGNAL_H

/* make sure we get BSD style signals (that don't need to be reset) */

#define __USE_BSD_SIGNAL
#include_next <signal.h>

/* use rough approximation of sigaction to sigvec, not completely safe! */

#define sigvec		sigaction
#define sv_mask		sa_mask
#define sv_flags	sa_flags
#define sv_handler	sa_handler
#define sv_onstack	sa_mask /* ouch, this one really hurts */

/* BSD uses some non-POSIX signals without ifdefs */

#define SIGSYS		SIGUNUSED

/* BSD wants this typedef for signal handlers */

#define sig_t		__sighandler_t 

#endif /* _BSD_SIGNAL_H */