/usr/include/ivstd/signal.h is in ivtools-dev 1.2.11a1-11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #ifndef ivtools_signal_h
#define ivtools_signal_h
#if defined(__cplusplus)
#if __linux
#undef __need_sig_atomic_t
#undef __need_sigset_t
#endif
#include_next <signal.h>
#undef NULL
#define NULL 0
#else
#include </usr/include/signal.h>
#endif
#endif
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