The C and C++ Include Header Files
/usr/include/x86_64-linux-gnu/bits/types/sigval_t.h
$ cat -n /usr/include/x86_64-linux-gnu/bits/types/sigval_t.h 1 #ifndef __sigval_t_defined 2 #define __sigval_t_defined 3 4 #include
5 6 /* To avoid sigval_t (not a standard type name) having C++ name 7 mangling depending on whether the selected standard includes union 8 sigval, it should not be defined at all when using a standard for 9 which the sigval name is not reserved; in that case, headers should 10 not include
and should use only the 11 internal __sigval_t name. */ 12 #ifndef __USE_POSIX199309 13 # error "sigval_t defined for standard not including union sigval" 14 #endif 15 16 typedef __sigval_t sigval_t; 17 18 #endif
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