SIGTERM, SIGSEGV, SIGINT, SIGILL, SIGABRT, SIGFPE

Defined in header `<signal.h>`
#define SIGTERM /implementation defined/
#define SIGSEGV /implementation defined/
#define SIGINT /implementation defined/
#define SIGILL /implementation defined/
#define SIGABRT /implementation defined/
#define SIGFPE /implementation defined/

Each of the above macro constants expands to an integer constant expression with distinct values, which represent different signals sent to the program.

Constant	Explanation
`SIGTERM`	termination request, sent to the program
`SIGSEGV`	invalid memory access (segmentation fault)
`SIGINT`	external interrupt, usually initiated by the user
`SIGILL`	invalid program image, such as invalid instruction
`SIGABRT`	abnormal termination condition, as is e.g. initiated by `abort()`
`SIGFPE`	erroneous arithmetic operation such as divide by zero

References

C17 standard (ISO/IEC 9899:2018):

7.14/3 Signal handling <signal.h> (p: 193)

C11 standard (ISO/IEC 9899:2011):

7.14/3 Signal handling <signal.h> (p: 265)

C99 standard (ISO/IEC 9899:1999):

7.14/3 Signal handling <signal.h> (p: 246)

C89/C90 standard (ISO/IEC 9899:1990):

4.7 SIGNAL HANDLING <signal.h>

See also

signal	sets a signal handler for particular signal (function)
raise	runs the signal handler for particular signal (function)
C++ documentation for signal types

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