### 7.1 `psignal`—print a signal message on standard error

Synopsis

         #include <stdio.h>
         void psignal(int signal, const char *prefix);

Description
Use `psignal` to print (on standard error) a signal message corresponding to the value of the signal number signal. Unless you use `NULL` as the value of the argument prefix, the signal message will begin with the string at prefix, followed by a colon and a space (`:` ). The remainder of the signal message is one of the strings described for `strsignal`.

Returns
`psignal` returns no result.

Portability
POSIX.1-2008 requires `psignal`, but the strings issued vary from one implementation to another.

Supporting OS subroutines required: `close`, `fstat`, `isatty`, `lseek`, `read`, `sbrk`, `write`.