perror
From cppreference.com
| Defined in header <stdio.h>
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| void perror( const char *s ); |
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Prints to stderr the contents of the null-terminated character string pointed to by s (unless s is a null pointer), followed by the two characters ": ", followed by the implementation-defined error message describing the error code currently stored in the system variable errno (identical to the output of strerror(errno)), followed by '\n'.
Parameters
| s | - | pointer to a null-terminated string with explanatory message |
Return value
(none)