The errno.h header file of the C Standard Library defines the integer variable errno, which is set by system calls and some library functions in the event of an error to indicate what went wrong. This macro expands to a modifiable lvalue of type int, therefore it can be both read and modified by a program.
The errno is set to zero at program startup, and certain functions of the standard C library modify its value to some value different from zero to signal some types of error. You can also modify its value or reset to zero at your convenience.Syntax:
if ( (fp = fopen("/etc/shadow", "r")) )
printf("REPORT: File opened successfully\n");
printf("ERROR: %s\n", strerror(errno));
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