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errno
Most of the C or even Unix function calls return -1 or NULL in case of any error and set an error code:
A value of 0
indicates that there is no error in the program.
perror()
displays the string you pass to it, followed by a colon, a space, and then the textual representation of the current errno value.
strerror()
returns a pointer to the textual representation of the current errno value.
