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(libc.info)Error Reporting

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Error Reporting
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   Many functions in the GNU C library detect and report error
conditions, and sometimes your programs need to check for these error
conditions.  For example, when you open an input file, you should
verify that the file was actually opened correctly, and print an error
message or take other appropriate action if the call to the library
function failed.

   This chapter describes how the error reporting facility works.  Your
program should include the header file `errno.h' to use this facility.

Checking for Errors

How errors are reported by library functions.

Error Codes

Error code macros; all of these expand

into integer constant values.

Error Messages

Mapping error codes onto error messages.