API and its common characteristics
Answer:
APIs – a set of application programming interface
functions(commonly known as System calls) that can be called by user’s programs
to perform system-specific functions.
API COMMON CHARACTERISTICS
• API return -1 to indicate the execution has failed
• Global variable errno is set with an error code
• Perror function prints diagnostic message of the error to
the standard output or calls strerror with errno as an argument.
Common functions
• Determine system configuration and user information
• File manipulation
• Process creation and control
• Interprocess communication
• Network communication
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