UNIX AND POSIX APIs APIs – a set of application programming

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Presentation transcript:

UNIX AND POSIX APIs APIs – a set of application programming interface functions that can be called by user’s programs to perform system specific functions

Common functions Determine system configuration and user information File manipulation Process creation and control Interprocess communication Network communication

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 streeror with errno as argument

ERROR STATUS CODE :: MEANING EACCESS :: No access to perform an operation via a API EPERM :: a API was aborted because the calling process doesnot have superuser privilege ENOENT :: an invalid filename was specified to an API BADF :: a API was called with an invalid file descriptor EINTR :: a API excecution was aborted due to signal interruption

EAGAIN :: a API was aborted because system resource it requested was temporarily unavailable ENOMEM :: a API was aborted because it could not allocate dynamic memory EIO :: I/O error occurred in a API excecution EPIPE :: a API attempted to write to a pipe which has no reader

EFAULT :: a API was passed an invalid address in one of its arguments ENOEXEC :: a API could not execute a program via one of the exec API ECHILD :: a process doesnot have any child process which it can wait on