Recoding the `ping` command provides you a deeper comprehension of how network tools work, Especially TCP/IP communication between two machines on a network, leading to a more profound understanding of network operations.
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Allowed function
| Function | Description |
|---|---|
| gettimeofday | Retrieves the current time with microsecond precision. Useful for timestamping packets and measuring network latency. |
| exit | Terminates the program immediately. Useful for handling exit conditions or errors gracefully. |
| inet_ntop / inet_pton | Converts IP addresses between human-readable and network binary formats. Essential for handling IP addresses in networking applications. |
| nthos / htons: | Converts between host byte order and network byte order for 16-bit integers. Ensures consistency in data representation across different systems. |
| signal / alarm / usleep | Manages signal handling, timers, and microsecond-level sleep. Useful for implementing timeouts and asynchronous behavior in networking code. |
| socket / setsockopt / close | Creates, configures, and closes network sockets. Essential functions for establishing and managing network connections. |
| sendto / recvmsg | Sends data to a specific address and receives data along with sender information. Core functions for sending and receiving network packets. |
| getpid / getuid | Retrieves the process ID and user ID of the current process. Useful for identifying the running process and implementing security checks. |
| getaddrinfo / getnameinfo / freeaddrinfo | Resolves domain names to IP addresses and vice versa. Also frees memory allocated by getaddrinfo. Essential for DNS resolution in networking applications. |
| strerror / gai_strerror | Converts error codes to human-readable error messages. Useful for diagnosing errors encountered during socket operations and network communication. |
| printf and its family | Outputs formatted text to the console. Useful for displaying information, debugging, and monitoring the program's behavior. |