What system call would you use to write to a file descriptor? (select all correct answers)writeprintffprintf

Answer Breakdown

To write to a file descriptor in C programming, the specific system call that is used is write(). The other options, printf() and fprintf(), are not system calls; they are standard library functions that ultimately depend on system calls for output.

1. write: This is a direct system call that writes data to a file descriptor. It is used as follows:

   ssize_t write(int fd, const void *buf, size_t count);
   

   • fd: The file descriptor where the data should be written.
   • buf: The buffer containing the data to write.
   • count: The number of bytes to write.

2. printf: This is a standard library function used for formatted output to stdout. It does not directly write to a file descriptor.

3. fprintf: Similar to printf, this function is used for formatted output to a specified file stream (including file descriptors), but it is not a system call. It provides higher-level abstraction over the system calls.

Final Answer

The correct answer is: write.