fgetc_unlocked - Linux

Overview

The fgetc_unlocked function provides a thread-safe way to read a single character from a stream without locking the stream. The function is typically used in multithreaded programs to allow multiple threads to access the same stream concurrently.

Syntax

int fgetc_unlocked(FILE *stream);

Options/Flags

None.

Examples

#include <stdio.h>

int main() {
  FILE *stream = fopen("myfile.txt", "r");
  if (stream == NULL) {
    perror("fopen");
    return 1;
  }

  int c;
  while ((c = fgetc_unlocked(stream)) != EOF) {
    putchar(c);
  }

  fclose(stream);
  return 0;
}

In this example, the fgetc_unlocked function is used to read characters from the file "myfile.txt" one character at a time. The characters are then printed to the standard output.

Common Issues

One common issue that can occur when using fgetc_unlocked is that the stream may become corrupted if multiple threads attempt to access the same stream simultaneously. To avoid this problem, it is important to use a locking mechanism, such as a mutex, to control access to the stream.

Integration

The fgetc_unlocked function can be used with other Linux commands and tools that operate on streams. For example, the fgetc_unlocked function can be used to read characters from a pipe or from a socket.

Related Commands