SEI CERT C Coding Standard

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Old Version 5

changes.mady.by.user Shaun Hedrick

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New Version 6

changes.mady.by.user Hal Burch

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Comment: check for fopen errors

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Code Block
bgColor#ffcccc
/* some device used for both input and output */ 
char const *filename = "/dev/device2";

FILE *file = fopen(filename, "rb+");
if (file == NULL) {
  /* handle error */
}

/* write to file stream */
/* read response from file stream */
fclose(file);

However, the output buffer is not flushed before receiving input back from the stream, so the data may not have actually been sent, resulting in unexpected behavior.

...

Code Block
bgColor#ccccff
/* some device used for both input and output */ 
char const *filename = "/dev/device2";

FILE *file = fopen(filename, "rb+");
if (file == NULL) {
  /* handle error */
]

/* write to file stream */
fflush(file);
/* read response from file stream */
fclose(file);

This ensures that all data has been cleared from the buffer before continuing.

...