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FILE * fptr = fopen(file_name, "w");
if (!fptr) {
/* Handle Error */
}
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Compliant Solution 1
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The ISO/IEC 9899-1999 C standard does not provide a mechanism to determine if an existing file has been opened or a new file has been created. However, the {{open()}} function as defined in the Open Group Base Specifications Issue 6 \[[Open Group 04|AA. C References#Open Group 04]\] is available on many platforms and provides such a mechanism. If the {{O_CREAT}} and {{O_EXCL}} flags are used together, the {{open()}} function fails when the file specified by {{file_name}} already exists. |
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int fd = open(file_name, O_CREAT | O_EXCL | O_WRONLY, new_file_mode);
if (fd == -1) {
/* Handle Error */
}
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Compliant Solution 2
Priority: Level:
The ability to determine if an existing file has been opened, or a new file has been created provides greater assurance that the file accessed is the one that was intended.
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