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Care should be observed when using {{O_EXCL}} with remote file systems as it does not work with NFS version 2. NFS version 3 added support for {{O_EXCL}} mode in {{open()}}; see. IETF RFC 1813, indefines particular the {{EXCLUSIVE}} value to the {{mode}} argument of {{CREATE}} \[[Callaghan 95|AA. C References#Callaghan 95]\]. |
EXCLUSIVE specifies that the server is to follow exclusive creation semantics, using the verifier to ensure exclusive creation of the target. No attributes may be provided in this case, since the server may use the target file metadata to store the createverf3 verifier.
Compliant Solution: fopen() (GNU)
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For code that operates on {{FILE}} pointers and not file descriptors, the POSIX {{fdopen()}} function \[[Open Group 04|AA. C References#Open Group 05]\] can be used to associate an open stream with the file descriptor returned by {{open()}}, as shown in this compliant solution \[[Open Group 04|AA. C References#Open Group 05]\]. |
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char *file_name;
int new_file_mode;
FILE *fp;
int fd;
/* initialize file_name and new_file_mode */
fd = open(file_name, O_CREAT | O_EXCL | O_WRONLY, new_file_mode);
if (fd == -1) {
/* Handle Error */
}
fp = fdopen(fd, "w");
if (fp == NULL) {
/* Handle Error */
}
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