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.TH open_excl 3
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.SH NAME
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open_excl \- open a file for exclusive writing
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.SH SYNTAX
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.B #include <open.h>
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int \fBopen_excl\fP(const char *\fIfilename\fR);
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.SH DESCRIPTION
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open_excl opens the file \fIfilename\fR for writing and returns the file
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handle. The file may not exist before the call to \fBopen_excl\fR. The
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file will be created with mode 0600.
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If there was an error creating the file, open_excl returns -1
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and sets errno accordingly.
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Since open_excl relies on the O_EXCL flag to open, it does not work
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reliably over NFS (the NFS protocol is broken) and must be emulated
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using a lock file (create a file with a unique file name and link(2) it
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to the lock file. Then stat the lock file and see if the link count is
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2).
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.SH "SEE ALSO"
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open(2)
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