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22 lines
759 B
22 lines
759 B
.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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extern 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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