forked from Lainports/freebsd-ports
adfb495a5b
It can be used to write mail messages to a qmail-style maildir, or to write data to a "spool" directory reliably.
45 lines
950 B
Text
45 lines
950 B
Text
--- safecat.1 2000/11/21 08:57:15 1.1.1.1
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+++ safecat.1 2000/11/21 10:25:44 1.2
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@@ -80,9 +80,9 @@
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and
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.IR destdir ,
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and exits unless both directories exist and are writable.
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-Second, it
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-.B stat()s
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-the name
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+Second, it attempts to
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+.B open()
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+exclusively the file
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.BR tempdir/\fItime.pid.host ,
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where
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.I time
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@@ -91,22 +91,21 @@
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is the program's process ID,
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and
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.I host
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-is the host name.
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+is the host name. The exclusive
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+.B open()
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+will fail if the file already exists.
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Third, if
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-.B stat()
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-returned anything other than ENOENT,
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+.B open()
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+returned EEXIST (the file already exists),
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the program sleeps for two seconds, updates
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.IR time ,
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and tries the
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-.B stat()
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+.B open()
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again, a limited number of times.
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Fourth, the program
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-creates
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-.BR tempdir/\fItime.pid.host .
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-Fifth, the program
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.I NFS-writes
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the message to the file.
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-Sixth, the program
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+Fifth, the program
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.BR link() s
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the file to
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.BR destdir/\fItime.pid.host .
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