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document error signalling through (void*)0 return code.
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@ -16,5 +16,7 @@ will not be written to disk.
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The file is unmapped by the operating system if the process terminates.
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It can also be manually unmapped by calling \fBmunmap\fR from
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<sys/mman.h>.
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If the file could not be opened or mapped, (void*)0 is returned.
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.SH "SEE ALSO"
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munmap(2)
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@ -13,5 +13,7 @@ and returns a pointer to the mapped file.
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The file is unmapped by the operating system if the process terminates.
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It can also be manually unmapped by calling \fBmunmap\fR from
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<sys/mman.h>.
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If the file could not be opened or mapped, (void*)0 is returned.
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.SH "SEE ALSO"
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munmap(2)
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@ -20,5 +20,7 @@ It can also be manually unmapped by calling \fBmunmap\fR from
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To write changes to disk immediately, you can use msync from
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<sys/mman.h>.
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If the file could not be opened or mapped, (void*)0 is returned.
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.SH "SEE ALSO"
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munmap(2), msync(2)
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