Talk:Append a record to the end of a text file: Difference between revisions
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(Improvement needed/notes on append portability) |
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: Still needs some work IMO; it's got lots of small bits and pieces jumbled together without quite a coherent story. It's probably not that hard to improve it to the point of being good though. |
: Still needs some work IMO; it's got lots of small bits and pieces jumbled together without quite a coherent story. It's probably not that hard to improve it to the point of being good though. |
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: And as a side note, POSIX systems have the O_APPEND flag to the open() syscall which makes this trivial (if it is exposed by the language) provided appropriate flushing is used. (Even better, the flag is inheritable by subprocesses; that's a ''very'' useful thing at times.) By contrast, on Windows you need to lock the file to do this safely and that's error prone and much more complex in practice. Moreover, locks aren't inheritable (of course). Damn, but I wish the folks at Redmond actually ''understood all'' of POSIX properly, as it has some really wonderful things in there. –[[User:Dkf|Donal Fellows]] 13:58, 12 September 2011 (UTC) |
: And as a side note, POSIX systems have the O_APPEND flag to the open() syscall which makes this trivial (if it is exposed by the language) provided appropriate flushing is used. (Even better, the flag is inheritable by subprocesses; that's a ''very'' useful thing at times.) By contrast, on Windows you need to lock the file to do this safely and that's error prone and much more complex in practice. Moreover, locks aren't inheritable (of course). Damn, but I wish the folks at Redmond actually ''understood all'' of POSIX properly, as it has some really wonderful things in there. –[[User:Dkf|Donal Fellows]] 13:58, 12 September 2011 (UTC) |
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== CSV? == |
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Is it supposed to be a CSV file? The description doesn't say anything about the file format, unless "passwd" implies some sort of format. Maybe the given records should be specified in the description. --[[User:Mwn3d|Mwn3d]] 23:57, 12 September 2011 (UTC) |
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Revision as of 23:57, 12 September 2011
Rationale
Basically I was looking for an example of appending an actual record to a file and found no such task.
- Still needs some work IMO; it's got lots of small bits and pieces jumbled together without quite a coherent story. It's probably not that hard to improve it to the point of being good though.
- And as a side note, POSIX systems have the O_APPEND flag to the open() syscall which makes this trivial (if it is exposed by the language) provided appropriate flushing is used. (Even better, the flag is inheritable by subprocesses; that's a very useful thing at times.) By contrast, on Windows you need to lock the file to do this safely and that's error prone and much more complex in practice. Moreover, locks aren't inheritable (of course). Damn, but I wish the folks at Redmond actually understood all of POSIX properly, as it has some really wonderful things in there. –Donal Fellows 13:58, 12 September 2011 (UTC)
CSV?
Is it supposed to be a CSV file? The description doesn't say anything about the file format, unless "passwd" implies some sort of format. Maybe the given records should be specified in the description. --Mwn3d 23:57, 12 September 2011 (UTC)