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I am reading a bug fix in an OpenSource project. There was a fix related with enabling larger shared memory region. I don't understand this fix here. Could anyone explain what's the difference between those two statements? 

Old: if (-1 == (buf->id = open(buf->seg_name, O_CREAT | O_RDWR, 0600))) { New: if (-1 == (buf->id = open(buf->seg_name, O_RDWR))) {

Thanks!

Please let me know if you need more info.

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    What has become of the fine art of reading the open(2) manual page? Commented Oct 24, 2014 at 21:50

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The new code will insist on the file named by buff->seg_name to exist, while the old code (attempts to) create it with permission 0600 if it doesn't.

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