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On POSIX compliant systems the permissions may be restricted by the value of the POSIX umask() function Open Group 04.
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The operating system modifies the access permissions by computing the intersection of the inverse of the umask and the permissions requested by the process \[[Viega 03||AA. C References#Viega 03]\]. For example, if the variable {{requested_permissions}} contained the permissions passed to the operating system to create a new file, the variable {{actual_permissions}} would be the actual permissions that the operating system would use to create the file: |
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requested_permissions = 0666;
actual_permissions = requested_permissions & ~umask();
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For Linux operating systems, any created files will have mode S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH (0666), as modified by the process' umask value (see fopen(3)).
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