perlperl
asked on
new file creation
When we use open() call by defaults it creates file with mode 644.
Its because the umask on my system is 0022 (0666 & ~0022 = 0644)
Is there any api in C/C++ by means of which I can create a file with desired mode 744.
I don't want to change umask on my system (and of course I don't want to use chmod).
I am just wondering can we set mode during open call itself?
Its because the umask on my system is 0022 (0666 & ~0022 = 0644)
Is there any api in C/C++ by means of which I can create a file with desired mode 744.
I don't want to change umask on my system (and of course I don't want to use chmod).
I am just wondering can we set mode during open call itself?
ASKER
I don't thinks so I can tell open to create a FILE with mode 755 without changing the umask which I don't want to do.
I know with dir we can do something like but again this depends on what the value of umask is: example in this it will create dir with mode 0644 & ~0022 = 0644
if (mkdir(argv[1], 0644) == -1) {
perror(argv[0]);
exit(EXIT_FAILURE);
}
There is no way I can create dir with mode 777 using mkdir without changing umask
I know with dir we can do something like but again this depends on what the value of umask is: example in this it will create dir with mode 0644 & ~0022 = 0644
if (mkdir(argv[1], 0644) == -1) {
perror(argv[0]);
exit(EXIT_FAILURE);
}
There is no way I can create dir with mode 777 using mkdir without changing umask
You can always use 'mknod()' (http://man7.org/linux/man-pages/man2/mknod.2.html), e.g.
mknod("textfile", S_IFREG | 0644, 0);ASKER CERTIFIED SOLUTION
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Um, gplana alread mentioned that, so you are basically accepting an answer that as been posted three days earlier. Why?
jkr, perlperl's response to gplana's comment was:
because of that you posted an alternative code sample using mknod and I posted a simpler code sample where the open was used. it obviously is an acceptable solution though gplana's comment of course would have deserved a better recognition.
you may reopen the question such that perlperl can make a new decision.
Sara
I don't thinks so I can tell open to create a FILE with mode 755 without changing the umask which I don't want to do.
because of that you posted an alternative code sample using mknod and I posted a simpler code sample where the open was used. it obviously is an acceptable solution though gplana's comment of course would have deserved a better recognition.
you may reopen the question such that perlperl can make a new decision.
Sara
Please take a look at this link: http://www.gnu.org/software/libc/manual/html_node/Setting-Permissions.html