You think, if S_IRUSR works when file create, then the file is always empty and read only, it has no sense. Even S_ISUSR is read only, but in fact still return read/write permission, the final permission depends on the flags, if the flag is O_WRONLY, it can only write when create, if the flag is O_RDONLY, it can only read when create.įd = open("xxx", O_CREAT|O_WRONLY, S_IRUSR) Īnd result is expected, at first time, when file create, if has write permission and has no read permission, after first time, it open failed:Īnd I can understand why they design the mode parameter only work after first time. It means S_ISUSR only works after first time. Note that this mode applies only to future accesses of the newly created file the open() call that creates a read-only file may well return a read/write file descriptor. Then let us face the more important question, why S_ISUSR doens't work at first time. In fact, if use your code, ran after first time, it is not couldn't be written to, it is not be open. Of cource, when I ran executable after first time, it worked like I expect when it could't be written to. Then execute the program whenever, it will always says "write failed", and "xxx" is empty. Codes are following: #include įd = open("xxx", O_CREAT|O_RDONLY, S_IRUSR) you can just remove O_WRONLY and O_APPEND flag, and add O_RDONLY flag or not. I will explain why it doesn't work at first time.Īt first let us resolve your question. Printf("The File %s\t is not an Executable\n",fileName) Īnd the output says: The File test.sh Found Printf("The File %s\t is an Executable\n",fileName) Printf("The File %s\t it cannot be Edited\n",fileName) Printf("The File %s\t it can be Edited\n",fileName) Printf("The File %s\t cannot be read\n",fileName) Printf("The File %s\t can be read\n",fileName) Printf("The File %s\t not Found\n",fileName) ![]() To export /data/shared you have to add the following at the end of the file: data comment shared path /data/shared guest ok. Printf("The File %s\t Found\n",fileName) To allow everyone from the group SAMBASHARE to access the shares add the following to the global directive: create mode 664 workgroup SAMBASHARE security user usershare allow guests yes. I tried doing a chmod and chgrp but that didn't seem to have any impact.Fd=open("test.sh",O_CREAT|O_APPEND,S_IRUSR) Īnd if you try to write that file, you will get: Īnyway, on my Linux machine if I wanna check that file, I will do it like this: #include If I open my samba share as root then I can write to the folders. Permissions when viewed from ubuntu desktop "drwxr-xr-x 0 root root" Permissions on the server when viewed from the server "drwxrwxrwx 4 Craig Craig"
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