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Full Discussion: Umask permission
Operating Systems Solaris Umask permission Post 303030566 by bakunin on Tuesday 12th of February 2019 08:14:50 PM
Old 02-12-2019
Quote:
Originally Posted by AbuAliiiiiiiiii
Note:
• When I create the file by user manually using touch command created with correct permission.
• Application using the same user When the file created by application created by different permission.

Please advise why this is happening.
From your comment i take it you are aware that the umask setting is not the filemode itself but rather the complement to it.

Since you didn't tell us anything about the environment (application, the way it is called, ...) there could be one of several reasons which i can only speculate about:

1) the application might be built that way. The way you can change filemodes (with chmod) to override umasks default the application can do the same. See the fopen() system call.

2) the application might change effective UID/GID. Some applications (i.e. Apache) do this.

3) if the application is called by a script maybe the script itself calls the application with a new user like in su - otheruser -c application

4) the directory the application creates files in may have one or more sticky bits set so that files are created with different ownerships and/or permissions

I hope this helps.

bakunin
 

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LEARN ABOUT NETBSD

umask

UMASK(2)						      BSD System Calls Manual							  UMASK(2)

NAME

     umask -- set file creation mode mask

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/stat.h>

     mode_t
     umask(mode_t numask);

DESCRIPTION

     The umask() routine sets the process's file mode creation mask to numask and returns the previous value of the mask.  The 9 low-order access
     permission bits of numask are used by system calls, including open(2), mkdir(2), mkfifo(2) and mknod(2) to turn off corresponding bits
     requested in file mode.  (See chmod(2)).  This clearing allows each user to restrict the default access to his files.

     The default mask value is S_IWGRP|S_IWOTH (022, write access for the owner only).	Child processes inherit the mask of the calling process.

RETURN VALUES

     The previous value of the file mode mask is returned by the call.

ERRORS

     The umask() function is always successful.

SEE ALSO

     chmod(2), mkdir(2), mkfifo(2), mknod(2), open(2)

STANDARDS

     The umask() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

BSD
								   June 4, 1993 							       BSD
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