Invalid argument according to the post here it means that the device doesnt implement a write method. Creating my first unix serverclient but getting a shmget. Invalid argument means that the write method of the driver returns einval. Below we show a tutorial on how to listen to tetra communications using a rtlsdr rtl2832u software defined radio. Nov 26, 2014 recently, a software program called tetra live monitor telive was released on github.
Notes using shmat with shmaddr equal to null is the preferred, portable way of attaching a shared memory segment. Solved shmat failed invalid argument the freebsd forums. Jun 05, 20 how to calibrate rtlsdr using kalibratertl on linux. When it will be released in the official repos the version will be 3. The caller must have execute permission on the segment. Name top shmat xsi shared memory attach operation synopsis top.
Invalid argument i think it is a problem with ipc resources. Nor would i have had any idea that ftok was involved in any capacity. Error shmat memoria2 22 invalid argument the connection 2 only is ok, if we delete the connection 1 with. The value of the shmflg parameter is either zero or is obtained by performing an. When this limit is reached testcase will continue with next file.
Be aware that the shared memory segment attached in this way may be attached at different addresses in different processes. If you attempt to use shmat with a fixed address, you must ensure that this address is 64kaligned. For information about configuring shared memory properly, refer to. A beginners tutorial containing complete knowledge of unix korn and bourne shell and programming, utilities, file system, directories, memory management, special variables, vi editor, processes. In svid 3 or perhaps earlier the type of the shmaddr argument was changed from char into const void, and. The process must have read permission for the segment. The implementation places no intrinsic perprocess limit on the number of shared memory segments shmseg. The adaptive server installation and configuration guide for your platform and version. Hi lbol, i am curious if what i did would work for you. On my rhel4 and ia64 machine, i tried to use the pagesize not 4k but 64k. The exit code of a c program is a small positive integer, so exit1 is better than exit1. The two programs shown below exchange a string using a shared memory segment.
I can delete arp entries siocdarp, get arp entries siocgarp, but im having troubles setting entries with i the unix and linux forums. When i try to run valgrind on my program, shmat or mmap fail w invalid argument. I was speaking to the production guys and its one of the software tools they use that is doing it. This software can be used along with the patched osmotetra software to monitor and listen to unencrypted tetra communications. When running on my raspberry pi3 linux raspberrypi 4. Valgrind, an opensource memory debugger valgrindusers. Windows requires that attached shared memory regions be aligned on 64k boundaries. There is no assurance that perror does not change errno, so i. Hello everybody, ive been programming an alternative to linux s standard arp program.
Solved invalid character in cp command linux forum. How to calibrate rtlsdr using kalibratertl on linux. But if valgrind isnt active, everything works fine. Invalid argument when running find command with exec and. I notice the original author had 0666 in his flags. There is no assurance that perror does not change errno, so i saved errno before calling perror each time.
Aug 18, 2017 i found it because local tmpptr syscall. Nov 20, 2015 hi forum, i am having problems with running graphicsgimp on a fresh install of freebsd 10. I am supposed to remove the ipc resources using atexit but i dont think i am doing it right. Reason for this new option is to allow running this testcase as sanity test, that doesnt need go through full content of files such as pagemap which can take hours. So youll need to turn that feature off using the linux system you used to create the usb stick. While were at it, where can i find documentation of the values accepted in the flag argument for shmget. Attaching a shared memory segment to an address space shmat after a shared memory id is returned, the next step is to attach it to the address space of a process.
I would never have known that was possible, after reading just the shmget manpage. Attaching a shared memory segment to an address space shmat. The linux implementation of this interface may differ consult the corresponding linux manual page for details of linux behavior, or the interface may not be implemented on linux. Invalid argument when trying to mount my usb ask ubuntu. If you run this without args or without first running with w it will fail with shmat return null,errno22. Valgrindusers shmat calls fails with invalid argument under valgrind.
On windows 9x, shmat can only be used to map items to addresses between 0x80000000 and. The rtlsdr is an ultra cheap software defined radio based on dvbt tv tuners. I also found a bug in the partitioner almost immediatelydespite giving me freebsdzfs as an example of a valid field to freetype into its type. Suse linux enterprise server 10 service pack 2 with linux kernel 2. The most likely explanation is that this driver doesnt have a write method at all. Ive downloaded and run your program and am unable to reproduce your conflicting results. Wondering if there is a way to get the echo command to work so that i can get my usb modem working. Btw, one more question is from the shmmax value i can see that its around some giga bytes. The best i can think of so far is that i have to use sudo otherwise it will not let me allocate the pages. On linux, it is possible to attach a shared memory segment even if it is already marked to be deleted. If you are setting permissions with the setfacl command when using symfony or any other php framework that requires write access to certain directories or files, and you get the following error.
This manual page is part of the posix programmers manual. It is fairly routine for drivers not to support certain actions, e. Add option m to set upper limit of read megabytes from single proc file. Notes using shmat with shmaddr equal to null is the preferred, portable way of attaching a shared memory. However, i get a valgrind warning and an invalid argument error. System v shared memory operations linux man pages 2. On many linux architectures, shmlba is the same as the system page size.