Hi, I am a bit new to the Linux ecosystem and was doing some development that required interaction with Linux syscalls. I understand that for 32-bit Linux, there is a mmap2 syscall in addition to mmap. However, I m not sure what is the difference between mmap2 and mmap_pgoff. From what I understand, they are identical in functionality but I dont observe mmap_pgoff in my 32-bit system files. I only observe mmap2. By the way, I am using an Ubuntu Linux distribution. Could someone enlighten me on this?

Hi & Welcome to Linux Questions.

From what I found online the mmap-pgoff system call fetches the struct file* corresponding to the bile descripter argument and calls to the mmap-pgoff. The mmap() call is implemented by libc, which invokes the mmap_pgoff() system call.

If you haven't found mmap-pgoff on your system try using the locate or find command.
If that fails use dpkg -L <name of pkg or lib> to see if it's installed.

https://stackoverflow.com/questions/...ap-kernel-call

http://www.polarhome.com/service/man...=2&of=SuSE&sf=

The font on the second link is horrible so you'll have to hold down the CTRL key and the + key to make it readable.

This might help too-

https://www.quora.com/How-do-the-brk...e-Linux-kernel

Good Luck