Messages in this thread | | | Date | Thu, 2 Dec 1999 22:26:16 +0200 (IST) | From | Matan Ziv-Av <> | Subject | /proc/self/mem |
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Hi
As of 2.3.27 mmapping of /proc/self/mem is not possible. svgalib (in background mode uses it as follows):
1. frame buffer (at physical 0x000a0000) is mapped into program's memory space (at GM=0x43210000, for example)
2. program writes to screen.
3. a console switch occurs (program goes to background)
4. svgalib allocates a virtual frame buffer (at VBF), and copies the physical one to it.
5. svgalib calls mmap(GM,0x10000,,,proc_self_mem_fd,VBF), so that writes at 0x4321xxxx go to the virtual frame buffer, and not to the physical one.
6. when the program returns to foreground, svgalib copies virtual frame buffer to physical.
Now, step 5 is broken. Is the same result (that of the mmap in step 5) achievable by other means?
-- Matan Ziv-Av. matan@svgalib.org
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