mmap

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extendable mremap on anonymously mmaped memory

I was believing mremap would have a realloc-like behavior until debugging things like the following lines of cod开发者_如何学Ce in C.[详细]

2023-03-29 23:52 分类：问答
When does an O_SYNC write become visible in the pagecache (mmap'd file)?

I have a file mmap\'d read-only/shared, with multiple threads/processes reading the data concurrently. A single writer is allowed to modify the data at any time (using a mutex in a separate shared mem[详细]

2023-03-28 15:56 分类：问答
Mistake, or valgrind/gcc bug?

When running valgrind on the following program the assertion fails: #include <unistd.h> #include <sys/mman.h>[详细]

2023-03-27 19:45 分类：问答
MEM_SHARED, mmap, and hard links

Just wondering if the key to shared memory is the file name or the inode. I have a file called .last, which is just a hard link to a file named YYYYMMDDHHMMSS.[详细]

2023-03-27 17:27 分类：问答
Why does fopen/fgets use both mmap and read system calls to access the data?

I have a small example program which simply fopens a file and uses fgets to read it. Using strace, I notice that the first call to fgets runs a mmap system call, and then read system calls are used to[详细]

2023-03-27 15:05 分类：问答
mmap(): what happens if underlying file changes (shrinks)?

If you memory map a file using mmap(), but then the un开发者_如何学JAVAderlying file changes to a much smaller size. What happens if you access a memory offset that was shaved off from the file?IBM sa[详细]

2023-03-24 01:08 分类：问答
using mmap in python

can somebody please explain how does 0 influence mmap in python in this case: mmap.mmap(0 , 256, \"some tag\")[详细]

2023-03-23 18:55 分类：问答
Legacy code: mmap zero page: Operation not permitted - where should i start?

I\'ve to deal with old C- Sourcecode. After I managed to compile it, while running it I get the error message[详细]

2023-03-23 03:03 分类：问答
mmap slower than getline?

I face the challenge of reading/writing files (in Gigs) line by line. Reading many forum entries and sites (including a bunch of SO\'s), mmap was suggested as the fastest option to read/write files.[详细]

2023-03-19 07:00 分类：问答
Linux: create mmap()able virtual file (e.g. SPI memory)

I have a char device which enables access to an external SPI memory, and I\'d like to mmap() the external memory so that I can access it from a program as if开发者_StackOverflow it were normal memory.[详细]

2023-03-18 19:52 分类：问答