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vm: fix mapping of file's last page

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thanks @red_prig for investigation
This commit is contained in:
DH 2024-08-31 21:17:02 +03:00
parent ea2915467a
commit e6022c1c4c
6 changed files with 136 additions and 69 deletions
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27
rx/src/mem.cpp Normal file
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@ -0,0 +1,27 @@
#include "mem.hpp"
#include <sys/mman.h>
#include <unistd.h>
extern const std::size_t rx::mem::pageSize = sysconf(_SC_PAGE_SIZE);
void *rx::mem::map(void *address, std::size_t size, int prot, int flags,
int fd, std::ptrdiff_t offset) {
return ::mmap(address, size, prot, flags, fd, offset);
}
void *rx::mem::reserve(std::size_t size) {
return map(nullptr, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS);
}
bool rx::mem::reserve(void *address, std::size_t size) {
return map(address, size, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED) != MAP_FAILED;
}
bool rx::mem::protect(void *address, std::size_t size, int prot) {
return ::mprotect(address, size, prot) == 0;
}
bool rx::mem::unmap(void *address, std::size_t size) {
return ::munmap(address, size) == 0;
}