8 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
11 /* max mmap size, *start is the largest power-of-2 size considered */
12 static size_t mmax(int fd, size_t *start)
17 for (i=n=*start; i>=PAGE_SIZE; i/=2) {
18 if ((p=mmap(0, n, PROT_NONE, MAP_PRIVATE, fd, 0)) == MAP_FAILED) {
27 return n & -PAGE_SIZE;
31 fills the virtual memory with anonymous PROT_NONE mmaps,
32 returns the mappings in *p and *n in decreasing size order,
33 the return value is the number of mappings or -1 on failure.
35 int t_vmfill(void **p, size_t *n, int len)
37 int fd = open("/dev/zero", O_RDWR);
38 size_t start = SIZE_MAX/2 + 1;
47 q = mmap(0, m, PROT_NONE, MAP_PRIVATE, fd, 0);