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portable error reporting for memory API

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This commit is contained in:
Daniel Micay
2021-03-22 13:59:16 -04:00
parent f773a96b59
commit 29ffcdf810
2 changed files with 33 additions and 38 deletions
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54
memory.c
View File

@@ -25,30 +25,28 @@ void *memory_map(size_t size) {
return p;
}
int memory_map_fixed(void *ptr, size_t size) {
bool memory_map_fixed(void *ptr, size_t size) {
void *p = mmap(ptr, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE|MAP_FIXED, -1, 0);
if (unlikely(p == MAP_FAILED)) {
if (errno != ENOMEM) {
fatal_error("non-ENOMEM MAP_FIXED mmap failure");
}
return 1;
bool ret = p == MAP_FAILED;
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM MAP_FIXED mmap failure");
}
return 0;
return ret;
}
int memory_unmap(void *ptr, size_t size) {
int ret = munmap(ptr, size);
bool memory_unmap(void *ptr, size_t size) {
bool ret = munmap(ptr, size);
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM munmap failure");
}
return ret;
}
static int memory_protect_prot(void *ptr, size_t size, int prot, UNUSED int pkey) {
static bool memory_protect_prot(void *ptr, size_t size, int prot, UNUSED int pkey) {
#ifdef USE_PKEY
int ret = pkey_mprotect(ptr, size, prot, pkey);
bool ret = pkey_mprotect(ptr, size, prot, pkey);
#else
int ret = mprotect(ptr, size, prot);
bool ret = mprotect(ptr, size, prot);
#endif
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM mprotect failure");
@@ -56,43 +54,39 @@ static int memory_protect_prot(void *ptr, size_t size, int prot, UNUSED int pkey
return ret;
}
int memory_protect_ro(void *ptr, size_t size) {
bool memory_protect_ro(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ, -1);
}
int memory_protect_rw(void *ptr, size_t size) {
bool memory_protect_rw(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ|PROT_WRITE, -1);
}
int memory_protect_rw_metadata(void *ptr, size_t size) {
bool memory_protect_rw_metadata(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ|PROT_WRITE, get_metadata_key());
}
#ifdef HAVE_COMPATIBLE_MREMAP
int memory_remap(void *old, size_t old_size, size_t new_size) {
bool memory_remap(void *old, size_t old_size, size_t new_size) {
void *ptr = mremap(old, old_size, new_size, 0);
if (unlikely(ptr == MAP_FAILED)) {
if (errno != ENOMEM) {
fatal_error("non-ENOMEM mremap failure");
}
return 1;
bool ret = ptr == MAP_FAILED;
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM mremap failure");
}
return 0;
return ret;
}
int memory_remap_fixed(void *old, size_t old_size, void *new, size_t new_size) {
bool memory_remap_fixed(void *old, size_t old_size, void *new, size_t new_size) {
void *ptr = mremap(old, old_size, new_size, MREMAP_MAYMOVE|MREMAP_FIXED, new);
if (unlikely(ptr == MAP_FAILED)) {
if (errno != ENOMEM) {
fatal_error("non-ENOMEM MREMAP_FIXED mremap failure");
}
return 1;
bool ret = ptr == MAP_FAILED;
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM MREMAP_FIXED mremap failure");
}
return 0;
return ret;
}
#endif
int memory_purge(void *ptr, size_t size) {
bool memory_purge(void *ptr, size_t size) {
int ret = madvise(ptr, size, MADV_DONTNEED);
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM MADV_DONTNEED madvise failure");

17
memory.h
View File

@@ -1,6 +1,7 @@
#ifndef MEMORY_H
#define MEMORY_H
#include <stdbool.h>
#include <stddef.h>
#ifdef __linux__
@@ -10,16 +11,16 @@
int get_metadata_key(void);
void *memory_map(size_t size);
int memory_map_fixed(void *ptr, size_t size);
int memory_unmap(void *ptr, size_t size);
int memory_protect_ro(void *ptr, size_t size);
int memory_protect_rw(void *ptr, size_t size);
int memory_protect_rw_metadata(void *ptr, size_t size);
bool memory_map_fixed(void *ptr, size_t size);
bool memory_unmap(void *ptr, size_t size);
bool memory_protect_ro(void *ptr, size_t size);
bool memory_protect_rw(void *ptr, size_t size);
bool memory_protect_rw_metadata(void *ptr, size_t size);
#ifdef HAVE_COMPATIBLE_MREMAP
int memory_remap(void *old, size_t old_size, size_t new_size);
int memory_remap_fixed(void *old, size_t old_size, void *new, size_t new_size);
bool memory_remap(void *old, size_t old_size, size_t new_size);
bool memory_remap_fixed(void *old, size_t old_size, void *new, size_t new_size);
#endif
int memory_purge(void *ptr, size_t size);
bool memory_purge(void *ptr, size_t size);
void memory_set_name(void *ptr, size_t size, const char *name);
#endif