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object-file: move `xmmap()` into "wrapper.c" 

The `xmmap()` function is provided by "object-file.c" even though its
functionality has nothing to do with the object file subsystem. Move it
into "wrapper.c", whose header already declares those functions.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
main
Patrick Steinhardt 2025-04-15 11:38:17 +02:00 committed by Junio C Hamano
parent 97dc141fd6
commit 632b5e3ee2
2 changed files with 48 additions and 48 deletions
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48
object-file.c
View File

@ -718,54 +718,6 @@ int has_loose_object(const struct object_id *oid)
return check_and_freshen(oid, 0); return check_and_freshen(oid, 0);
} }


static void mmap_limit_check(size_t length)
{
static size_t limit = 0;
if (!limit) {
limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
if (!limit)
limit = SIZE_MAX;
}
if (length > limit)
die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
(uintmax_t)length, (uintmax_t)limit);
}

void *xmmap_gently(void *start, size_t length,
int prot, int flags, int fd, off_t offset)
{
void *ret;

mmap_limit_check(length);
ret = mmap(start, length, prot, flags, fd, offset);
if (ret == MAP_FAILED && !length)
ret = NULL;
return ret;
}

const char *mmap_os_err(void)
{
static const char blank[] = "";
#if defined(__linux__)
if (errno == ENOMEM) {
/* this continues an existing error message: */
static const char enomem[] =
", check sys.vm.max_map_count and/or RLIMIT_DATA";
return enomem;
}
#endif /* OS-specific bits */
return blank;
}

void *xmmap(void *start, size_t length,
int prot, int flags, int fd, off_t offset)
{
void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
if (ret == MAP_FAILED)
die_errno(_("mmap failed%s"), mmap_os_err());
return ret;
}

static int format_object_header_literally(char *str, size_t size, static int format_object_header_literally(char *str, size_t size,
const char *type, size_t objsize) const char *type, size_t objsize)
{ {

48
wrapper.c
View File

@ -829,3 +829,51 @@ uint32_t git_rand(unsigned flags)


return result; return result;
} }

static void mmap_limit_check(size_t length)
{
static size_t limit = 0;
if (!limit) {
limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
if (!limit)
limit = SIZE_MAX;
}
if (length > limit)
die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
(uintmax_t)length, (uintmax_t)limit);
}

void *xmmap_gently(void *start, size_t length,
int prot, int flags, int fd, off_t offset)
{
void *ret;

mmap_limit_check(length);
ret = mmap(start, length, prot, flags, fd, offset);
if (ret == MAP_FAILED && !length)
ret = NULL;
return ret;
}

const char *mmap_os_err(void)
{
static const char blank[] = "";
#if defined(__linux__)
if (errno == ENOMEM) {
/* this continues an existing error message: */
static const char enomem[] =
", check sys.vm.max_map_count and/or RLIMIT_DATA";
return enomem;
}
#endif /* OS-specific bits */
return blank;
}

void *xmmap(void *start, size_t length,
int prot, int flags, int fd, off_t offset)
{
void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
if (ret == MAP_FAILED)
die_errno(_("mmap failed%s"), mmap_os_err());
return ret;
}