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[blob] Use MAP_NORESERVE if available (#1039) 

MAP_NORESERVE is not available on macOS for example so set the flag
to zero if not defined on the headers.
This commit is contained in:
Ebrahim Byagowi 2018-05-26 23:50:10 +04:30 committed by GitHub
parent 1ce40d900a
commit 65c82179c9
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1 changed files with 5 additions and 1 deletions
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6
src/hb-blob.cc
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@ -495,6 +495,10 @@ hb_blob_t::try_make_writable (void)
# define _O_BINARY 0
#endif
#ifndef MAP_NORESERVE
# define MAP_NORESERVE 0
#endif
struct hb_mapped_file_t
{
char *contents;
@ -551,7 +555,7 @@ hb_blob_create_from_file (const char *file_name)
file->length = (unsigned long) st.st_size;
file->contents = (char *) mmap (nullptr, file->length,
writable ? PROT_READ|PROT_WRITE : PROT_READ,
MAP_PRIVATE, fd, 0);
MAP_PRIVATE | MAP_NORESERVE, fd, 0);
if (unlikely (file->contents == MAP_FAILED)) goto fail;