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Implement getpagesize() for djgpp

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This is the "correct" way to find the page size on DPMI.  In practice
though, this could be hardcoded to return 4096 and no one would ever
notice the difference.
This commit is contained in:
J.W. Jagersma 2022-03-18 15:47:41 +01:00
parent 8271e43e5e
commit b625c597e7
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1 changed files with 9 additions and 0 deletions
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9
src/os.cc
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@ -51,6 +51,10 @@
# include <windows.h>
#endif
#ifdef DJGPP
# include <dpmi.h>
#endif
#ifdef fileno
# undef fileno
#endif
@ -354,6 +358,11 @@ long getpagesize() {
SYSTEM_INFO si;
GetSystemInfo(&si);
return si.dwPageSize;
# elif defined(DJGPP)
unsigned long size;
if (__dpmi_get_page_size(&size) != 0)
FMT_THROW(system_error(ENOSYS, "cannot get memory page size"));
return size;
# else
long size = FMT_POSIX_CALL(sysconf(_SC_PAGESIZE));
if (size < 0) FMT_THROW(system_error(errno, "cannot get memory page size"));