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not all systems (eg, QNX) that have mprotect have getpagesize

This commit is contained in:
Bill Currie 2003-07-17 21:01:25 +00:00
parent 37f660801b
commit b36bd6a98c
2 changed files with 8 additions and 7 deletions
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2
configure.ac
View File

@ -425,7 +425,7 @@ AC_CHECK_FUNCS(
access _access gethostname gethostbyname connect gettimeofday getwd \
mkdir _mkdir ftime _ftime fcntl stat putenv select socket strerror \
strcasestr strnlen strstr snprintf _snprintf vsnprintf _vsnprintf \
strsep dlopen getaddrinfo getnameinfo mprotect
strsep dlopen getaddrinfo getnameinfo mprotect getpagesize
)
DL_LIBS=""

13
libs/util/sys.c
View File

@ -338,15 +338,16 @@ Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)
#else
# ifdef HAVE_MPROTECT
int r;
unsigned long addr;
unsigned long endaddr = startaddr + length;
# ifdef HAVE_GETPAGESIZE
int psize = getpagesize ();
addr = (startaddr & ~(psize - 1)) - psize;
startaddr &= ~(psize - 1);
endaddr = (endaddr + psize - 1) & ~(psize - 1);
# endif
// fprintf(stderr, "writable code %lx(%lx)-%lx, length=%lx\n", startaddr,
// addr, startaddr+length, length);
r = mprotect ((char *) addr, length + startaddr - addr + psize, 7);
r = mprotect ((char *) startaddr, endaddr - startaddr, 7);
if (r < 0)
Sys_Error ("Protection change failed");