2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
35 lines
939 B
C
35 lines
939 B
C
#include <sys/cdefs.h>
|
|
#include "namespace.h"
|
|
#include <lib.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(brk, _brk)
|
|
#endif
|
|
|
|
extern char *_brksize;
|
|
|
|
/* Both OSF/1 and SYSVR4 man pages specify that brk(2) returns int.
|
|
* However, BSD4.3 specifies that brk() returns char*. POSIX omits
|
|
* brk() on the grounds that it imposes a memory model on an architecture.
|
|
* For this reason, brk() and sbrk() are not in the lib/posix directory.
|
|
* On the other hand, they are so crucial to correct operation of so many
|
|
* parts of the system, that we have chosen to hide the name brk using _brk,
|
|
* as with system calls. In this way, if a user inadvertently defines a
|
|
* procedure brk, MINIX may continue to work because the true call is _brk.
|
|
*/
|
|
PUBLIC int brk(addr)
|
|
void *addr;
|
|
{
|
|
message m;
|
|
|
|
if (addr != _brksize) {
|
|
m.PMBRK_ADDR = addr;
|
|
if (_syscall(PM_PROC_NR, BRK, &m) < 0) return(-1);
|
|
_brksize = m.m2_p1;
|
|
}
|
|
return(0);
|
|
}
|
|
|