4f294c247f
This patch mainly copies and modifies files existing in the current libc implementing minix specific functions. To keep consisten with the NetBSD libc, we remove namespace stubs and we use "namespace.h" and weak links.
35 lines
939 B
C
35 lines
939 B
C
#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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#include <unistd.h>
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#ifdef __weak_alias
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__weak_alias(brk, _brk)
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#endif
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extern char *_brksize;
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/* Both OSF/1 and SYSVR4 man pages specify that brk(2) returns int.
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* However, BSD4.3 specifies that brk() returns char*. POSIX omits
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* brk() on the grounds that it imposes a memory model on an architecture.
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* For this reason, brk() and sbrk() are not in the lib/posix directory.
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* On the other hand, they are so crucial to correct operation of so many
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* parts of the system, that we have chosen to hide the name brk using _brk,
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* as with system calls. In this way, if a user inadvertently defines a
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* procedure brk, MINIX may continue to work because the true call is _brk.
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*/
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PUBLIC int brk(addr)
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void *addr;
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{
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message m;
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if (addr != _brksize) {
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m.PMBRK_ADDR = addr;
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if (_syscall(PM_PROC_NR, BRK, &m) < 0) return(-1);
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_brksize = m.m2_p1;
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}
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return(0);
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}
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