Date: Sun, 11 Jun 2017 10:37:17 +0200 From: u-klys@aetey.se To: freebsd-emulation@freebsd.org Subject: linux_mremap() with MREMAP_MAYMOVE - not implemented? Message-ID: <20170611083717.GM30784@example.net>
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Hello,
I am to run Linux binaries (i386) under FreeBSD 11.0-RELEASE (amd64).
The behaviour which surprises me is as follows
$ truss ./rea
linux_set_thread_area(0xffffcc3c) = 0 (0x0)
linux_set_tid_address(0x804fb2c) = 75293 (0x1261d)
linux_mmap2(0x0,0x101000,0x3,0x22,0xffffffff,0x0) = 671412224 (0x2804f000)
linux_mremap(0x2804f000,0x101000,0x201000,0x1,0x0) ERR#-12 'Cannot allocate memory'
linux_ioctl(0x1,0x5413,0xffffcae4) = 0 (0x0)
FAILED REALLOCATING from 1 M to 2 M
linux_writev(0x1,0xffffcab4,0x2) = 35 (0x23)
linux_exit_group(0x0)
process exit, rval = 0
$
The test binary is compiled under Linux from
$ cat rea.c
#include <stdio.h>
#include <stdlib.h>
#define DELTA (1024*1024)
int main( int argc, char **argv ){
unsigned int i = DELTA;
char *p, *q;
if( !(p = malloc(i)) ) return 1;
while( (q=realloc(p, (i+=DELTA))) )
p = q;
printf("FAILED REALLOCATING from %u M to %u M\n", i/DELTA-1, i/DELTA);
return 0;
}
$
and statically linked against musl standard C library which relies
on mremap() in its malloc implementation.
Is support for MREMAP_MAYMOVE missing?
Regards,
Rune
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