ed1af3c86c
complete munmap implementation; single-page references made a general munmap() implementation possible to write cleanly. . memory: let the MIOCRAMSIZE ioctl set the imgrd device size (but only to 0) . let the ramdisk command set sizes to 0 . use this command to set /dev/imgrd to 0 after mounting /usr in /etc/rc, so the boot time ramdisk is freed (about 4MB currently)
46 lines
697 B
C
46 lines
697 B
C
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#include <paths.h>
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#include <sys/ioc_memory.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <stdlib.h>
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int
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main(int argc, char *argv[])
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{
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int fd;
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signed long size;
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char *d;
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if(argc < 2 || argc > 3) {
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fprintf(stderr, "usage: %s <size in kB> [device]\n",
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argv[0]);
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return 1;
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}
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d = argc == 2 ? _PATH_RAMDISK : argv[2];
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if((fd=open(d, O_RDONLY)) < 0) {
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perror(d);
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return 1;
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}
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#define KFACTOR 1024
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size = atol(argv[1])*KFACTOR;
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if(size < 0) {
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fprintf(stderr, "size should be non-negative.\n");
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return 1;
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}
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if(ioctl(fd, MIOCRAMSIZE, &size) < 0) {
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perror("MIOCRAMSIZE");
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return 1;
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}
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fprintf(stderr, "size on %s set to %dkB\n", d, size/KFACTOR);
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return 0;
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}
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