Mercurial > hg > toybox
view toys/other/mkswap.c @ 668:0ee40175a307
Fix catv to display byte 255 correctly. (It's both M- and ^?.)
author | Rob Landley <rob@landley.net> |
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date | Sat, 06 Oct 2012 01:54:24 -0500 |
parents | 6df4ccc0acbe |
children | 786841fdb1e0 |
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/* vi: set sw=4 ts=4: * * mkswap.c - Format swap device. * * Copyright 2009 Rob Landley <rob@landley.net> USE_MKSWAP(NEWTOY(mkswap, "<1>1", TOYFLAG_SBIN)) config MKSWAP bool "mkswap" default y help usage: mkswap DEVICE Sets up a Linux swap area on a device or file. */ #include "toys.h" void mkswap_main(void) { int fd = xopen(*toys.optargs, O_RDWR), pagesize = sysconf(_SC_PAGE_SIZE); off_t len = fdlength(fd); unsigned int pages = (len/pagesize)-1, *swap = (unsigned int *)toybuf; // Write header. Note that older kernel versions checked signature // on disk (not in cache) during swapon, so sync after writing. swap[0] = 1; swap[1] = pages; xlseek(fd, 1024, SEEK_SET); xwrite(fd, swap, 129*sizeof(unsigned int)); xlseek(fd, pagesize-10, SEEK_SET); xwrite(fd, "SWAPSPACE2", 10); fsync(fd); if (CFG_TOYBOX_FREE) close(fd); printf("Swapspace size: %luk\n", pages*(unsigned long)(pagesize/1024)); }