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improve swap

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This commit is contained in:
cinap_lenrek 2011-08-22 10:03:15 +02:00
parent e61553c52c
commit 0e5148b269
5 changed files with 51 additions and 54 deletions
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82
sys/src/cmd/swap.c
View file

@ -1,66 +1,54 @@
#include <u.h>
#include <libc.h>
void error(char *);
void
main(int argc, char **argv)
{
Dir *d;
int swapfd, cswfd;
char buf[128], *p;
int i, j;
char buf[1024], *p;
Dir *d;
if(argc != 2) {
print("Usage: swap path\n");
exits("swap: failed");
ARGBEGIN {
} ARGEND;
if(argc != 1){
fprint(2, "Usage: swap file\n");
exits("usage");
}
d = dirstat(argv[1]);
if(d == nil){
print("swap: can't stat %s: %r\n", argv[1]);
exits("swap: failed");
}
if(d->type != 'M'){ /* kernel device */
swapfd = open(argv[1], ORDWR);
p = argv[1];
}
else {
p = getenv("sysname");
if(p == 0)
p = "swap";
sprint(buf, "%s/%sXXXXXXX", argv[1], p);
p = mktemp(buf);
swapfd = create(p, ORDWR|ORCLOSE, 0600);
swapfd = -1;
if(d = dirstat(p = *argv)){
if(d->mode & DMDIR){
p = getenv("sysname");
if(p == 0)
p = "swap";
snprint(buf, sizeof buf, "%s/%sXXXXXXX", *argv, p);
p = mktemp(buf);
} else
swapfd = open(p, ORDWR);
}
if(d == nil || (d->mode & DMDIR)){
if((swapfd = create(p, ORDWR|ORCLOSE, 0600)) >= 0){
Dir nd;
if(swapfd < 0 || (p[0] == '/' && p[1] == '\0')) {
print("swap: failed to make a file: %r\n");
exits("swap: failed");
nulldir(&nd);
nd.mode = DMTMP|0600;
dirfwstat(swapfd, &nd);
}
}
if(swapfd < 0)
sysfatal("%r");
if(fd2path(swapfd, p = buf, sizeof buf))
sysfatal("fd2path: %r");
if(putenv("swap", p) < 0)
sysfatal("putenv: %r");
i = create("/env/swap", OWRITE, 0666);
if(i < 0)
error("open /env/swap");
if(write(i, p, strlen(p)) != strlen(p))
error("sysname");
close(i);
print("swap: %s\n", p);
cswfd = open("/dev/swap", OWRITE);
if(cswfd < 0)
error("open: /dev/swap");
if((cswfd = open("/dev/swap", OWRITE)) < 0)
sysfatal("open: %r");
if(fprint(cswfd, "%d", swapfd) < 0)
sysfatal("write: %r");
j = sprint(buf, "%d", swapfd);
if(write(cswfd, buf, j) != j)
error("write: /dev/swap");
exits(0);
}
void
error(char *s)
{
perror(s);
exits(s);
}