/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <draw.h>#include <event.h>#include <bio.h>#include "page.h" void*emalloc(int sz){	void *v;	v = malloc(sz);	if(v == nil) {		fprint(2, "out of memory allocating %d\n", sz);		wexits("mem");	}	memset(v, 0, sz);	return v;} void*erealloc(void *v, int sz){	v = realloc(v, sz);	if(v == nil) {		fprint(2, "out of memory allocating %d\n", sz);		wexits("mem");	}	return v;} char*estrdup(char *s){	char *t;	if((t = strdup(s)) == nil) {		fprint(2, "out of memory in strdup(%.10s)\n", s);		wexits("mem");	}	return t;} intopentemp(char *template){	int fd, i;	char *p; 	p = estrdup(template);	fd = -1;	for(i=0; i<10; i++){		mktemp(p);		if(access(p, 0) < 0 && (fd=create(p, ORDWR|ORCLOSE, 0400)) >= 0)			break;		strcpy(p, template);	}	if(fd < 0){		fprint(2, "couldn't make temporary file\n");		wexits("Ecreat");	}	strcpy(template, p);	free(p); 	return fd;} /* * spool standard input to /tmp. * we've already read the initial in bytes into ibuf. */intspooltodisk(uchar *ibuf, int in, char **name){	uchar buf[8192];	int fd, n;	char temp[40]; 	strcpy(temp, "/tmp/pagespoolXXXXXXXXX");	fd = opentemp(temp);	if(name)		*name = estrdup(temp); 	if(write(fd, ibuf, in) != in){		fprint(2, "error writing temporary file\n");		wexits("write temp");	} 	while((n = read(stdinfd, buf, sizeof buf)) > 0){		if(write(fd, buf, n) != n){			fprint(2, "error writing temporary file\n");			wexits("write temp0");		}	}	seek(fd, 0, 0);	return fd;} /* * spool standard input into a pipe. * we've already ready the first in bytes into ibuf */intstdinpipe(uchar *ibuf, int in){	uchar buf[8192];	int n;	int p[2];	if(pipe(p) < 0){		fprint(2, "pipe fails: %r\n");			wexits("pipe");	} 	switch(rfork(RFMEM|RFPROC|RFFDG)){	case -1:		fprint(2, "fork fails: %r\n");		wexits("fork");	default:		close(p[1]);		return p[0];	case 0:		break;	} 	close(p[0]);	write(p[1], ibuf, in);	while((n = read(stdinfd, buf, sizeof buf)) > 0)		write(p[1], buf, n); 	_exits(0);	return -1;	/* not reached */} /* try to update the label, but don't fail on any errors */voidsetlabel(char *label){	char *s;	int fd; 	s = smprint("%s/label", display->windir);	if (s == nil)		return;	fd = open(s, OWRITE);	free(s);	if(fd >= 0){		write(fd, label, strlen(label));		close(fd);	}	werrstr("");}