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	post9p.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	post9p.c (1523B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3
	4 int chattyfuse;
	5
	6 int
	7 post9pservice(int fd, char name, char mtpt)
	8 {
	9 int i, pid;
	10 char ns, addr;
	11 Waitmsg *w;
	12
	13 if(name == nil && mtpt == nil){
	14 close(fd);
	15 werrstr("nothing to do");
	16 return -1;
	17 }
	18
	19 if(name){
	20 if(strchr(name, '!')) /* assume is already networ…
	21 addr = strdup(name);
	22 else{
	23 if((ns = getns()) == nil)
	24 return -1;
	25 addr = smprint("unix!%s/%s", ns, name);
	26 free(ns);
	27 }
	28 if(addr == nil)
	29 return -1;
	30 switch(pid = fork()){
	31 case -1:
	32 return -1;
	33 case 0:
	34 dup(fd, 0);
	35 dup(fd, 1);
	36 for(i=3; i<20; i++)
	37 close(i);
	38 execlp("9pserve", "9pserve", "-u", addr, (char*)…
	39 fprint(2, "exec 9pserve: %r\n");
	40 _exits("exec");
	41 }
	42 close(fd);
	43 w = waitfor(pid);
	44 if(w == nil)
	45 return -1;
	46 if(w->msg && w->msg[0]){
	47 free(w);
	48 werrstr("9pserve failed");
	49 return -1;
	50 }
	51 free(w);
	52 if(mtpt){
	53 /* reopen */
	54 if((fd = dial(addr, nil, nil, nil)) < 0){
	55 werrstr("cannot reopen for mount: %r");
	56 return -1;
	57 }
	58 }
	59 free(addr);
	60 }
	61 if(mtpt){
	62 switch(pid = rfork(RFFDG\|RFPROC\|RFNOWAIT)){
	63 case -1:
	64 return -1;
	65 case 0:
	66 dup(fd, 0);
	67 for(i=3; i<20; i++)
	68 close(i);
	69
	70 /* Try v9fs on Linux, which will mount 9P direct…
	71 execlp("mount9p", "mount9p", "-", mtpt, (char*)0…
	72
	73 if(chattyfuse)
	74 execlp("9pfuse", "9pfuse", "-D", "-", mt…
	75 else
	76 execlp("9pfuse", "9pfuse", "-", mtpt, (c…
	77 fprint(2, "exec 9pfuse: %r\n");
	78 _exits("exec");
	79 }
	80 close(fd);
	81 }
	82 return 0;
	83 }