1 b2cfc4e2 2003-09-30 devnull /*
 2 b2cfc4e2 2003-09-30 devnull  * We assume there's only one error buffer for the whole system.
 3 b2cfc4e2 2003-09-30 devnull  * If you use ffork, you need to provide a _syserrstr.  Since most
 4 b2cfc4e2 2003-09-30 devnull  * people will use libthread (which provides a _syserrstr), this is
 5 b2cfc4e2 2003-09-30 devnull  * okay.
 6 b2cfc4e2 2003-09-30 devnull  */
 7 b2cfc4e2 2003-09-30 devnull 
 8 8ad51794 2004-03-25 devnull #include <u.h>
 9 b2cfc4e2 2003-09-30 devnull #include <errno.h>
10 b2cfc4e2 2003-09-30 devnull #include <string.h>
11 8ad51794 2004-03-25 devnull #include <libc.h>
12 b2cfc4e2 2003-09-30 devnull 
13 b2cfc4e2 2003-09-30 devnull enum
14 b2cfc4e2 2003-09-30 devnull {
15 cbeb0b26 2006-04-01 devnull 	EPLAN9 = 0x19283745
16 b2cfc4e2 2003-09-30 devnull };
17 b2cfc4e2 2003-09-30 devnull 
18 b2cfc4e2 2003-09-30 devnull char *(*_syserrstr)(void);
19 b2cfc4e2 2003-09-30 devnull static char xsyserr[ERRMAX];
20 b2cfc4e2 2003-09-30 devnull static char*
21 b2cfc4e2 2003-09-30 devnull getsyserr(void)
22 b2cfc4e2 2003-09-30 devnull {
23 b2cfc4e2 2003-09-30 devnull 	char *s;
24 b2cfc4e2 2003-09-30 devnull 
25 b2cfc4e2 2003-09-30 devnull 	s = nil;
26 b2cfc4e2 2003-09-30 devnull 	if(_syserrstr)
27 b2cfc4e2 2003-09-30 devnull 		s = (*_syserrstr)();
28 b2cfc4e2 2003-09-30 devnull 	if(s == nil)
29 b2cfc4e2 2003-09-30 devnull 		s = xsyserr;
30 b2cfc4e2 2003-09-30 devnull 	return s;
31 b2cfc4e2 2003-09-30 devnull }
32 b2cfc4e2 2003-09-30 devnull 
33 b2cfc4e2 2003-09-30 devnull int
34 b2cfc4e2 2003-09-30 devnull errstr(char *err, uint n)
35 b2cfc4e2 2003-09-30 devnull {
36 b2cfc4e2 2003-09-30 devnull 	char tmp[ERRMAX];
37 b2cfc4e2 2003-09-30 devnull 	char *syserr;
38 b2cfc4e2 2003-09-30 devnull 
39 66c10f02 2005-01-04 devnull 	strecpy(tmp, tmp+ERRMAX, err);
40 66c10f02 2005-01-04 devnull 	rerrstr(err, n);
41 b2cfc4e2 2003-09-30 devnull 	syserr = getsyserr();
42 66c10f02 2005-01-04 devnull 	strecpy(syserr, syserr+ERRMAX, tmp);
43 b2cfc4e2 2003-09-30 devnull 	errno = EPLAN9;
44 b2cfc4e2 2003-09-30 devnull 	return 0;
45 b2cfc4e2 2003-09-30 devnull }
46 b2cfc4e2 2003-09-30 devnull 
47 b2cfc4e2 2003-09-30 devnull void
48 b2cfc4e2 2003-09-30 devnull rerrstr(char *err, uint n)
49 b2cfc4e2 2003-09-30 devnull {
50 b2cfc4e2 2003-09-30 devnull 	char *syserr;
51 b2cfc4e2 2003-09-30 devnull 
52 b2cfc4e2 2003-09-30 devnull 	syserr = getsyserr();
53 66c10f02 2005-01-04 devnull 	if(errno == EINTR)
54 66c10f02 2005-01-04 devnull 		strcpy(syserr, "interrupted");
55 66c10f02 2005-01-04 devnull 	else if(errno != EPLAN9)
56 b2cfc4e2 2003-09-30 devnull 		strcpy(syserr, strerror(errno));
57 b2cfc4e2 2003-09-30 devnull 	strecpy(err, err+n, syserr);
58 b2cfc4e2 2003-09-30 devnull }
59 b2cfc4e2 2003-09-30 devnull 
60 b2cfc4e2 2003-09-30 devnull /* replaces __errfmt in libfmt */
61 b2cfc4e2 2003-09-30 devnull 
62 b2cfc4e2 2003-09-30 devnull int
63 b2cfc4e2 2003-09-30 devnull __errfmt(Fmt *f)
64 b2cfc4e2 2003-09-30 devnull {
65 b2cfc4e2 2003-09-30 devnull 	if(errno == EPLAN9)
66 b2cfc4e2 2003-09-30 devnull 		return fmtstrcpy(f, getsyserr());
67 b2cfc4e2 2003-09-30 devnull 	return fmtstrcpy(f, strerror(errno));
68 b2cfc4e2 2003-09-30 devnull }
69 169aba14 2003-10-14 devnull 
70 169aba14 2003-10-14 devnull void
71 169aba14 2003-10-14 devnull werrstr(char *fmt, ...)
72 169aba14 2003-10-14 devnull {
73 169aba14 2003-10-14 devnull 	va_list arg;
74 169aba14 2003-10-14 devnull 	char buf[ERRMAX];
75 169aba14 2003-10-14 devnull 
76 169aba14 2003-10-14 devnull 	va_start(arg, fmt);
77 169aba14 2003-10-14 devnull 	vseprint(buf, buf+ERRMAX, fmt, arg);
78 169aba14 2003-10-14 devnull 	va_end(arg);
79 169aba14 2003-10-14 devnull 	errstr(buf, ERRMAX);
80 169aba14 2003-10-14 devnull }