xref: /onnv-gate/usr/src/lib/libshell/common/bltins/poll_solaris.c (revision 10898:1883b621b3ea)
1*10898Sroland.mainz@nrubsig.org /***********************************************************************
2*10898Sroland.mainz@nrubsig.org *                                                                      *
3*10898Sroland.mainz@nrubsig.org *               This software is part of the ast package               *
4*10898Sroland.mainz@nrubsig.org *          Copyright (c) 1982-2009 AT&T Intellectual Property          *
5*10898Sroland.mainz@nrubsig.org *                      and is licensed under the                       *
6*10898Sroland.mainz@nrubsig.org *                  Common Public License, Version 1.0                  *
7*10898Sroland.mainz@nrubsig.org *                    by AT&T Intellectual Property                     *
8*10898Sroland.mainz@nrubsig.org *                                                                      *
9*10898Sroland.mainz@nrubsig.org *                A copy of the License is available at                 *
10*10898Sroland.mainz@nrubsig.org *            http://www.opensource.org/licenses/cpl1.0.txt             *
11*10898Sroland.mainz@nrubsig.org *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*10898Sroland.mainz@nrubsig.org *                                                                      *
13*10898Sroland.mainz@nrubsig.org *              Information and Software Systems Research               *
14*10898Sroland.mainz@nrubsig.org *                            AT&T Research                             *
15*10898Sroland.mainz@nrubsig.org *                           Florham Park NJ                            *
16*10898Sroland.mainz@nrubsig.org *                                                                      *
17*10898Sroland.mainz@nrubsig.org *               Roland Mainz <roland.mainz@nrubsig.org>                *
18*10898Sroland.mainz@nrubsig.org *                                                                      *
19*10898Sroland.mainz@nrubsig.org ***********************************************************************/
20*10898Sroland.mainz@nrubsig.org #pragma prototyped
21*10898Sroland.mainz@nrubsig.org 
22*10898Sroland.mainz@nrubsig.org #include	<shell.h>
23*10898Sroland.mainz@nrubsig.org #include	<stdio.h>
24*10898Sroland.mainz@nrubsig.org #include	<stdbool.h>
25*10898Sroland.mainz@nrubsig.org #include	<option.h>
26*10898Sroland.mainz@nrubsig.org #include	<stk.h>
27*10898Sroland.mainz@nrubsig.org #include	<tm.h>
28*10898Sroland.mainz@nrubsig.org #include	"name.h"
29*10898Sroland.mainz@nrubsig.org #undef nv_isnull
30*10898Sroland.mainz@nrubsig.org #ifndef SH_DICT
31*10898Sroland.mainz@nrubsig.org #   define SH_DICT     "libshell"
32*10898Sroland.mainz@nrubsig.org #endif
33*10898Sroland.mainz@nrubsig.org #include	<poll.h>
34*10898Sroland.mainz@nrubsig.org #ifdef __GNUC__
35*10898Sroland.mainz@nrubsig.org #include <alloca.h>
36*10898Sroland.mainz@nrubsig.org #endif /* __GNUC__ */
37*10898Sroland.mainz@nrubsig.org 
38*10898Sroland.mainz@nrubsig.org #define sh_contexttoshb(context)	((Shbltin_t*)(context))
39*10898Sroland.mainz@nrubsig.org #define sh_contexttoshell(context)	((context)?(sh_contexttoshb(context)->shp):(NULL))
40*10898Sroland.mainz@nrubsig.org 
41*10898Sroland.mainz@nrubsig.org static const char sh_optpoll[] =
42*10898Sroland.mainz@nrubsig.org "[-?\n@(#)$Id: poll (AT&T Labs Research) 2009-05-14 $\n]"
43*10898Sroland.mainz@nrubsig.org "[-author?Roland Mainz <roland.mainz@nrubsig.org]"
44*10898Sroland.mainz@nrubsig.org "[-license?http://www.opensource.org/licenses/cpl1.0.txt]"
45*10898Sroland.mainz@nrubsig.org "[+NAME? poll - input/output multiplexing]"
46*10898Sroland.mainz@nrubsig.org "[+DESCRIPTION?The poll command provides applications with a mechanism "
47*10898Sroland.mainz@nrubsig.org 	"for multiplexing input/output over a set of file descriptors. "
48*10898Sroland.mainz@nrubsig.org 	"For each member of the array variable \bvar\b, "
49*10898Sroland.mainz@nrubsig.org 	"poll examines the given file descriptor in the subscript \b.fd\b "
50*10898Sroland.mainz@nrubsig.org 	"for the event(s) specified in the subscript \b.events\b."
51*10898Sroland.mainz@nrubsig.org 	"The poll command identifies those file descriptors on which an "
52*10898Sroland.mainz@nrubsig.org 	"application can read or write data, or on which certain events have "
53*10898Sroland.mainz@nrubsig.org 	"occurred.]"
54*10898Sroland.mainz@nrubsig.org "[+?The \bvar\b argument specifies the file descriptors to be examined "
55*10898Sroland.mainz@nrubsig.org 	"and the events of interest for each file descriptor. "
56*10898Sroland.mainz@nrubsig.org 	"It is a array of structured variables with one member for each open "
57*10898Sroland.mainz@nrubsig.org 	"file descriptor of interest. The array's members contain the following "
58*10898Sroland.mainz@nrubsig.org 	"subscripts:]{"
59*10898Sroland.mainz@nrubsig.org 		"[+?\b.fd\b       # file descriptor]"
60*10898Sroland.mainz@nrubsig.org 		"[+?\b.events\b   # requested events]"
61*10898Sroland.mainz@nrubsig.org 		"[+?\b.revents\b  # returned event]"
62*10898Sroland.mainz@nrubsig.org 	"}"
63*10898Sroland.mainz@nrubsig.org "[+?The \bfd\b variable specifies an open file descriptor and the "
64*10898Sroland.mainz@nrubsig.org 	"\bevents\b and \brevents\b members are strings constructed from "
65*10898Sroland.mainz@nrubsig.org 	"a concaternation of the following event flags, seperated by '|':]"
66*10898Sroland.mainz@nrubsig.org 	"{ "
67*10898Sroland.mainz@nrubsig.org 	"[+POLLIN?Data other than high priority data may be "
68*10898Sroland.mainz@nrubsig.org 		"read without blocking. For STREAMS, this "
69*10898Sroland.mainz@nrubsig.org 		"flag is set in revents even if the message "
70*10898Sroland.mainz@nrubsig.org 		"is of zero length.]"
71*10898Sroland.mainz@nrubsig.org 	"[+POLLRDNORM?Normal data (priority band equals 0) may be "
72*10898Sroland.mainz@nrubsig.org 		"read without blocking. For STREAMS, this "
73*10898Sroland.mainz@nrubsig.org 		"flag is set in revents even if the message "
74*10898Sroland.mainz@nrubsig.org 		"is of zero length.]"
75*10898Sroland.mainz@nrubsig.org 	"[+POLLRDBAND?Data from a non-zero priority band may be "
76*10898Sroland.mainz@nrubsig.org 		"read without blocking. For STREAMS, this "
77*10898Sroland.mainz@nrubsig.org 		"flag is set in revents even if the message "
78*10898Sroland.mainz@nrubsig.org 		"is of zero length.]"
79*10898Sroland.mainz@nrubsig.org 	"[+POLLPRI?High priority data may be received without "
80*10898Sroland.mainz@nrubsig.org 		"blocking. For STREAMS, this flag is set in "
81*10898Sroland.mainz@nrubsig.org 		"revents even if the message is of zero "
82*10898Sroland.mainz@nrubsig.org 		"length.]"
83*10898Sroland.mainz@nrubsig.org 	"[+POLLOUT?Normal data (priority band equals 0) may be "
84*10898Sroland.mainz@nrubsig.org 		"written without blocking.]"
85*10898Sroland.mainz@nrubsig.org 	"[+POLLWRNORM?The same as POLLOUT.]"
86*10898Sroland.mainz@nrubsig.org 	"[+POLLWRBAND?Priority data (priority band > 0) may be "
87*10898Sroland.mainz@nrubsig.org 		"written.  This event only examines bands "
88*10898Sroland.mainz@nrubsig.org 		"that have been written to at least once.]"
89*10898Sroland.mainz@nrubsig.org 	"[+POLLERR?An error has occurred on the device or "
90*10898Sroland.mainz@nrubsig.org 		"stream.  This flag is only valid in the "
91*10898Sroland.mainz@nrubsig.org 		"revents bitmask; it is not used in the "
92*10898Sroland.mainz@nrubsig.org 		"events member.]"
93*10898Sroland.mainz@nrubsig.org 	"[+POLLHUP?A hangup has occurred on the stream. This "
94*10898Sroland.mainz@nrubsig.org 		"event and POLLOUT are mutually exclusive; a "
95*10898Sroland.mainz@nrubsig.org 		"stream can never be writable if a hangup has "
96*10898Sroland.mainz@nrubsig.org 		"occurred. However, this event and POLLIN, "
97*10898Sroland.mainz@nrubsig.org 		", POLLRDBAND, or POLLPRI are not "
98*10898Sroland.mainz@nrubsig.org 		"mutually exclusive. This flag is only valid "
99*10898Sroland.mainz@nrubsig.org 		"in the revents bitmask; it is not used in "
100*10898Sroland.mainz@nrubsig.org 		"the events member.]"
101*10898Sroland.mainz@nrubsig.org 	"[+POLLNVAL?The specified fd value does not belong to an "
102*10898Sroland.mainz@nrubsig.org 		"open file. This flag is only valid in the "
103*10898Sroland.mainz@nrubsig.org 		"revents member; it is not used in the events "
104*10898Sroland.mainz@nrubsig.org 		"member.]"
105*10898Sroland.mainz@nrubsig.org    "}"
106*10898Sroland.mainz@nrubsig.org "]"
107*10898Sroland.mainz@nrubsig.org 
108*10898Sroland.mainz@nrubsig.org "[+?If the value fd is less than 0, events is ignored and "
109*10898Sroland.mainz@nrubsig.org 	"revents is set to 0 in that entry on return from poll.]"
110*10898Sroland.mainz@nrubsig.org 
111*10898Sroland.mainz@nrubsig.org "[+?The results of the poll query are stored in the revents "
112*10898Sroland.mainz@nrubsig.org 	"member in the \bvar\b structure. POLL*-strings are set in the \brevents\b "
113*10898Sroland.mainz@nrubsig.org 	"variable to indicate which of the requested events are true. "
114*10898Sroland.mainz@nrubsig.org 	"If none are true, the \brevents\b will be an empty string when "
115*10898Sroland.mainz@nrubsig.org 	"the poll command returns. The event flags "
116*10898Sroland.mainz@nrubsig.org 	"POLLHUP, POLLERR, and POLLNVAL are always set in \brevents\b "
117*10898Sroland.mainz@nrubsig.org 	"if the conditions they indicate are true; this occurs even "
118*10898Sroland.mainz@nrubsig.org 	"though these flags were not present in events.]"
119*10898Sroland.mainz@nrubsig.org 
120*10898Sroland.mainz@nrubsig.org "[+?If none of the defined events have occurred on any selected "
121*10898Sroland.mainz@nrubsig.org 	"file descriptor, poll waits at least timeout milliseconds "
122*10898Sroland.mainz@nrubsig.org 	"for an event to occur on any of the selected file descriptors. "
123*10898Sroland.mainz@nrubsig.org 	"On a computer where millisecond timing accuracy is not "
124*10898Sroland.mainz@nrubsig.org 	"available, timeout is rounded up to the nearest legal value "
125*10898Sroland.mainz@nrubsig.org 	"available on that system. If the value timeout is 0, poll "
126*10898Sroland.mainz@nrubsig.org 	"returns immediately. If the value of timeout is -1, poll "
127*10898Sroland.mainz@nrubsig.org 	"blocks until a requested event occurs or until the call is "
128*10898Sroland.mainz@nrubsig.org 	"interrupted.]"
129*10898Sroland.mainz@nrubsig.org 
130*10898Sroland.mainz@nrubsig.org "[+?The poll function supports regular files, terminal and "
131*10898Sroland.mainz@nrubsig.org 	"pseudo-terminal devices, STREAMS-based files, FIFOs and "
132*10898Sroland.mainz@nrubsig.org 	"pipes. The behavior of poll on elements of fds that refer "
133*10898Sroland.mainz@nrubsig.org 	"to other types of file is unspecified.]"
134*10898Sroland.mainz@nrubsig.org 
135*10898Sroland.mainz@nrubsig.org "[+?The poll function supports sockets.]"
136*10898Sroland.mainz@nrubsig.org 
137*10898Sroland.mainz@nrubsig.org "[+?A file descriptor for a socket that is listening for connections "
138*10898Sroland.mainz@nrubsig.org 	"will indicate that it is ready for reading, once connections "
139*10898Sroland.mainz@nrubsig.org 	"are available. A file descriptor for a socket that "
140*10898Sroland.mainz@nrubsig.org 	"is connecting asynchronously will indicate that it is ready "
141*10898Sroland.mainz@nrubsig.org 	"for writing, once a connection has been established.]"
142*10898Sroland.mainz@nrubsig.org 
143*10898Sroland.mainz@nrubsig.org "[+?Regular files always poll TRUE for reading and writing.]"
144*10898Sroland.mainz@nrubsig.org 
145*10898Sroland.mainz@nrubsig.org "[e:eventarray]:[fdcount?Upon successful completion, an indexed array "
146*10898Sroland.mainz@nrubsig.org 	"of strings is returned which contains a list of array subscripts "
147*10898Sroland.mainz@nrubsig.org 	"in the poll array which received events.]"
148*10898Sroland.mainz@nrubsig.org "[t:timeout]:[seconds?Timeout in seconds. If the value timeout is 0, "
149*10898Sroland.mainz@nrubsig.org 	"poll returns immediately. If the value of timeout is -1, poll "
150*10898Sroland.mainz@nrubsig.org 	"blocks until a requested event occurs or until the call is "
151*10898Sroland.mainz@nrubsig.org 	"interrupted.]"
152*10898Sroland.mainz@nrubsig.org "[T:mtimeout]:[milliseconds?Timeout in milliseconds. If the value timeout is 0, "
153*10898Sroland.mainz@nrubsig.org 	"poll returns immediately. If the value of timeout is -1, poll "
154*10898Sroland.mainz@nrubsig.org 	"blocks until a requested event occurs or until the call is "
155*10898Sroland.mainz@nrubsig.org 	"interrupted.]"
156*10898Sroland.mainz@nrubsig.org "\n"
157*10898Sroland.mainz@nrubsig.org "\nvar\n"
158*10898Sroland.mainz@nrubsig.org "\n"
159*10898Sroland.mainz@nrubsig.org "[+EXIT STATUS?]{"
160*10898Sroland.mainz@nrubsig.org         "[+0?Success.]"
161*10898Sroland.mainz@nrubsig.org         "[+>0?An error occurred.]"
162*10898Sroland.mainz@nrubsig.org "}"
163*10898Sroland.mainz@nrubsig.org "[+SEE ALSO?\bopen\b(1),\btmpfile\b(1),\bdup\b(1),\bclose\b(1),\bpoll\b(2)]"
164*10898Sroland.mainz@nrubsig.org ;
165*10898Sroland.mainz@nrubsig.org 
166*10898Sroland.mainz@nrubsig.org /*
167*10898Sroland.mainz@nrubsig.org  * |mystpcpy| - like |strcpy()| but returns the end of the buffer
168*10898Sroland.mainz@nrubsig.org  *
169*10898Sroland.mainz@nrubsig.org  * Copy string s2 to s1.  s1 must be large enough.
170*10898Sroland.mainz@nrubsig.org  * return s1-1 (position of string terminator ('\0') in destnation buffer).
171*10898Sroland.mainz@nrubsig.org  */
172*10898Sroland.mainz@nrubsig.org static
mystpcpy(char * s1,const char * s2)173*10898Sroland.mainz@nrubsig.org char *mystpcpy(char *s1, const char *s2)
174*10898Sroland.mainz@nrubsig.org {
175*10898Sroland.mainz@nrubsig.org         while (*s1++ = *s2++)
176*10898Sroland.mainz@nrubsig.org                 ;
177*10898Sroland.mainz@nrubsig.org         return (s1-1);
178*10898Sroland.mainz@nrubsig.org }
179*10898Sroland.mainz@nrubsig.org 
180*10898Sroland.mainz@nrubsig.org static
nv_open_fmt(Dt_t * dict,int flags,const char * namefmt,...)181*10898Sroland.mainz@nrubsig.org Namval_t *nv_open_fmt(Dt_t *dict, int flags, const char *namefmt, ...)
182*10898Sroland.mainz@nrubsig.org {
183*10898Sroland.mainz@nrubsig.org 	char 	varnamebuff[PATH_MAX];
184*10898Sroland.mainz@nrubsig.org 	va_list	ap;
185*10898Sroland.mainz@nrubsig.org 
186*10898Sroland.mainz@nrubsig.org 	va_start(ap, namefmt);
187*10898Sroland.mainz@nrubsig.org 	vsnprintf(varnamebuff, sizeof(varnamebuff), namefmt, ap);
188*10898Sroland.mainz@nrubsig.org 	va_end(ap);
189*10898Sroland.mainz@nrubsig.org 
190*10898Sroland.mainz@nrubsig.org 	return nv_open(varnamebuff, dict, flags);
191*10898Sroland.mainz@nrubsig.org }
192*10898Sroland.mainz@nrubsig.org 
193*10898Sroland.mainz@nrubsig.org static
poll_strtoevents(const char * str)194*10898Sroland.mainz@nrubsig.org int poll_strtoevents(const char *str)
195*10898Sroland.mainz@nrubsig.org {
196*10898Sroland.mainz@nrubsig.org 	int events = 0;
197*10898Sroland.mainz@nrubsig.org 
198*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLIN"))     events |= POLLIN;
199*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLRDNORM")) events |= POLLRDNORM;
200*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLRDBAND")) events |= POLLRDBAND;
201*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLPRI"))    events |= POLLPRI;
202*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLOUT"))    events |= POLLOUT;
203*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLWRNORM")) events |= POLLWRNORM;
204*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLWRBAND")) events |= POLLWRBAND;
205*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLERR"))    events |= POLLERR;
206*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLHUP"))    events |= POLLHUP;
207*10898Sroland.mainz@nrubsig.org 	if (strstr(str, "POLLNVAL"))   events |= POLLNVAL;
208*10898Sroland.mainz@nrubsig.org 
209*10898Sroland.mainz@nrubsig.org 	return events;
210*10898Sroland.mainz@nrubsig.org }
211*10898Sroland.mainz@nrubsig.org 
212*10898Sroland.mainz@nrubsig.org 
213*10898Sroland.mainz@nrubsig.org static
poll_eventstostr(char * s,int events)214*10898Sroland.mainz@nrubsig.org void poll_eventstostr(char *s, int events)
215*10898Sroland.mainz@nrubsig.org {
216*10898Sroland.mainz@nrubsig.org 	*s='\0';
217*10898Sroland.mainz@nrubsig.org 	if (!events)
218*10898Sroland.mainz@nrubsig.org 		return;
219*10898Sroland.mainz@nrubsig.org 
220*10898Sroland.mainz@nrubsig.org 	if (events & POLLIN)		s=mystpcpy(s, "POLLIN|");
221*10898Sroland.mainz@nrubsig.org 	if (events & POLLRDNORM)	s=mystpcpy(s, "POLLRDNORM|");
222*10898Sroland.mainz@nrubsig.org 	if (events & POLLRDBAND)	s=mystpcpy(s, "POLLRDBAND|");
223*10898Sroland.mainz@nrubsig.org 	if (events & POLLPRI)		s=mystpcpy(s, "POLLPRI|");
224*10898Sroland.mainz@nrubsig.org 	if (events & POLLOUT)		s=mystpcpy(s, "POLLOUT|");
225*10898Sroland.mainz@nrubsig.org 	if (events & POLLWRNORM)	s=mystpcpy(s, "POLLWRNORM|");
226*10898Sroland.mainz@nrubsig.org 	if (events & POLLWRBAND)	s=mystpcpy(s, "POLLWRBAND|");
227*10898Sroland.mainz@nrubsig.org 	if (events & POLLERR)		s=mystpcpy(s, "POLLERR|");
228*10898Sroland.mainz@nrubsig.org 	if (events & POLLHUP)		s=mystpcpy(s, "POLLHUP|");
229*10898Sroland.mainz@nrubsig.org 	if (events & POLLNVAL)		s=mystpcpy(s, "POLLNVAL|");
230*10898Sroland.mainz@nrubsig.org 
231*10898Sroland.mainz@nrubsig.org 	/* Remove trailling '|' */
232*10898Sroland.mainz@nrubsig.org 	s--;
233*10898Sroland.mainz@nrubsig.org 	if(*s=='|')
234*10898Sroland.mainz@nrubsig.org 		*s='\0';
235*10898Sroland.mainz@nrubsig.org }
236*10898Sroland.mainz@nrubsig.org 
237*10898Sroland.mainz@nrubsig.org #undef  getconf
238*10898Sroland.mainz@nrubsig.org #define getconf(x)      strtol(astconf(x,NiL,NiL),NiL,0)
239*10898Sroland.mainz@nrubsig.org 
b_poll(int argc,char * argv[],void * extra)240*10898Sroland.mainz@nrubsig.org extern int b_poll(int argc, char *argv[], void *extra)
241*10898Sroland.mainz@nrubsig.org {
242*10898Sroland.mainz@nrubsig.org 	Namval_t *np;
243*10898Sroland.mainz@nrubsig.org 	Shell_t *shp = sh_contexttoshell(extra);
244*10898Sroland.mainz@nrubsig.org 	char *varname;
245*10898Sroland.mainz@nrubsig.org 	int n;
246*10898Sroland.mainz@nrubsig.org 	int fd;
247*10898Sroland.mainz@nrubsig.org 	nfds_t numpollfd = 0;
248*10898Sroland.mainz@nrubsig.org 	int i;
249*10898Sroland.mainz@nrubsig.org 	char *s;
250*10898Sroland.mainz@nrubsig.org 	double timeout = -1.;
251*10898Sroland.mainz@nrubsig.org 	char buff[PATH_MAX*2+1]; /* enogth to hold two variable names */
252*10898Sroland.mainz@nrubsig.org 	char *eventarrayname = NULL;
253*10898Sroland.mainz@nrubsig.org 
254*10898Sroland.mainz@nrubsig.org 	while (n = optget(argv, sh_optpoll)) switch (n)
255*10898Sroland.mainz@nrubsig.org 	{
256*10898Sroland.mainz@nrubsig.org 	    case 't':
257*10898Sroland.mainz@nrubsig.org 	    case 'T':
258*10898Sroland.mainz@nrubsig.org 		errno = 0;
259*10898Sroland.mainz@nrubsig.org 		timeout = strtod(opt_info.arg, (char **)NULL);
260*10898Sroland.mainz@nrubsig.org 		if (errno != 0)
261*10898Sroland.mainz@nrubsig.org 			errormsg(SH_DICT, ERROR_system(1), "%s: invalid timeout", opt_info.arg);
262*10898Sroland.mainz@nrubsig.org 
263*10898Sroland.mainz@nrubsig.org 		/* -t uses seconds, -T milliseconds */
264*10898Sroland.mainz@nrubsig.org 		if (n == 't')
265*10898Sroland.mainz@nrubsig.org 			timeout *= 1000.;
266*10898Sroland.mainz@nrubsig.org 		break;
267*10898Sroland.mainz@nrubsig.org 	    case 'e':
268*10898Sroland.mainz@nrubsig.org 	    	eventarrayname = opt_info.arg;
269*10898Sroland.mainz@nrubsig.org 		break;
270*10898Sroland.mainz@nrubsig.org 	    case ':':
271*10898Sroland.mainz@nrubsig.org 		errormsg(SH_DICT, 2, "%s", opt_info.arg);
272*10898Sroland.mainz@nrubsig.org 		break;
273*10898Sroland.mainz@nrubsig.org 	    case '?':
274*10898Sroland.mainz@nrubsig.org 		errormsg(SH_DICT, ERROR_usage(2), "%s", opt_info.arg);
275*10898Sroland.mainz@nrubsig.org 		break;
276*10898Sroland.mainz@nrubsig.org 	}
277*10898Sroland.mainz@nrubsig.org 	argc -= opt_info.index;
278*10898Sroland.mainz@nrubsig.org 	argv += opt_info.index;
279*10898Sroland.mainz@nrubsig.org 	if(argc!=1)
280*10898Sroland.mainz@nrubsig.org 		errormsg(SH_DICT, ERROR_usage(2), optusage((char*)0));
281*10898Sroland.mainz@nrubsig.org 
282*10898Sroland.mainz@nrubsig.org         varname = argv[0];
283*10898Sroland.mainz@nrubsig.org 
284*10898Sroland.mainz@nrubsig.org 	Namval_t *array_np, *array_np_sub;
285*10898Sroland.mainz@nrubsig.org 	const char *subname;
286*10898Sroland.mainz@nrubsig.org 
287*10898Sroland.mainz@nrubsig.org 	array_np = nv_open(varname, shp->var_tree, NV_NOFAIL|NV_NOADD);
288*10898Sroland.mainz@nrubsig.org 	if (!array_np)
289*10898Sroland.mainz@nrubsig.org 		errormsg(SH_DICT, ERROR_system(1), "cannot find array variable %s", varname);
290*10898Sroland.mainz@nrubsig.org 	if(!nv_isattr(array_np, NV_ARRAY))
291*10898Sroland.mainz@nrubsig.org 		errormsg(SH_DICT, ERROR_system(1), "variable %s is not an array", varname);
292*10898Sroland.mainz@nrubsig.org 
293*10898Sroland.mainz@nrubsig.org 	/* Count number of array elememts. We need to do it "manually" to
294*10898Sroland.mainz@nrubsig.org 	 * handle sparse indexed and associative arrays */
295*10898Sroland.mainz@nrubsig.org 	nv_putsub(array_np, NULL, ARRAY_SCAN);
296*10898Sroland.mainz@nrubsig.org 	array_np_sub = array_np;
297*10898Sroland.mainz@nrubsig.org 	do
298*10898Sroland.mainz@nrubsig.org 	{
299*10898Sroland.mainz@nrubsig.org 		if (!(subname=nv_getsub(array_np_sub)))
300*10898Sroland.mainz@nrubsig.org 			break;
301*10898Sroland.mainz@nrubsig.org 		numpollfd++;
302*10898Sroland.mainz@nrubsig.org 	} while( array_np_sub && nv_nextsub(array_np_sub) );
303*10898Sroland.mainz@nrubsig.org 
304*10898Sroland.mainz@nrubsig.org #ifdef __GNUC__
305*10898Sroland.mainz@nrubsig.org         /*
306*10898Sroland.mainz@nrubsig.org          * Allocate stack space via |alloca()| for gcc builds since ctfconvert
307*10898Sroland.mainz@nrubsig.org          * is unable to handle VLAs from gcc. We need this until CR #6379193
308*10898Sroland.mainz@nrubsig.org 	 * is fixed.
309*10898Sroland.mainz@nrubsig.org          */
310*10898Sroland.mainz@nrubsig.org 	struct pollfd *pollfd = alloca(sizeof(struct pollfd)*(numpollfd+1));
311*10898Sroland.mainz@nrubsig.org #else
312*10898Sroland.mainz@nrubsig.org 	/* We must allocate one more entry with VLA with zero elements do not work with all compilers */
313*10898Sroland.mainz@nrubsig.org 	struct pollfd pollfd[numpollfd+1];
314*10898Sroland.mainz@nrubsig.org #endif /* __GNUC__ */
315*10898Sroland.mainz@nrubsig.org 
316*10898Sroland.mainz@nrubsig.org 	nv_putsub(array_np, NULL, ARRAY_SCAN);
317*10898Sroland.mainz@nrubsig.org 	array_np_sub = array_np;
318*10898Sroland.mainz@nrubsig.org 	i = 0;
319*10898Sroland.mainz@nrubsig.org 	do
320*10898Sroland.mainz@nrubsig.org 	{
321*10898Sroland.mainz@nrubsig.org 		if (!(subname=nv_getsub(array_np_sub)))
322*10898Sroland.mainz@nrubsig.org 			break;
323*10898Sroland.mainz@nrubsig.org 
324*10898Sroland.mainz@nrubsig.org 		np = nv_open_fmt(shp->var_tree, NV_NOFAIL|NV_NOADD, "%s[%s].fd", varname, subname);
325*10898Sroland.mainz@nrubsig.org 		if (!np)
326*10898Sroland.mainz@nrubsig.org 			errormsg(SH_DICT, ERROR_system(1), "missing pollfd %s[%s].fd", varname, subname);
327*10898Sroland.mainz@nrubsig.org 		fd = (int)nv_getnum(np);
328*10898Sroland.mainz@nrubsig.org 		if (fd < 0 || fd > OPEN_MAX)
329*10898Sroland.mainz@nrubsig.org 			errormsg(SH_DICT, ERROR_system(1), "invalid pollfd fd %d", fd);
330*10898Sroland.mainz@nrubsig.org 		nv_close(np);
331*10898Sroland.mainz@nrubsig.org 		pollfd[i].fd = fd;
332*10898Sroland.mainz@nrubsig.org 
333*10898Sroland.mainz@nrubsig.org 		np = nv_open_fmt(shp->var_tree, NV_NOFAIL|NV_NOADD, "%s[%s].events", varname, subname);
334*10898Sroland.mainz@nrubsig.org 		if (!np)
335*10898Sroland.mainz@nrubsig.org 			errormsg(SH_DICT, ERROR_system(1), "missing pollfd %s[%s].events", varname, subname);
336*10898Sroland.mainz@nrubsig.org 
337*10898Sroland.mainz@nrubsig.org 		s = nv_getval(np);
338*10898Sroland.mainz@nrubsig.org 		if (!s)
339*10898Sroland.mainz@nrubsig.org 			errormsg(SH_DICT, ERROR_system(1), "missing pollfd events value");
340*10898Sroland.mainz@nrubsig.org 		pollfd[i].events  = poll_strtoevents(s);
341*10898Sroland.mainz@nrubsig.org 		nv_close(np);
342*10898Sroland.mainz@nrubsig.org 
343*10898Sroland.mainz@nrubsig.org 		pollfd[i].revents = 0;
344*10898Sroland.mainz@nrubsig.org 
345*10898Sroland.mainz@nrubsig.org 		i++;
346*10898Sroland.mainz@nrubsig.org 	} while( array_np_sub && nv_nextsub(array_np_sub) );
347*10898Sroland.mainz@nrubsig.org 
348*10898Sroland.mainz@nrubsig.org 	n = poll(pollfd, numpollfd, timeout);
349*10898Sroland.mainz@nrubsig.org 	/* FixMe: EGAIN and EINTR may require extra handling */
350*10898Sroland.mainz@nrubsig.org 	if (n < 0)
351*10898Sroland.mainz@nrubsig.org 		errormsg(SH_DICT, ERROR_system(1), "failure");
352*10898Sroland.mainz@nrubsig.org 
353*10898Sroland.mainz@nrubsig.org 	if (eventarrayname)
354*10898Sroland.mainz@nrubsig.org 	{
355*10898Sroland.mainz@nrubsig.org 		np = nv_open_fmt(shp->var_tree, NV_VARNAME|NV_ARRAY|NV_NOFAIL, "%s", eventarrayname);
356*10898Sroland.mainz@nrubsig.org 		if (!np)
357*10898Sroland.mainz@nrubsig.org 			errormsg(SH_DICT, ERROR_system(1), "couldn't create poll count variable %s", eventarrayname);
358*10898Sroland.mainz@nrubsig.org 		nv_close(np);
359*10898Sroland.mainz@nrubsig.org 	}
360*10898Sroland.mainz@nrubsig.org 
361*10898Sroland.mainz@nrubsig.org 	nv_putsub(array_np, NULL, ARRAY_SCAN);
362*10898Sroland.mainz@nrubsig.org 	array_np_sub = array_np;
363*10898Sroland.mainz@nrubsig.org 	i = 0;
364*10898Sroland.mainz@nrubsig.org 	do
365*10898Sroland.mainz@nrubsig.org 	{
366*10898Sroland.mainz@nrubsig.org 		if (!(subname=nv_getsub(array_np_sub)))
367*10898Sroland.mainz@nrubsig.org 			break;
368*10898Sroland.mainz@nrubsig.org 
369*10898Sroland.mainz@nrubsig.org 		np = nv_open_fmt(shp->var_tree, NV_NOFAIL, "%s[%s].revents", varname, subname);
370*10898Sroland.mainz@nrubsig.org 		if (!np)
371*10898Sroland.mainz@nrubsig.org 			errormsg(SH_DICT, ERROR_system(1), "couldn't create pollfd %s[%s].revents", varname, subname);
372*10898Sroland.mainz@nrubsig.org 
373*10898Sroland.mainz@nrubsig.org 		poll_eventstostr(buff, pollfd[i].revents);
374*10898Sroland.mainz@nrubsig.org 
375*10898Sroland.mainz@nrubsig.org 		nv_putval(np, buff, 0);
376*10898Sroland.mainz@nrubsig.org 		nv_close(np);
377*10898Sroland.mainz@nrubsig.org 
378*10898Sroland.mainz@nrubsig.org 		if (eventarrayname && pollfd[i].revents)
379*10898Sroland.mainz@nrubsig.org 		{
380*10898Sroland.mainz@nrubsig.org 			sprintf(buff, "%s+=( '%s' )", eventarrayname, subname);
381*10898Sroland.mainz@nrubsig.org 			sh_trap(buff, 0);
382*10898Sroland.mainz@nrubsig.org 		}
383*10898Sroland.mainz@nrubsig.org 
384*10898Sroland.mainz@nrubsig.org 		i++;
385*10898Sroland.mainz@nrubsig.org 	} while( array_np_sub && nv_nextsub(array_np_sub) );
386*10898Sroland.mainz@nrubsig.org 
387*10898Sroland.mainz@nrubsig.org 	nv_close(array_np);
388*10898Sroland.mainz@nrubsig.org 
389*10898Sroland.mainz@nrubsig.org 	return(0);
390*10898Sroland.mainz@nrubsig.org }
391