| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: netproc.c,v 2.15 2004/03/26 21:36:19 schorsch Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Parallel network process handling routines |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <stdlib.h> |
| 9 |
#include <stdio.h> |
| 10 |
#include <string.h> |
| 11 |
#include <signal.h> |
| 12 |
#include <fcntl.h> |
| 13 |
#include <unistd.h> |
| 14 |
#include <sys/wait.h> |
| 15 |
|
| 16 |
#include "rtmisc.h" |
| 17 |
#include "selcall.h" |
| 18 |
#include "netproc.h" |
| 19 |
#include "paths.h" |
| 20 |
|
| 21 |
PSERVER *pslist = NULL; /* global process server list */ |
| 22 |
|
| 23 |
static NETPROC *pindex[FD_SETSIZE]; /* process index table */ |
| 24 |
|
| 25 |
static char ourhost[64]; /* this host name */ |
| 26 |
static char ourdir[PATH_MAX]; /* our working directory */ |
| 27 |
static char ouruser[32]; /* our user name */ |
| 28 |
static char *ourshell; /* our user's shell */ |
| 29 |
|
| 30 |
static fd_set errdesc; /* error file descriptors */ |
| 31 |
static int maxfd; /* maximum assigned descriptor */ |
| 32 |
|
| 33 |
extern char *remsh; /* externally defined remote shell program */ |
| 34 |
|
| 35 |
static int readerrs(int fd); |
| 36 |
static void wait4end(void); |
| 37 |
static int finishjob(PSERVER *ps, int pn, int status); |
| 38 |
|
| 39 |
|
| 40 |
extern PSERVER * |
| 41 |
addpserver( /* add a new process server */ |
| 42 |
char *host, |
| 43 |
char *dir, |
| 44 |
char *usr, |
| 45 |
int np |
| 46 |
) |
| 47 |
{ |
| 48 |
register PSERVER *ps; |
| 49 |
/* allocate the struct */ |
| 50 |
if (np < 1) |
| 51 |
return(NULL); |
| 52 |
ps = (PSERVER *)malloc(sizeof(PSERVER)+(np-1)*sizeof(NETPROC)); |
| 53 |
if (ps == NULL) |
| 54 |
return(NULL); |
| 55 |
if (!ourhost[0]) { /* initialize */ |
| 56 |
char dirtmp[PATH_MAX]; |
| 57 |
register char *cp; |
| 58 |
register int len; |
| 59 |
|
| 60 |
strcpy(ourhost, myhostname()); |
| 61 |
getcwd(dirtmp, sizeof(dirtmp)); |
| 62 |
if ((cp = getenv("HOME")) != NULL) { |
| 63 |
if (!strcmp(cp, dirtmp)) |
| 64 |
ourdir[0] = '\0'; |
| 65 |
else if (!strncmp(cp, dirtmp, len=strlen(cp)) && |
| 66 |
dirtmp[len] == '/') |
| 67 |
strcpy(ourdir, dirtmp+len+1); |
| 68 |
else |
| 69 |
strcpy(ourdir, dirtmp); |
| 70 |
} else |
| 71 |
strcpy(ourdir, dirtmp); |
| 72 |
if ((cp = getenv("USER")) != NULL) |
| 73 |
strcpy(ouruser, cp); |
| 74 |
if ((ourshell = getenv("SHELL")) == NULL) |
| 75 |
ourshell = "/bin/sh"; |
| 76 |
FD_ZERO(&errdesc); |
| 77 |
maxfd = -1; |
| 78 |
} |
| 79 |
/* assign host, directory, user */ |
| 80 |
if (host == NULL || !strcmp(host, ourhost) || |
| 81 |
!strcmp(host, LHOSTNAME)) |
| 82 |
ps->hostname[0] = '\0'; |
| 83 |
else |
| 84 |
strcpy(ps->hostname, host); |
| 85 |
if (dir == NULL) |
| 86 |
strcpy(ps->directory, ourdir); |
| 87 |
else |
| 88 |
strcpy(ps->directory, dir); |
| 89 |
if (usr == NULL || !strcmp(usr, ouruser)) |
| 90 |
ps->username[0] = '\0'; |
| 91 |
else |
| 92 |
strcpy(ps->username, usr); |
| 93 |
/* clear process slots */ |
| 94 |
ps->nprocs = np; |
| 95 |
while (np--) { |
| 96 |
ps->proc[np].com = NULL; |
| 97 |
ps->proc[np].pid = -1; |
| 98 |
ps->proc[np].efd = -1; |
| 99 |
ps->proc[np].errs = NULL; |
| 100 |
ps->proc[np].elen = 0; |
| 101 |
ps->proc[np].cf = NULL; |
| 102 |
} |
| 103 |
/* insert in our list */ |
| 104 |
ps->next = pslist; |
| 105 |
pslist = ps; |
| 106 |
/* check for signs of life */ |
| 107 |
if (!pserverOK(ps)) { |
| 108 |
delpserver(ps); /* failure -- abort */ |
| 109 |
return(NULL); |
| 110 |
} |
| 111 |
return(ps); |
| 112 |
} |
| 113 |
|
| 114 |
|
| 115 |
extern void |
| 116 |
delpserver( /* delete a process server */ |
| 117 |
PSERVER *ps |
| 118 |
) |
| 119 |
{ |
| 120 |
PSERVER pstart; |
| 121 |
register PSERVER *psp; |
| 122 |
register int i; |
| 123 |
/* find server in our list */ |
| 124 |
pstart.next = pslist; |
| 125 |
for (psp = &pstart; ps != psp->next; psp = psp->next) |
| 126 |
if (psp->next == NULL) |
| 127 |
return; /* not in our list! */ |
| 128 |
/* kill any running jobs */ |
| 129 |
for (i = 0; i < ps->nprocs; i++) |
| 130 |
if (ps->proc[i].com != NULL) { |
| 131 |
kill(SIGTERM, ps->proc[i].pid); |
| 132 |
wait4job(ps, ps->proc[i].pid); |
| 133 |
} |
| 134 |
/* remove server from list */ |
| 135 |
psp->next = ps->next; |
| 136 |
pslist = pstart.next; |
| 137 |
free((void *)ps); /* free associated memory */ |
| 138 |
} |
| 139 |
|
| 140 |
|
| 141 |
extern PSERVER * |
| 142 |
findjob( /* find out where process is running */ |
| 143 |
register int *pnp /* modified */ |
| 144 |
) |
| 145 |
{ |
| 146 |
register PSERVER *ps; |
| 147 |
register int i; |
| 148 |
|
| 149 |
for (ps = pslist; ps != NULL; ps = ps->next) |
| 150 |
for (i = 0; i < ps->nprocs; i++) |
| 151 |
if (ps->proc[i].pid == *pnp) { |
| 152 |
*pnp = i; |
| 153 |
return(ps); |
| 154 |
} |
| 155 |
return(NULL); /* not found */ |
| 156 |
} |
| 157 |
|
| 158 |
|
| 159 |
extern int |
| 160 |
startjob( /* start a job on a process server */ |
| 161 |
register PSERVER *ps, |
| 162 |
char *command, |
| 163 |
pscompfunc *compf |
| 164 |
) |
| 165 |
{ |
| 166 |
char udirt[PATH_MAX]; |
| 167 |
char *av[16]; |
| 168 |
int pfd[2], pid; |
| 169 |
register int i; |
| 170 |
|
| 171 |
if (ps == NULL) { /* find a server */ |
| 172 |
for (ps = pslist; ps != NULL; ps = ps->next) |
| 173 |
if ((i = startjob(ps, command, compf)) != -1) |
| 174 |
return(i); /* got one */ |
| 175 |
return(-1); /* no slots anywhere */ |
| 176 |
} |
| 177 |
for (i = 0; i < ps->nprocs; i++) |
| 178 |
if (ps->proc[i].com == NULL) |
| 179 |
break; |
| 180 |
if (i >= ps->nprocs) |
| 181 |
return(-1); /* out of process slots */ |
| 182 |
/* open pipe */ |
| 183 |
if (pipe(pfd) < 0) { |
| 184 |
perror("cannot open pipe"); |
| 185 |
exit(1); |
| 186 |
} |
| 187 |
/* start child process */ |
| 188 |
if ((pid = fork()) == 0) { |
| 189 |
close(pfd[0]); /* connect stderr to pipe */ |
| 190 |
if (pfd[1] != 2) { |
| 191 |
dup2(pfd[1], 2); |
| 192 |
close(pfd[1]); |
| 193 |
} |
| 194 |
if (ps->hostname[0]) { /* rsh command */ |
| 195 |
av[i=0] = remsh; |
| 196 |
av[++i] = ps->hostname; |
| 197 |
av[++i] = "-n"; /* no stdin */ |
| 198 |
if (ps->username[0]) { /* different user */ |
| 199 |
av[++i] = "-l"; |
| 200 |
av[++i] = ps->username; |
| 201 |
av[++i] = "cd"; |
| 202 |
udirt[0] = '~'; |
| 203 |
strcpy(udirt+1, ouruser); |
| 204 |
av[++i] = udirt; |
| 205 |
av[++i] = ";"; |
| 206 |
} |
| 207 |
if (ps->directory[0]) { /* change directory */ |
| 208 |
av[++i] = "cd"; |
| 209 |
av[++i] = ps->directory; |
| 210 |
av[++i] = ";"; |
| 211 |
} |
| 212 |
av[++i] = command; |
| 213 |
av[++i] = NULL; |
| 214 |
} else { /* shell command */ |
| 215 |
av[0] = ourshell; |
| 216 |
av[1] = "-c"; |
| 217 |
av[2] = command; |
| 218 |
av[3] = NULL; |
| 219 |
} |
| 220 |
execv(av[0], av); |
| 221 |
_exit(1); |
| 222 |
} |
| 223 |
if (pid == -1) { |
| 224 |
perror("fork failed"); |
| 225 |
exit(1); |
| 226 |
} |
| 227 |
ps->proc[i].com = command; /* assign process slot */ |
| 228 |
ps->proc[i].cf = compf; |
| 229 |
ps->proc[i].pid = pid; |
| 230 |
close(pfd[1]); /* get piped stderr file descriptor */ |
| 231 |
ps->proc[i].efd = pfd[0]; |
| 232 |
fcntl(pfd[0], F_SETFD, FD_CLOEXEC); /* set close on exec flag */ |
| 233 |
pindex[pfd[0]] = ps->proc + i; /* assign error fd index */ |
| 234 |
FD_SET(pfd[0], &errdesc); /* add to select call parameter */ |
| 235 |
if (pfd[0] > maxfd) |
| 236 |
maxfd = pfd[0]; |
| 237 |
return(pid); /* return to parent process */ |
| 238 |
} |
| 239 |
|
| 240 |
|
| 241 |
static int |
| 242 |
readerrs( /* read error output from fd */ |
| 243 |
int fd |
| 244 |
) |
| 245 |
{ |
| 246 |
char errbuf[BUFSIZ]; |
| 247 |
int nr; |
| 248 |
register NETPROC *pp; |
| 249 |
/* look up associated process */ |
| 250 |
if ((pp = pindex[fd]) == NULL) |
| 251 |
abort(); /* serious consistency error */ |
| 252 |
nr = read(fd, errbuf, BUFSIZ-1); |
| 253 |
if (nr < 0) { |
| 254 |
perror("read error"); |
| 255 |
exit(1); |
| 256 |
} |
| 257 |
if (nr == 0) /* stream closed (process finished) */ |
| 258 |
return(0); |
| 259 |
errbuf[nr] = '\0'; /* add to error buffer */ |
| 260 |
if (pp->elen == 0) |
| 261 |
pp->errs = (char *)malloc(nr+1); |
| 262 |
else |
| 263 |
pp->errs = (char *)realloc((void *)pp->errs, pp->elen+nr+1); |
| 264 |
if (pp->errs == NULL) { |
| 265 |
perror("malloc failed"); |
| 266 |
exit(1); |
| 267 |
} |
| 268 |
strcpy(pp->errs+pp->elen, errbuf); |
| 269 |
pp->elen += nr; |
| 270 |
return(nr); |
| 271 |
} |
| 272 |
|
| 273 |
|
| 274 |
static void |
| 275 |
wait4end(void) /* read error streams until someone is done */ |
| 276 |
{ |
| 277 |
fd_set readfds, excepfds; |
| 278 |
register int i; |
| 279 |
/* find end of descriptor set */ |
| 280 |
for ( ; maxfd >= 0; maxfd--) |
| 281 |
if (FD_ISSET(maxfd, &errdesc)) |
| 282 |
break; |
| 283 |
if (maxfd < 0) |
| 284 |
return; /* nothing to read */ |
| 285 |
readfds = excepfds = errdesc; |
| 286 |
while (select(maxfd+1, &readfds, NULL, &excepfds, NULL) > 0) |
| 287 |
for (i = 0; i <= maxfd; i++) /* get pending i/o */ |
| 288 |
if (FD_ISSET(i, &readfds) || FD_ISSET(i, &excepfds)) |
| 289 |
if (readerrs(i) == 0) |
| 290 |
return; /* finished process */ |
| 291 |
perror("select call failed"); |
| 292 |
exit(1); |
| 293 |
} |
| 294 |
|
| 295 |
|
| 296 |
static int |
| 297 |
finishjob( /* clean up finished process */ |
| 298 |
PSERVER *ps, |
| 299 |
int pn, |
| 300 |
int status |
| 301 |
) |
| 302 |
{ |
| 303 |
register NETPROC *pp; |
| 304 |
|
| 305 |
pp = ps->proc + pn; |
| 306 |
if (pp->cf != NULL) /* client cleanup */ |
| 307 |
status = (*pp->cf)(ps, pn, status); |
| 308 |
close(pp->efd); /* close error stream */ |
| 309 |
pindex[pp->efd] = NULL; |
| 310 |
FD_CLR(pp->efd, &errdesc); |
| 311 |
free((void *)pp->errs); |
| 312 |
pp->com = NULL; /* clear settings */ |
| 313 |
pp->pid = -1; |
| 314 |
pp->efd = -1; |
| 315 |
pp->errs = NULL; |
| 316 |
pp->elen = 0; |
| 317 |
pp->cf = NULL; |
| 318 |
return(status); |
| 319 |
} |
| 320 |
|
| 321 |
|
| 322 |
extern int |
| 323 |
wait4job( /* wait for process to finish */ |
| 324 |
PSERVER *ps, |
| 325 |
int pid |
| 326 |
) |
| 327 |
{ |
| 328 |
int status, psn, psn2; |
| 329 |
PSERVER *ps2; |
| 330 |
|
| 331 |
if (pid == -1) { /* wait for first job */ |
| 332 |
if (ps != NULL) { |
| 333 |
for (psn = ps->nprocs; psn--; ) |
| 334 |
if (ps->proc[psn].com != NULL) |
| 335 |
break; |
| 336 |
if (psn < 0) |
| 337 |
return(-1); /* no processes this server */ |
| 338 |
} |
| 339 |
do { |
| 340 |
wait4end(); /* wait for something to end */ |
| 341 |
if ((psn2 = wait(&status)) == -1) |
| 342 |
return(-1); /* none left */ |
| 343 |
ps2 = findjob(&psn2); |
| 344 |
if (ps2 != NULL) /* clean up job if ours */ |
| 345 |
status = finishjob(ps2, psn2, status); |
| 346 |
} while (ps2 == NULL || (ps != NULL && ps2 != ps)); |
| 347 |
return(status); /* return job status */ |
| 348 |
} |
| 349 |
psn = pid; /* else find specific job */ |
| 350 |
ps2 = findjob(&psn); /* find process slot */ |
| 351 |
if (ps2 == NULL || (ps != NULL && ps2 != ps)) |
| 352 |
return(-1); /* inconsistent target */ |
| 353 |
ps = ps2; |
| 354 |
do { |
| 355 |
wait4end(); /* wait for something to end */ |
| 356 |
if ((psn2 = wait(&status)) == -1) |
| 357 |
return(-1); /* none left */ |
| 358 |
ps2 = findjob(&psn2); |
| 359 |
if (ps2 != NULL) /* clean up job if ours */ |
| 360 |
status = finishjob(ps2, psn2, status); |
| 361 |
} while (ps2 != ps || psn2 != psn); |
| 362 |
return(status); /* return job status */ |
| 363 |
} |
