| 1 |
greg |
2.1 |
/* Copyright (c) 1996 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* Parallel network process handling routines
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <fcntl.h>
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#include "netproc.h"
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#include "vfork.h"
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/* Remote shell location */
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#ifdef sgi
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#define RSH "/usr/bsd/rsh"
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#endif
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#ifdef _AUX_SOURCE
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#define RSH "/usr/bin/remsh"
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#endif
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#ifndef RSH
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#define RSH "/usr/ucb/rsh"
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#endif
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/* select call compatibility stuff */
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#ifndef FD_SETSIZE
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#include <sys/param.h>
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#define FD_SETSIZE NOFILE /* maximum # select file descriptors */
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#endif
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#ifndef FD_SET
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#ifndef NFDBITS
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#define NFDBITS (8*sizeof(int)) /* number of bits per fd_mask */
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#endif
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#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
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#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
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#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
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#ifndef BSD
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#define bzero(d,n) (void)memset(d,0,n)
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#endif
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#define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
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#endif
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PSERVER *pslist = NULL; /* global process server list */
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static PROC *pindex[FD_SETSIZE]; /* process index table */
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static char ourhost[64]; /* this host name */
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static char ourdir[128]; /* our working directory */
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static char ouruser[32]; /* our user name */
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static char *ourshell; /* our user's shell */
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static fd_set errdesc; /* error file descriptors */
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static int maxfd; /* maximum assigned descriptor */
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extern char *malloc(), *realloc();
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extern char *getenv();
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PSERVER *
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addpserver(host, dir, usr, np) /* add a new process server */
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char *host, *dir, *usr;
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int np;
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{
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register PSERVER *ps;
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/* allocate the struct */
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if (np < 1)
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return(NULL);
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ps = (PSERVER *)malloc(sizeof(PSERVER)+(np-1)*sizeof(PROC));
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if (ps == NULL)
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return(NULL);
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if (!ourhost[0]) { /* initialize */
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char dirtmp[128];
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register char *cp;
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register int len;
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gethostname(ourhost, sizeof(ourhost));
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getcwd(dirtmp, sizeof(dirtmp));
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if ((cp = getenv("HOME")) != NULL) {
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if (!strcmp(cp, dirtmp))
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ourdir[0] = '\0';
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else if (!strncmp(cp, dirtmp, len=strlen(cp)) &&
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dirtmp[len] == '/')
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strcpy(ourdir, dirtmp+len+1);
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else
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strcpy(ourdir, dirtmp);
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} else
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strcpy(ourdir, dirtmp);
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if ((cp = getenv("USER")) != NULL)
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strcpy(ouruser, cp);
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if ((ourshell = getenv("SHELL")) == NULL)
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ourshell = "/bin/sh";
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FD_ZERO(&errdesc);
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maxfd = -1;
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}
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/* assign host, directory, user */
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if (host == NULL || !strcmp(host, ourhost) ||
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!strcmp(host, LHOSTNAME))
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ps->hostname[0] = '\0';
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else
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strcpy(ps->hostname, host);
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if (dir == NULL)
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strcpy(ps->directory, ourdir);
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else
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strcpy(ps->directory, dir);
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if (usr == NULL || !strcmp(usr, ouruser))
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ps->username[0] = '\0';
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else
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strcpy(ps->username, usr);
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/* clear process slots */
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ps->nprocs = np;
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while (np--) {
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ps->proc[np].com = NULL;
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ps->proc[np].pid = -1;
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ps->proc[np].efd = -1;
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ps->proc[np].errs = NULL;
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ps->proc[np].elen = 0;
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ps->proc[np].cf = NULL;
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}
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/* insert in our list */
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ps->next = pslist;
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pslist = ps;
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/* check for signs of life */
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if (!pserverOK(ps)) {
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delpserver(ps); /* failure -- abort */
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return(NULL);
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}
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return(ps);
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}
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delpserver(ps) /* delete a process server */
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PSERVER *ps;
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{
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PSERVER pstart;
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register PSERVER *psp;
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register int i;
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/* find server in our list */
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pstart.next = pslist;
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for (psp = &pstart; ps != psp->next; psp = psp->next)
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if (psp->next == NULL)
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return; /* not in our list! */
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/* kill any running jobs */
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for (i = 0; i < ps->nprocs; i++)
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if (ps->proc[i].com != NULL) {
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kill(SIGTERM, ps->proc[i].pid);
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wait4job(ps, ps->proc[i].pid);
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}
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/* remove server from list */
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psp->next = ps->next;
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pslist = pstart.next;
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free((char *)ps); /* free associated memory */
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}
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PSERVER *
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findjob(pnp) /* find out where process is running */
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register int *pnp; /* modified */
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{
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register PSERVER *ps;
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register int i;
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for (ps = pslist; ps != NULL; ps = ps->next)
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for (i = 0; i < ps->nprocs; i++)
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if (ps->proc[i].pid == *pnp) {
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*pnp = i;
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return(ps);
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}
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return(NULL); /* not found */
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}
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int
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startjob(ps, command, compf) /* start a job on a process server */
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register PSERVER *ps;
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char *command;
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int (*compf)();
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{
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char *av[12];
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int pfd[2], pid;
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register int i;
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if (ps == NULL) { /* find a server */
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for (ps = pslist; ps != NULL; ps = ps->next)
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if ((i = startjob(ps, command, compf)) != -1)
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return(i); /* got one */
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return(-1); /* no slots anywhere */
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}
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for (i = 0; i < ps->nprocs; i++)
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if (ps->proc[i].com == NULL)
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break;
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if (i >= ps->nprocs)
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return(-1); /* out of process slots */
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/* open pipe */
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if (pipe(pfd) < 0) {
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perror("cannot open pipe");
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exit(1);
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}
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/* start child process */
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if ((pid = vfork()) == 0) {
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close(pfd[0]); /* connect stderr to pipe */
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if (pfd[1] != 2) {
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dup2(pfd[1], 2);
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close(pfd[1]);
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}
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if (ps->hostname[0]) { /* rsh command */
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av[i=0] = RSH;
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av[++i] = ps->hostname;
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av[++i] = "-n"; /* no stdin */
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if (ps->username[0]) {
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av[++i] = "-l";
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av[++i] = ps->username;
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}
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if (ps->directory[0]) {
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av[++i] = "cd";
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av[++i] = ps->directory;
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av[++i] = ";";
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}
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av[++i] = command;
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av[++i] = NULL;
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} else { /* shell command */
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av[0] = ourshell;
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av[1] = "-c";
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av[2] = command;
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av[3] = NULL;
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}
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execv(av[0], av);
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_exit(1);
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}
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| 231 |
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if (pid == -1) {
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perror("fork failed");
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exit(1);
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}
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ps->proc[i].com = command; /* assign process slot */
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ps->proc[i].cf = compf;
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ps->proc[i].pid = pid;
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close(pfd[1]); /* get piped stderr file descriptor */
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ps->proc[i].efd = pfd[0];
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fcntl(pfd[0], F_SETFD, 1); /* set close on exec flag */
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pindex[pfd[0]] = ps->proc + i; /* assign error fd index */
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FD_SET(pfd[0], &errdesc); /* add to select call parameter */
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if (pfd[0] > maxfd)
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maxfd = pfd[0];
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return(pid); /* return to parent process */
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}
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| 247 |
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| 248 |
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| 249 |
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static int
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| 250 |
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readerrs(fd) /* read error output from fd */
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| 251 |
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int fd;
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| 252 |
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{
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| 253 |
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char errbuf[BUFSIZ];
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| 254 |
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int nr;
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| 255 |
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register PROC *pp;
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| 256 |
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/* look up associated process */
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if ((pp = pindex[fd]) == NULL)
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abort(); /* serious consistency error */
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nr = read(fd, errbuf, BUFSIZ-1);
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if (nr < 0) {
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perror("read error");
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| 262 |
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exit(1);
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| 263 |
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}
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| 264 |
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if (nr == 0) /* stream closed (process finished) */
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| 265 |
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return(0);
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| 266 |
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errbuf[nr] = '\0'; /* add to error buffer */
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| 267 |
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if (pp->elen == 0)
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| 268 |
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pp->errs = (char *)malloc(nr+1);
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| 269 |
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else
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| 270 |
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pp->errs = (char *)realloc(pp->errs, pp->elen+nr+1);
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| 271 |
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if (pp->errs == NULL) {
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| 272 |
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perror("malloc failed");
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| 273 |
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exit(1);
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| 274 |
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}
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| 275 |
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strcpy(pp->errs+pp->elen, errbuf);
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| 276 |
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pp->elen += nr;
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| 277 |
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return(nr);
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| 278 |
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}
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| 279 |
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| 280 |
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| 281 |
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static
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| 282 |
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wait4end() /* read error streams until someone is done */
|
| 283 |
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{
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| 284 |
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fd_set readfds, excepfds;
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| 285 |
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register int i;
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| 286 |
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/* find end of descriptor set */
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| 287 |
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for ( ; maxfd >= 0; maxfd--)
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| 288 |
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if (FD_ISSET(maxfd, &errdesc))
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| 289 |
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break;
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| 290 |
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if (maxfd < 0)
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| 291 |
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return; /* nothing to read */
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| 292 |
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readfds = excepfds = errdesc;
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| 293 |
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while (select(maxfd+1, &readfds, NULL, &excepfds, NULL) > 0)
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| 294 |
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for (i = 0; i <= maxfd; i++) /* get pending i/o */
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| 295 |
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if (FD_ISSET(i, &readfds) || FD_ISSET(i, &excepfds))
|
| 296 |
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if (readerrs(i) == 0)
|
| 297 |
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return; /* finished process */
|
| 298 |
|
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perror("select call failed");
|
| 299 |
|
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exit(1);
|
| 300 |
|
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}
|
| 301 |
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|
| 302 |
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|
| 303 |
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static int
|
| 304 |
|
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finishjob(ps, pn, status) /* clean up finished process */
|
| 305 |
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PSERVER *ps;
|
| 306 |
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int pn;
|
| 307 |
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int status;
|
| 308 |
|
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{
|
| 309 |
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register PROC *pp;
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| 310 |
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|
| 311 |
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pp = ps->proc + pn;
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| 312 |
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if (pp->cf != NULL) /* client cleanup */
|
| 313 |
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status = (*pp->cf)(ps, pn, status);
|
| 314 |
|
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close(pp->efd); /* close error stream */
|
| 315 |
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pindex[pp->efd] = NULL;
|
| 316 |
|
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FD_CLR(pp->efd, &errdesc);
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| 317 |
|
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free((char *)pp->errs);
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| 318 |
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pp->com = NULL; /* clear settings */
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| 319 |
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pp->pid = -1;
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| 320 |
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pp->efd = -1;
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| 321 |
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pp->errs = NULL;
|
| 322 |
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pp->elen = 0;
|
| 323 |
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pp->cf = NULL;
|
| 324 |
|
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return(status);
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| 325 |
|
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}
|
| 326 |
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|
| 327 |
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|
| 328 |
|
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int
|
| 329 |
|
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wait4job(ps, pid) /* wait for process to finish */
|
| 330 |
|
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PSERVER *ps;
|
| 331 |
|
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int pid;
|
| 332 |
|
|
{
|
| 333 |
|
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int status, psn, psn2;
|
| 334 |
|
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PSERVER *ps2;
|
| 335 |
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|
| 336 |
|
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if (pid == -1) { /* wait for first job */
|
| 337 |
|
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if (ps != NULL) {
|
| 338 |
|
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for (psn = ps->nprocs; psn--; )
|
| 339 |
|
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if (ps->proc[psn].com != NULL)
|
| 340 |
|
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break;
|
| 341 |
|
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if (psn < 0)
|
| 342 |
|
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return(-1); /* no processes this server */
|
| 343 |
|
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}
|
| 344 |
|
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do {
|
| 345 |
|
|
wait4end(); /* wait for something to end */
|
| 346 |
|
|
if ((psn2 = wait(&status)) == -1)
|
| 347 |
|
|
return(-1); /* none left */
|
| 348 |
|
|
ps2 = findjob(&psn2);
|
| 349 |
|
|
if (ps2 != NULL) /* clean up job if ours */
|
| 350 |
|
|
status = finishjob(ps2, psn2, status);
|
| 351 |
|
|
} while (ps2 == NULL || (ps != NULL && ps2 != ps));
|
| 352 |
|
|
return(status); /* return job status */
|
| 353 |
|
|
}
|
| 354 |
|
|
psn = pid; /* else find specific job */
|
| 355 |
|
|
ps2 = findjob(&psn); /* find process slot */
|
| 356 |
|
|
if (ps2 == NULL || (ps != NULL && ps2 != ps))
|
| 357 |
|
|
return(-1); /* inconsistent target */
|
| 358 |
|
|
ps = ps2;
|
| 359 |
|
|
do {
|
| 360 |
|
|
wait4end(); /* wait for something to end */
|
| 361 |
|
|
if ((psn2 = wait(&status)) == -1)
|
| 362 |
|
|
return(-1); /* none left */
|
| 363 |
|
|
ps2 = findjob(&psn2);
|
| 364 |
|
|
if (ps2 != NULL) /* clean up job if ours */
|
| 365 |
|
|
status = finishjob(ps2, psn2, status);
|
| 366 |
|
|
} while (ps2 != ps || psn2 != psn);
|
| 367 |
|
|
return(status); /* return job status */
|
| 368 |
|
|
}
|
