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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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greg |
2.2 |
strcpy(ourhost, myhostname()); |
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greg |
2.1 |
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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} |
| 228 |
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execv(av[0], av); |
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_exit(1); |
| 230 |
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} |
| 231 |
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if (pid == -1) { |
| 232 |
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perror("fork failed"); |
| 233 |
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exit(1); |
| 234 |
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} |
| 235 |
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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; |
| 238 |
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close(pfd[1]); /* get piped stderr file descriptor */ |
| 239 |
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ps->proc[i].efd = pfd[0]; |
| 240 |
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fcntl(pfd[0], F_SETFD, 1); /* set close on exec flag */ |
| 241 |
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pindex[pfd[0]] = ps->proc + i; /* assign error fd index */ |
| 242 |
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FD_SET(pfd[0], &errdesc); /* add to select call parameter */ |
| 243 |
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if (pfd[0] > maxfd) |
| 244 |
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maxfd = pfd[0]; |
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return(pid); /* return to parent process */ |
| 246 |
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} |
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static int |
| 250 |
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readerrs(fd) /* read error output from fd */ |
| 251 |
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int fd; |
| 252 |
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{ |
| 253 |
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char errbuf[BUFSIZ]; |
| 254 |
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int nr; |
| 255 |
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register PROC *pp; |
| 256 |
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/* look up associated process */ |
| 257 |
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if ((pp = pindex[fd]) == NULL) |
| 258 |
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abort(); /* serious consistency error */ |
| 259 |
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nr = read(fd, errbuf, BUFSIZ-1); |
| 260 |
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if (nr < 0) { |
| 261 |
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perror("read error"); |
| 262 |
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exit(1); |
| 263 |
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} |
| 264 |
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if (nr == 0) /* stream closed (process finished) */ |
| 265 |
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return(0); |
| 266 |
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errbuf[nr] = '\0'; /* add to error buffer */ |
| 267 |
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if (pp->elen == 0) |
| 268 |
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pp->errs = (char *)malloc(nr+1); |
| 269 |
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else |
| 270 |
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pp->errs = (char *)realloc(pp->errs, pp->elen+nr+1); |
| 271 |
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if (pp->errs == NULL) { |
| 272 |
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perror("malloc failed"); |
| 273 |
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exit(1); |
| 274 |
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} |
| 275 |
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strcpy(pp->errs+pp->elen, errbuf); |
| 276 |
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pp->elen += nr; |
| 277 |
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return(nr); |
| 278 |
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} |
| 279 |
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| 281 |
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static |
| 282 |
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wait4end() /* read error streams until someone is done */ |
| 283 |
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{ |
| 284 |
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fd_set readfds, excepfds; |
| 285 |
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register int i; |
| 286 |
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/* find end of descriptor set */ |
| 287 |
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for ( ; maxfd >= 0; maxfd--) |
| 288 |
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if (FD_ISSET(maxfd, &errdesc)) |
| 289 |
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break; |
| 290 |
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if (maxfd < 0) |
| 291 |
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return; /* nothing to read */ |
| 292 |
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readfds = excepfds = errdesc; |
| 293 |
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while (select(maxfd+1, &readfds, NULL, &excepfds, NULL) > 0) |
| 294 |
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for (i = 0; i <= maxfd; i++) /* get pending i/o */ |
| 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; |
| 310 |
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| 311 |
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pp = ps->proc + pn; |
| 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); |
| 317 |
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free((char *)pp->errs); |
| 318 |
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pp->com = NULL; /* clear settings */ |
| 319 |
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pp->pid = -1; |
| 320 |
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pp->efd = -1; |
| 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); |
| 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 |
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{ |
| 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 |
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wait4end(); /* wait for something to end */ |
| 346 |
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if ((psn2 = wait(&status)) == -1) |
| 347 |
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return(-1); /* none left */ |
| 348 |
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ps2 = findjob(&psn2); |
| 349 |
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if (ps2 != NULL) /* clean up job if ours */ |
| 350 |
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status = finishjob(ps2, psn2, status); |
| 351 |
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} while (ps2 == NULL || (ps != NULL && ps2 != ps)); |
| 352 |
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return(status); /* return job status */ |
| 353 |
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} |
| 354 |
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psn = pid; /* else find specific job */ |
| 355 |
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ps2 = findjob(&psn); /* find process slot */ |
| 356 |
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if (ps2 == NULL || (ps != NULL && ps2 != ps)) |
| 357 |
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return(-1); /* inconsistent target */ |
| 358 |
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ps = ps2; |
| 359 |
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do { |
| 360 |
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wait4end(); /* wait for something to end */ |
| 361 |
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if ((psn2 = wait(&status)) == -1) |
| 362 |
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return(-1); /* none left */ |
| 363 |
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ps2 = findjob(&psn2); |
| 364 |
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if (ps2 != NULL) /* clean up job if ours */ |
| 365 |
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status = finishjob(ps2, psn2, status); |
| 366 |
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} while (ps2 != ps || psn2 != psn); |
| 367 |
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return(status); /* return job status */ |
| 368 |
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} |
