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Annotation of researchv10no/ipc/mgrs/4.3gate/ipcopen.c, revision 1.1.1.1

1.1       root        1: #include <sys/types.h>
                      2: #include <sys/ioctl.h>
                      3: #include <sys/stat.h>
                      4: #include <ipc.h>
                      5: #include "defs.h"
                      6: 
                      7: /* exported */
                      8: char *errstr;
                      9: cahr *ipcname;
                     10: 
                     11: /* imports */
                     12: extern int atoi();
                     13: extern char *memchr();
                     14: 
                     15: /* local only */
                     16: static int net[128];
                     17: 
                     18: extern int tcpdial(), tcpaccept(), tcpreject();
                     19: ipcinfo *tcplisten();
                     20: 
                     21: static struct network{
                     22:        char *name;
                     23:        int (*dial)();
                     24:        ipcinfo *(*listen)();
                     25:        int (*accept)();
                     26:        int (*reject)();
                     27: } nets[] = {
                     28: #define TCP 0
                     29:        { "/cs/tcp", tcpdial, tcplisten, tcpaccept, tcpreject },
                     30:        { 0, 0, 0, 0, 0 }
                     31: };
                     32: 
                     33: /*
                     34:  *  announce or connect to a detination
                     35:  */
                     36: int
                     37: ipcdial(ip)
                     38:        ipcinfo *ip;
                     39: {
                     40:        int fd;
                     41:        char name[128]; 
                     42:        char *field[3];
                     43:        struct network *np;
                     44:        static char nipcname[128];
                     45: 
                     46:        /* parse the name */
                     47:        strcpy(name, ip->name);
                     48:        setfields("!");
                     49:        getfields(name, field, 3);
                     50: 
                     51:        /* action depends on network */
                     52:        for(np=nets; np->name; np++)
                     53:                if (strcmp(field[0], np->name)==0)
                     54:                        break;
                     55:        if (np->name) {
                     56:                ip->net = net[fd] = np-nets;
                     57:                fd = (*np->dial)(ip, field[1], field[2]);
                     58:                sprintf(nipcname, "%s!%s", nets[ip->net].name, ipcname);
                     59:                ipcname = nipcname;
                     60:        }
                     61: 
                     62:        /* unknown network/service */
                     63:        return _ipcabort("not implemented", EIO, ip);
                     64: }
                     65: 
                     66: /*
                     67:  *  plug into a name space
                     68:  */
                     69: int
                     70: ipccreat(name, param)
                     71:        char *name;     /* name being dialed */
                     72:        char *param;    /* parameters for creation */
                     73: {
                     74:        int pfd[2];
                     75:        char *path=name;
                     76:        ipcinfo info;
                     77: 
                     78:        /* remote creat */
                     79:        info.rfd = info.cfd = -1;
                     80:        info.myname = info.user = info.machine = NULL;
                     81:        info.uid = info.gid = -1;
                     82:        info.name = name;
                     83:        info.param = param;
                     84:        info.flags = IPC_CREAT;
                     85:        return ipcdial(&info);
                     86: }
                     87: 
                     88: /*
                     89:  *  call up an announced service
                     90:  */
                     91: int
                     92: ipcopen(name, param)
                     93:        char *name;     /* name being dialed */
                     94:        char *param;    /* parameters for dialer */
                     95: {
                     96:        ipcinfo info;
                     97: 
                     98:        info.rfd = info.cfd = -1;
                     99:        info.myname = info.user = info.machine = NULL;
                    100:        info.uid = info.gid = -1;
                    101:        info.name = name;
                    102:        info.param = param;
                    103:        info.flags = IPC_OPEN;
                    104:        return ipcdial(&info);
                    105: }
                    106: 
                    107: /*
                    108:  *  set error number and string and return -1
                    109:  */
                    110: int
                    111: _ipcabort(no, err, ip)
                    112:        int no;
                    113:        char *err;
                    114:        ipcinfo *ip;
                    115: {
                    116:        errstr = err;
                    117:        errno = no;
                    118:        return -1;
                    119: } 
                    120: 
                    121: /* 
                    122:  *  listen for a connection
                    123:  */
                    124: ipcinfo *
                    125: ipclisten(fd)
                    126:        int fd;
                    127: {
                    128:        static ipcinfo info;
                    129:        static char myname[128];
                    130:        static char machine[128];
                    131:        static char nipcname[128];
                    132:        ipcinfo *ip;
                    133: 
                    134:        info.rfd = info.cfd = -1;
                    135:        info.myname = info.machine = "";
                    136:        info.user = "unknown";
                    137:        info.uid = info.gid = -1;
                    138:        info.name = name;
                    139:        info.param = param;
                    140:        info.flags = IPC_CREAT;
                    141:        ip = (*nets[net[fd]].listen)(fd, &info);
                    142:        if(ip == NULL)
                    143:                return(ip);
                    144:        ip->net = net[fd];
                    145:        sprintf(myname, "%s!%s", nets[ip->net].name, ip->myname);
                    146:        ip->myname = myname;
                    147:        sprintf(machine, "%s!%s", nets[ip->net].name, ip->machine);
                    148:        ip->machine = machine;
                    149:        sprintf(nipcname, "%s!%s", nets[ip->net].name, ipcname);
                    150:        ipcname = nipcname;
                    151:        return(ip);
                    152: }
                    153: 
                    154: /*
                    155:  *  Accept a connection.  Close all except ip->cfd.
                    156:  */
                    157: int
                    158: ipcaccept(ip)
                    159:        ipcinfo *ip;
                    160: {
                    161:        return (*nets[ip->net].accept)(ip);
                    162: }
                    163: 
                    164: /*
                    165:  *   Reject a connection.
                    166:  */
                    167: int
                    168: ipcreject(ip, no, str)
                    169:        ipcinfo *ip;
                    170:        int no;         /* error number */
                    171:        char *str;      /* error string */
                    172: {
                    173:        return (*nets[ip->net].reject)(ip, no, str);
                    174:        _ipcabort(no, str, ip);
                    175:        return 0;
                    176: }

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