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Annotation of 43BSDReno/bin/ps/devname.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)devname.c  5.5 (Berkeley) 5/31/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/types.h>
        !            25: #include <sys/stat.h>
        !            26: #include <sys/file.h>
        !            27: #include <dirent.h>
        !            28: #include <paths.h>
        !            29: 
        !            30: static struct devs {
        !            31:        struct  devs *next;
        !            32:        dev_t   dev;
        !            33:        char    name[MAXNAMLEN+1];
        !            34:        mode_t  type;
        !            35: };
        !            36: 
        !            37: #define        hash(x) ((x)&0xff)
        !            38: static struct devs *devhash[0xff];
        !            39: 
        !            40: static int devinit;
        !            41: 
        !            42: char *
        !            43: devname(dev, type)
        !            44:        dev_t dev;
        !            45:        mode_t type;
        !            46: {
        !            47:        struct devs *devp;
        !            48: 
        !            49:        if (devinit == 0) {
        !            50:                register struct devs *devpp;
        !            51:                register struct dirent *entry;
        !            52:                struct stat sb;
        !            53:                DIR *dp = opendir(_PATH_DEV);
        !            54:                int savewd = open(".", O_RDONLY, 0);
        !            55:                mode_t specialtype;
        !            56: 
        !            57:                if (savewd == -1 || dp == NULL || chdir(_PATH_DEV) == -1)
        !            58:                        return (NULL);
        !            59:                while ((entry = readdir(dp)) != NULL) {
        !            60:                        if (stat(entry->d_name, &sb) == -1)
        !            61:                                continue;
        !            62:                        switch(sb.st_mode&S_IFMT) {
        !            63:                        case S_IFCHR:
        !            64:                                specialtype = S_IFCHR;
        !            65:                                break;
        !            66:                        case S_IFBLK:
        !            67:                                specialtype = S_IFBLK;
        !            68:                                break;
        !            69:                        default:
        !            70:                                continue;
        !            71:                        }
        !            72:                        devp = (struct devs *)malloc(sizeof (struct devs));
        !            73:                        if (devp == NULL)
        !            74:                                return (NULL);
        !            75:                        devp->type = specialtype;
        !            76:                        devp->dev = sb.st_rdev;
        !            77:                        strcpy(devp->name, entry->d_name);
        !            78:                        devp->next = NULL;
        !            79:                        if ((devpp = devhash[hash(sb.st_rdev)]) == NULL)
        !            80:                                devhash[hash(sb.st_rdev)] = devp;
        !            81:                        else {
        !            82:                                for (;devpp->next != NULL; devpp = devpp->next)
        !            83:                                        ;
        !            84:                                devpp->next = devp;
        !            85:                        }
        !            86:                }
        !            87:                fchdir(savewd);
        !            88:                close(savewd);
        !            89:                closedir(dp);
        !            90:                devinit = 1;
        !            91:        }
        !            92:        for (devp = devhash[hash(dev)]; devp != NULL; devp = devp->next)
        !            93:                if (dev == devp->dev && type == devp->type)
        !            94:                        return(devp->name);
        !            95: 
        !            96:        return (NULL);
        !            97: }
        !            98: 
        !            99: #ifdef TEST
        !           100: main() {
        !           101:        printf(" %s \n", devname(0));
        !           102: }
        !           103: #endif

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