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    Contents of /trunk/mkinitrd-magellan/klibc/usr/kinit/devname.c

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    Revision 815 - (show annotations) (download)
    Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
    File MIME type: text/plain
    File size: 2173 byte(s) 
    -updated to klibc-1.5.15
    1 #include <stdio.h>
    2 #include <stdlib.h>
    3 #include <unistd.h>
    4 #include <dirent.h>
    5 #include <string.h>
    6 #include <sys/types.h>
    7 #include <sys/sysmacros.h>
    8
    9 #include "kinit.h"
    10
    11 /*
    12 * Print the name of a block device.
    13 */
    14 #define BUF_SIZE 512
    15
    16 static int scansysdir(char *namebuf, char *sysdir, dev_t dev)
    17 {
    18 char *dirtailptr = strchr(sysdir, '\0');
    19 DIR *dir;
    20 int done = 0;
    21 struct dirent *de;
    22 char *systail;
    23 FILE *sysdev;
    24 unsigned long ma, mi;
    25 char *ep;
    26 ssize_t rd;
    27
    28 if (!(dir = opendir(sysdir)))
    29 return 0;
    30
    31 *dirtailptr++ = '/';
    32
    33 while (!done && (de = readdir(dir))) {
    34 /* Assume if we see a dot-name in sysfs it's special */
    35 if (de->d_name[0] == '.')
    36 continue;
    37
    38 if (de->d_type != DT_UNKNOWN && de->d_type != DT_DIR)
    39 continue;
    40
    41 if (strlen(de->d_name) >=
    42 (BUF_SIZE - 64) - (dirtailptr - sysdir))
    43 continue; /* Badness... */
    44
    45 strcpy(dirtailptr, de->d_name);
    46 systail = strchr(sysdir, '\0');
    47
    48 strcpy(systail, "/dev");
    49 if (!(sysdev = fopen(sysdir, "r")))
    50 continue;
    51
    52 /* Abusing the namebuf as temporary storage here. */
    53 rd = fread(namebuf, 1, BUF_SIZE, sysdev);
    54 namebuf[rd] = '\0'; /* Just in case... */
    55
    56 fclose(sysdev);
    57
    58 ma = strtoul(namebuf, &ep, 10);
    59 if (ma != major(dev) || *ep != ':')
    60 continue;
    61
    62 mi = strtoul(ep + 1, &ep, 10);
    63 if (*ep != '\n')
    64 continue;
    65
    66 if (mi == minor(dev)) {
    67 /* Found it! */
    68 strcpy(namebuf, de->d_name);
    69 done = 1;
    70 } else {
    71 /* we have a major number match, scan for partitions */
    72 *systail = '\0';
    73 done = scansysdir(namebuf, sysdir, dev);
    74 }
    75 }
    76
    77 closedir(dir);
    78 return done;
    79 }
    80
    81 const char *bdevname(dev_t dev)
    82 {
    83 static char buf[BUF_SIZE];
    84 char sysdir[BUF_SIZE];
    85 char *p;
    86
    87 strcpy(sysdir, "/sys/block");
    88
    89 if (!scansysdir(buf, sysdir, dev))
    90 strcpy(buf, "dev"); /* prints e.g. dev(3,5) */
    91
    92 p = strchr(buf, '\0');
    93 snprintf(p, sizeof buf - (p - buf), "(%d,%d)", major(dev), minor(dev));
    94
    95 return buf;
    96 }
    97
    98 #ifdef TEST_DEVNAME /* Standalone test */
    99
    100 int main(int argc, char *argv[])
    101 {
    102 dev_t dev;
    103 int i;
    104
    105 for (i = 1; i < argc; i++) {
    106 dev = strtoul(argv[i], NULL, 0);
    107
    108 printf("0x%08x = %s\n", (unsigned int)dev, bdevname(dev));
    109 }
    110
    111 return 0;
    112 }
    113
    114 #endif /* TEST */