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

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 2153 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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 /*
    10 * Print the name of a block device.
    11 */
    12 #define BUF_SIZE 512
    13
    14 static int scansysdir(char *namebuf, char *sysdir, dev_t dev)
    15 {
    16 char *dirtailptr = strchr(sysdir, '\0');
    17 DIR *dir;
    18 int done = 0;
    19 struct dirent *de;
    20 char *systail;
    21 FILE *sysdev;
    22 unsigned long ma, mi;
    23 char *ep;
    24 ssize_t rd;
    25
    26 if (!(dir = opendir(sysdir)))
    27 return 0;
    28
    29 *dirtailptr++ = '/';
    30
    31 while (!done && (de = readdir(dir))) {
    32 /* Assume if we see a dot-name in sysfs it's special */
    33 if (de->d_name[0] == '.')
    34 continue;
    35
    36 if (de->d_type != DT_UNKNOWN && de->d_type != DT_DIR)
    37 continue;
    38
    39 if (strlen(de->d_name) >=
    40 (BUF_SIZE - 64) - (dirtailptr - sysdir))
    41 continue; /* Badness... */
    42
    43 strcpy(dirtailptr, de->d_name);
    44 systail = strchr(sysdir, '\0');
    45
    46 strcpy(systail, "/dev");
    47 if (!(sysdev = fopen(sysdir, "r")))
    48 continue;
    49
    50 /* Abusing the namebuf as temporary storage here. */
    51 rd = fread(namebuf, 1, BUF_SIZE, sysdev);
    52 namebuf[rd] = '\0'; /* Just in case... */
    53
    54 fclose(sysdev);
    55
    56 ma = strtoul(namebuf, &ep, 10);
    57 if (ma != major(dev) || *ep != ':')
    58 continue;
    59
    60 mi = strtoul(ep + 1, &ep, 10);
    61 if (*ep != '\n')
    62 continue;
    63
    64 if (mi == minor(dev)) {
    65 /* Found it! */
    66 strcpy(namebuf, de->d_name);
    67 done = 1;
    68 } else {
    69 /* we have a major number match, scan for partitions */
    70 *systail = '\0';
    71 done = scansysdir(namebuf, sysdir, dev);
    72 }
    73 }
    74
    75 closedir(dir);
    76 return done;
    77 }
    78
    79 const char *bdevname(dev_t dev)
    80 {
    81 static char buf[BUF_SIZE];
    82 char sysdir[BUF_SIZE];
    83 char *p;
    84
    85 strcpy(sysdir, "/sys/block");
    86
    87 if (!scansysdir(buf, sysdir, dev))
    88 strcpy(buf, "dev"); /* prints e.g. dev(3,5) */
    89
    90 p = strchr(buf, '\0');
    91 snprintf(p, sizeof buf - (p - buf), "(%d,%d)", major(dev), minor(dev));
    92
    93 return buf;
    94 }
    95
    96 #ifdef TEST_DEVNAME /* Standalone test */
    97
    98 int main(int argc, char *argv[])
    99 {
    100 dev_t dev;
    101 int i;
    102
    103 for (i = 1; i < argc; i++) {
    104 dev = strtoul(argv[i], NULL, 0);
    105
    106 printf("0x%08x = %s\n", (unsigned int)dev, bdevname(dev));
    107 }
    108
    109 return 0;
    110 }
    111
    112 #endif /* TEST */