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[/] [or1k/] [trunk/] [linux/] [uClibc/] [utils/] [ldconfig.c] - Blame information for rev 1771

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/*
 * ldconfig - update shared library symlinks
 *
 * usage: ldconfig [-DvqnNX] [-f conf] [-C cache] [-r root] dir ...
 *        ldconfig -l [-Dv] lib ...
 *        ldconfig -p
 *        -D: debug mode, don't update links
 *        -v: verbose mode, print things as we go
 *        -q: quiet mode, don't print warnings
 *        -n: don't process standard directories
 *        -N: don't update the library cache
 *        -X: don't update the library links
 *        -l: library mode, manually link libraries
 *        -p: print the current library cache
 *        -f conf: use conf instead of /etc/ld.so.conf
 *        -C cache: use cache instead of /etc/ld.so.cache
 *        -r root: first, do a chroot to the indicated directory
 *        dir ...: directories to process
 *        lib ...: libraries to link
 *
 * Copyright 1994-2000 David Engel and Mitch D'Souza
 *
 * This program may be used for any purpose as long as this
 * copyright notice is kept.
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <getopt.h>
#include <dirent.h>
#include <unistd.h>
#include <link.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <ld_elf.h>
#include "readsoname.h"
 
struct exec
{
  unsigned long a_info;         /* Use macros N_MAGIC, etc for access */
  unsigned a_text;              /* length of text, in bytes */
  unsigned a_data;              /* length of data, in bytes */
  unsigned a_bss;               /* length of uninitialized data area for file, in bytes */
  unsigned a_syms;              /* length of symbol table data in file, in bytes */
  unsigned a_entry;             /* start address */
  unsigned a_trsize;            /* length of relocation info for text, in bytes */
  unsigned a_drsize;            /* length of relocation info for data, in bytes */
};
 
#if !defined (N_MAGIC)
#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#endif
/* Code indicating object file or impure executable.  */
#define OMAGIC 0407
/* Code indicating pure executable.  */
#define NMAGIC 0410
/* Code indicating demand-paged executable.  */
#define ZMAGIC 0413
/* This indicates a demand-paged executable with the header in the text.
   The first page is unmapped to help trap NULL pointer references */
#define QMAGIC 0314
/* Code indicating core file.  */
#define CMAGIC 0421
 
char *___strtok = NULL;
 
/* For SunOS */
#ifndef PATH_MAX
#include <limits.h>
#define PATH_MAX _POSIX_PATH_MAX
#endif
 
/* For SunOS */
#ifndef N_MAGIC
#define N_MAGIC(exec) ((exec).a_magic & 0xffff)
#endif
 
#define EXIT_OK    0
#define EXIT_FATAL 128
 
char *prog = NULL;
int debug = 0;                   /* debug mode */
int verbose = 0;         /* verbose mode */
int libmode = 0;         /* library mode */
int nocache = 0;         /* don't build cache */
int nolinks = 0;         /* don't update links */
 
char *conffile = LDSO_CONF;     /* default conf file */
char *cachefile = LDSO_CACHE;   /* default cache file */
void cache_print(void);
void cache_dolib(const char *dir, const char *so, int libtype);
void cache_write(void);
 
/* These two are used internally -- you shouldn't need to use them */
static void verror_msg(const char *s, va_list p)
{
        fflush(stdout);
        fprintf(stderr, "%s: ", prog);
        vfprintf(stderr, s, p);
}
 
extern void warnx(const char *s, ...)
{
        va_list p;
 
        va_start(p, s);
        verror_msg(s, p);
        va_end(p);
        fprintf(stderr, "\n");
}
 
extern void err(int errnum, const char *s, ...)
{
        va_list p;
 
        va_start(p, s);
        verror_msg(s, p);
        va_end(p);
        fprintf(stderr, "\n");
        exit(errnum);
}
 
static void vperror_msg(const char *s, va_list p)
{
        int err = errno;
 
        if (s == 0)
                s = "";
        verror_msg(s, p);
        if (*s)
                s = ": ";
        fprintf(stderr, "%s%s\n", s, strerror(err));
}
 
extern void warn(const char *s, ...)
{
        va_list p;
 
        va_start(p, s);
        vperror_msg(s, p);
        va_end(p);
}
 
void *xmalloc(size_t size)
{
    void *ptr;
    if ((ptr = malloc(size)) == NULL)
        err(EXIT_FATAL,"out of memory");
    return ptr;
}
 
char *xstrdup(const char *str)
{
    char *ptr;
    if ((ptr = strdup(str)) == NULL)
        err(EXIT_FATAL,"out of memory");
    return ptr;
}
 
/* If shared library, return a malloced copy of the soname and set the
   type, else return NULL.
 
   expected_type should be either LIB_ANY or one of the following:-
   LIB_DLL
   LIB_ELF
   LIB_ELF_LIBC5
   LIB_ELF_LIBC6
 
   If the lib is ELF and we can not deduce the type the type will
   be set based on expected_type.
 
   If the expected, actual/deduced types missmatch we display a warning
   and use the actual/deduced type.
*/
char *is_shlib(const char *dir, const char *name, int *type,
        int *islink, int expected_type)
{
    char *good = NULL;
    char *cp, *cp2;
    FILE *file;
    struct exec exec;
    ElfW(Ehdr) *elf_hdr;
    struct stat statbuf;
    char buff[4096];
 
    /* see if name is of the form *.so* */
    if (name[strlen(name)-1] != '~' && (cp = strstr(name, ".so")))
    {
        /* find the start of the Vminor part, if any */
        if (cp[3] == '.' && (cp2 = strchr(cp + 4, '.')))
            cp = cp2;
        else
            cp = cp + strlen(cp);
 
        /* construct the full path name */
        sprintf(buff, "%s%s%s", dir, (*dir && strcmp(dir, "/")) ?
                "/" : "", name);
 
        /* first, make sure it's a regular file */
        if (lstat(buff, &statbuf))
            warn("skipping %s", buff);
        else if (!S_ISREG(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode))
            warnx("%s is not a regular file or symlink, skipping", buff);
        else
        {
            /* is it a regular file or a symlink */
            *islink = S_ISLNK(statbuf.st_mode);
 
            /* then try opening it */
            if (!(file = fopen(buff, "rb")))
                warn("skipping %s", buff);
            else
            {
                /* now make sure it's a shared library */
                if (fread(&exec, sizeof exec, 1, file) < 1)
                    warnx("can't read header from %s, skipping", buff);
                else if (N_MAGIC(exec) != ZMAGIC && N_MAGIC(exec) != QMAGIC)
                {
                    elf_hdr = (ElfW(Ehdr) *) &exec;
                    if (elf_hdr->e_ident[0] != 0x7f ||
                            strncmp(&elf_hdr->e_ident[1], "ELF",3) != 0)
                    {
                        /* silently ignore linker scripts */
                        if (strncmp((char *)&exec, "/* GNU ld", 9) != 0)
                            warnx("%s is not a shared library, skipping", buff);
                    }
                    else
                    {
                        /* always call readsoname to update type */
                        if(expected_type == LIB_DLL) {
                            warnx("%s is not an a.out library, its ELF!\n", buff);
                            expected_type=LIB_ANY;
                        }
                        *type = LIB_ELF;
                        good = readsoname(buff, file, expected_type, type,
                                elf_hdr->e_ident[EI_CLASS]);
                        if (good == NULL || *islink)
                        {
                            if (good != NULL)
                                free(good);
                            good = xstrdup(name);
                        }
                        else
                        {
                            /* if the soname does not match the filename,
                               issue a warning, but only in debug mode. */
                            int len = strlen(good);
                            if (debug && (strncmp(good, name, len) != 0 ||
                                        (name[len] != '\0' && name[len] != '.')))
                                warnx("%s has inconsistent soname (%s)", buff, good);
                        }
                    }
                }
                else
                {
                    if (*islink)
                        good = xstrdup(name);
                    else
                    {
                        good = xmalloc(cp - name + 1);
                        strncpy(good, name, cp - name);
                        good[cp - name] = '\0';
                    }
                    if(expected_type != LIB_ANY && expected_type != LIB_DLL)
                    {
                        warnx("%s is not an ELF library, its an a.out DLL!", buff);
                        expected_type=LIB_ANY;
                    }
 
                    *type = LIB_DLL;
                }
                fclose(file);
            }
        }
    }
 
    return good;
}
 
/* update the symlink to new library */
void link_shlib(const char *dir, const char *file, const char *so)
{
    int change = 1;
    char libname[4096];
    char linkname[4096];
    struct stat libstat;
    struct stat linkstat;
 
    /* construct the full path names */
    sprintf(libname, "%s/%s", dir, file);
    sprintf(linkname, "%s/%s", dir, so);
 
    /* see if a link already exists */
    if (!stat(linkname, &linkstat))
    {
        /* now see if it's the one we want */
        if (stat(libname, &libstat))
            warn("can't stat %s", libname);
        else if (libstat.st_dev == linkstat.st_dev &&
                libstat.st_ino == linkstat.st_ino)
            change = 0;
    }
 
    /* then update the link, if required */
    if (change > 0 && !nolinks)
    {
        if (!lstat(linkname, &linkstat))
        {
            if (!S_ISLNK(linkstat.st_mode))
            {
                warnx("%s is not a symlink", linkname);
                change = -1;
            }
            else if (remove(linkname))
            {
                warn("can't unlink %s", linkname);
                change = -1;
            }
        }
        if (change > 0)
        {
            if (symlink(file, linkname))
            {
                warn("can't link %s to %s", linkname, file);
                change = -1;
            }
        }
    }
 
    /* some people like to know what we're doing */
    if (verbose > 0)
        printf("\t%s => %s%s\n", so, file,
                change < 0 ? " (SKIPPED)" :
                (change > 0 ? " (changed)" : ""));
 
    return;
}
 
/* figure out which library is greater */
int libcmp(char *p1, char *p2)
{
    while (*p1)
    {
        if (isdigit(*p1) && isdigit(*p2))
        {
            /* must compare this numerically */
            int v1, v2;
            v1 = strtoul(p1, &p1, 10);
            v2 = strtoul(p2, &p2, 10);
            if (v1 != v2)
                return v1 - v2;
        }
        else if (isdigit(*p1) && !isdigit(*p2))
            return 1;
        else if (!isdigit(*p1) && isdigit(*p2))
            return -1;
        else if (*p1 != *p2)
            return *p1 - *p2;
        else
            p1++, p2++;
    }
 
    return *p1 - *p2;
}
 
struct lib
{
    char *so;                   /* soname of a library */
    char *name;                 /* name of a library */
    int libtype;                /* type of a library */
    int islink;                 /* is it a symlink */
    struct lib *next;           /* next library in list */
};
 
/* update all shared library links in a directory */
void scan_dir(const char *rawname)
{
    DIR *dir;
    const char *name;
    struct dirent *ent;
    char *so, *path, *path_n;
    struct lib *lp, *libs = NULL;
    int i, libtype, islink, expected_type = LIB_ANY;
 
    /* We need a writable copy of this string */
    path = strdup(rawname);
    if (!path) {
        err(EXIT_FATAL, "Out of memory!\n");
    }
    /* Eliminate all double //s */
    path_n=path;
    while((path_n=strstr(path_n, "//"))) {
        i = strlen(path_n);
        memmove(path_n, path_n+1, i-1);
        *(path_n + i - 1)='\0';
    }
    name = path;
 
#if 0
    char *t;
    /* Check for an embedded expected type */
    t=strrchr(name, '=');
    if( t )
    {
        *t++ = '\0'; /* Skip = char */
        if(strcasecmp(t, "libc4") == 0)
        {
            expected_type = LIB_DLL;
        }
        else
        {
            if(strcasecmp(t, "libc5") == 0)
            {
                expected_type = LIB_ELF_LIBC5;
            }
            else
            {
                if(strcasecmp(t, "libc6") == 0)
                {
                    expected_type = LIB_ELF_LIBC6;
                }
                else
                {
                    if(strcasecmp(t, "libc0") == 0)
                    {
                        expected_type = LIB_ELF_LIBC0;
                    }
                    else
                    {
                        warnx("Unknown type field '%s' for dir '%s' - ignored\n", t, name);
                        expected_type = LIB_ANY;
                    }
                }
            }
        }
    }
#endif
 
    /* let 'em know what's going on */
    if (verbose > 0)
        printf("%s:\n", name);
 
    /* if we can't open it, we can't do anything */
    if ((dir = opendir(name)) == NULL)
    {
        warn("skipping %s", name);
        free(path);
        return;
    }
 
    /* yes, we have to look at every single file */
    while ((ent = readdir(dir)) != NULL)
    {
        /* if it's not a shared library, don't bother */
        if ((so = is_shlib(name, ent->d_name, &libtype, &islink, expected_type)) == NULL)
            continue;
 
        /* have we already seen one with the same so name? */
        for (lp = libs; lp; lp = lp->next)
        {
            if (strcmp(so, lp->so) == 0)
            {
                /* we have, which one do we want to use? */
                if ((!islink && lp->islink) ||
                        (islink == lp->islink &&
                         libcmp(ent->d_name, lp->name) > 0))
                {
                    /* let's use the new one */
                    free(lp->name);
                    lp->name = xstrdup(ent->d_name);
                    lp->libtype = libtype;
                    lp->islink = islink;
                }
                break;
            }
        }
 
        /* congratulations, you're the first one we've seen */
        if (!lp)
        {
            lp = xmalloc(sizeof *lp);
            lp->so = xstrdup(so);
            lp->name = xstrdup(ent->d_name);
            lp->libtype = libtype;
            lp->islink = islink;
            lp->next = libs;
            libs = lp;
        }
 
        free(so);
    }
 
    /* don't need this any more */
    closedir(dir);
 
    /* now we have all the latest libs, update the links */
    for (lp = libs; lp; lp = lp->next)
    {
        if (!lp->islink)
            link_shlib(name, lp->name, lp->so);
#ifdef USE_CACHE
        if (!nocache)
            cache_dolib(name, lp->so, lp->libtype);
#endif
    }
 
    /* always try to clean up after ourselves */
    while (libs)
    {
        lp = libs->next;
        free(libs->so);
        free(libs->name);
        free(libs);
        libs = lp;
    }
 
    free(path);
    return;
}
 
/* return the list of system-specific directories */
char *get_extpath(void)
{
    char *res = NULL, *cp;
    FILE *file;
    struct stat stat;
 
    if ((file = fopen(conffile, "r")) != NULL)
    {
        fstat(fileno(file), &stat);
        res = xmalloc(stat.st_size + 1);
        fread(res, 1, stat.st_size, file);
        fclose(file);
        res[stat.st_size] = '\0';
 
        /* convert comments fo spaces */
        for (cp = res; *cp; /*nada*/) {
            if (*cp == '#') {
                do
                    *cp++ = ' ';
                while (*cp && *cp != '\n');
            } else {
                cp++;
            }
        }
    }
 
    return res;
}
 
#ifdef USE_CACHE
typedef struct liblist
{
    int flags;
    int sooffset;
    int liboffset;
    char *soname;
    char *libname;
    struct liblist *next;
} liblist_t;
 
static header_t magic = { LDSO_CACHE_MAGIC, LDSO_CACHE_VER, 0 };
static liblist_t *lib_head = NULL;
 
static int liblistcomp(liblist_t *x, liblist_t *y)
{
    int res;
 
    if ((res = libcmp(x->soname, y->soname)) == 0)
    {
        res = libcmp(strrchr(x->libname, '/') + 1,
                strrchr(y->libname, '/') + 1);
    }
 
    return res;
}
 
void cache_dolib(const char *dir, const char *so, int libtype)
{
    char fullpath[PATH_MAX];
    liblist_t *new_lib, *cur_lib;
 
    magic.nlibs++;
    sprintf(fullpath, "%s/%s", dir, so);
    new_lib = xmalloc(sizeof (liblist_t));
    new_lib->flags = libtype;
    new_lib->soname = xstrdup(so);
    new_lib->libname = xstrdup(fullpath);
 
    if (lib_head == NULL || liblistcomp(new_lib, lib_head) > 0)
    {
        new_lib->next = lib_head;
        lib_head = new_lib;
    }
    else
    {
        for (cur_lib = lib_head; cur_lib->next != NULL &&
                liblistcomp(new_lib, cur_lib->next) <= 0;
                cur_lib = cur_lib->next)
            /* nothing */;
        new_lib->next = cur_lib->next;
        cur_lib->next = new_lib;
    }
}
 
void cache_write(void)
{
    int cachefd;
    int stroffset = 0;
    char tempfile[4096];
    liblist_t *cur_lib;
 
    if (!magic.nlibs)
        return;
 
    sprintf(tempfile, "%s~", cachefile);
 
    if (unlink(tempfile) && errno != ENOENT)
        err(EXIT_FATAL,"can't unlink %s (%s)", tempfile, strerror(errno));
 
    if ((cachefd = creat(tempfile, 0644)) < 0)
        err(EXIT_FATAL,"can't create %s (%s)", tempfile, strerror(errno));
 
    if (write(cachefd, &magic, sizeof (header_t)) != sizeof (header_t))
        err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
 
    for (cur_lib = lib_head; cur_lib != NULL; cur_lib = cur_lib->next)
    {
        cur_lib->sooffset = stroffset;
        stroffset += strlen(cur_lib->soname) + 1;
        cur_lib->liboffset = stroffset;
        stroffset += strlen(cur_lib->libname) + 1;
        if (write(cachefd, cur_lib, sizeof (libentry_t)) !=
                sizeof (libentry_t))
            err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
    }
 
    for (cur_lib = lib_head; cur_lib != NULL; cur_lib = cur_lib->next)
    {
        if (write(cachefd, cur_lib->soname, strlen(cur_lib->soname) + 1)
                != strlen(cur_lib->soname) + 1)
            err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
        if (write(cachefd, cur_lib->libname, strlen(cur_lib->libname) + 1)
                != strlen(cur_lib->libname) + 1)
            err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
    }
 
    if (close(cachefd))
        err(EXIT_FATAL,"can't close %s (%s)", tempfile, strerror(errno));
 
    if (chmod(tempfile, 0644))
        err(EXIT_FATAL,"can't chmod %s (%s)", tempfile, strerror(errno));
 
    if (rename(tempfile, cachefile))
        err(EXIT_FATAL,"can't rename %s (%s)", tempfile, strerror(errno));
}
 
void cache_print(void)
{
    caddr_t c;
    struct stat st;
    int fd = 0;
    char *strs;
    header_t *header;
    libentry_t *libent;
 
    if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY))<0)
        err(EXIT_FATAL,"can't read %s (%s)", cachefile, strerror(errno));
    if ((c = mmap(0,st.st_size, PROT_READ, MAP_SHARED ,fd, 0)) == (caddr_t)-1)
        err(EXIT_FATAL,"can't map %s (%s)", cachefile, strerror(errno));
    close(fd);
 
    if (memcmp(((header_t *)c)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
        err(EXIT_FATAL,"%s cache corrupt", cachefile);
 
    if (memcmp(((header_t *)c)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
        err(EXIT_FATAL,"wrong cache version - expected %s", LDSO_CACHE_VER);
 
    header = (header_t *)c;
    libent = (libentry_t *)(c + sizeof (header_t));
    strs = (char *)&libent[header->nlibs];
 
    printf("%d libs found in cache `%s' (version %s)\n",
            header->nlibs, cachefile, LDSO_CACHE_VER);
 
    for (fd = 0; fd < header->nlibs; fd++)
    {
        printf("\t%s ", strs + libent[fd].sooffset);
        switch (libent[fd].flags & ~LIB_ELF64)
        {
            case LIB_DLL:
                printf("(libc4)");
                break;
            case LIB_ELF:
                printf("(ELF%s)", libent[fd].flags & LIB_ELF64 ? "/64" : "");
                break;
            case LIB_ELF_LIBC5:
            case LIB_ELF_LIBC6:
                printf("(libc%d%s)", (libent[fd].flags & ~LIB_ELF64) + 3,
                        libent[fd].flags & LIB_ELF64 ? "/64" : "");
                break;
            default:
                printf("(unknown)");
                break;
        }
        printf(" => %s\n", strs + libent[fd].liboffset);
    }
 
    munmap (c,st.st_size);
}
#else
void cache_print(void)
{
    warnx("Cache support disabled\n");
}
#endif
 
void usage(void)
{
    fprintf(stderr,
            "ldconfig - updates symlinks for shared libraries\n\n"
            "Usage: ldconfig [-DvqnNX] [-f conf] [-C cache] [-r root] dir ...\n"
            "       ldconfig -l [-Dv] lib ...\n"
            "       ldconfig -p\n\nOptions:\n"
            "\t-D:\t\tdebug mode, don't update links\n"
            "\t-v:\t\tverbose mode, print things as we go\n"
            "\t-q:\t\tquiet mode, don't print warnings\n"
            "\t-n:\t\tdon't process standard directories\n"
            "\t-N:\t\tdon't update the library cache\n"
            "\t-X:\t\tdon't update the library links\n"
            "\t-l:\t\tlibrary mode, manually link libraries\n"
            "\t-p:\t\tprint the current library cache\n"
            "\t-f conf :\tuse conf instead of %s\n"
            "\t-C cache:\tuse cache instead of %s\n"
            "\t-r root :\tfirst, do a chroot to the indicated directory\n"
            "\tdir ... :\tdirectories to process\n"
            "\tlib ... :\tlibraries to link\n\n",
            LDSO_CONF, LDSO_CACHE
           );
    exit(EXIT_FATAL);
}
 
#define DIR_SEP      ":, \t\n"
int main(int argc, char **argv)
{
    int i, c;
    int nodefault = 0;
    int printcache = 0;
    char *cp, *dir, *so;
    char *extpath;
    int libtype, islink;
    char *chroot_dir = NULL;
 
    prog = argv[0];
    opterr = 0;
 
    while ((c = getopt(argc, argv, "DvqnNXlpf:C:r:")) != EOF)
        switch (c)
        {
            case 'D':
                debug = 1;              /* debug mode */
                nocache = 1;
                nolinks = 1;
                verbose = 1;
                break;
            case 'v':
                verbose = 1;    /* verbose mode */
                break;
            case 'q':
                if (verbose <= 0)
                    verbose = -1;       /* quiet mode */
                break;
            case 'n':
                nodefault = 1;  /* no default dirs */
                nocache = 1;
                break;
            case 'N':
                nocache = 1;    /* don't build cache */
                break;
            case 'X':
                nolinks = 1;    /* don't update links */
                break;
            case 'l':
                libmode = 1;    /* library mode */
                break;
            case 'p':
                printcache = 1; /* print cache */
                break;
            case 'f':
                conffile = optarg;      /* alternate conf file */
                break;
            case 'C':
                cachefile = optarg;     /* alternate cache file */
                break;
            case 'r':
                chroot_dir = optarg;
                break;
            default:
                usage();
                break;
 
                /* THE REST OF THESE ARE UNDOCUMENTED AND MAY BE REMOVED
                   IN FUTURE VERSIONS. */
        }
 
    if (chroot_dir && *chroot_dir) {
        if (chroot(chroot_dir) < 0)
            err(EXIT_FATAL,"couldn't chroot to %s (%s)", chroot_dir, strerror(errno));
        if (chdir("/") < 0)
            err(EXIT_FATAL,"couldn't chdir to / (%s)", strerror(errno));
    }
 
    /* allow me to introduce myself, hi, my name is ... */
    if (verbose > 0)
        printf("%s: uClibc version\n", argv[0]);
 
    if (printcache)
    {
        /* print the cache -- don't you trust me? */
        cache_print();
        exit(EXIT_OK);
    }
    else if (libmode)
    {
        /* so you want to do things manually, eh? */
 
        /* ok, if you're so smart, which libraries do we link? */
        for (i = optind; i < argc; i++)
        {
            /* split into directory and file parts */
            if (!(cp = strrchr(argv[i], '/')))
            {
                dir = ".";      /* no dir, only a filename */
                cp = argv[i];
            }
            else
            {
                if (cp == argv[i])
                    dir = "/";  /* file in root directory */
                else
                    dir = argv[i];
                *cp++ = '\0';   /* neither of the above */
            }
 
            /* we'd better do a little bit of checking */
            if ((so = is_shlib(dir, cp, &libtype, &islink, LIB_ANY)) == NULL)
                err(EXIT_FATAL,"%s%s%s is not a shared library", dir,
                        (*dir && strcmp(dir, "/")) ? "/" : "", cp);
 
            /* so far, so good, maybe he knows what he's doing */
            link_shlib(dir, cp, so);
        }
    }
    else
    {
        /* the lazy bum want's us to do all the work for him */
 
        /* don't cache dirs on the command line */
        int nocache_save = nocache;
        nocache = 1;
 
        /* OK, which directories should we do? */
        for (i = optind; i < argc; i++)
            scan_dir(argv[i]);
 
        /* restore the desired caching state */
        nocache = nocache_save;
 
        /* look ma, no defaults */
        if (!nodefault)
        {
            /* I guess the defaults aren't good enough */
            if ((extpath = get_extpath()))
            {
                for (cp = strtok(extpath, DIR_SEP); cp;
                        cp = strtok(NULL, DIR_SEP))
                    scan_dir(cp);
                free(extpath);
            }
 
            scan_dir(UCLIBC_RUNTIME_PREFIX "/usr/X11R6/lib");
            scan_dir(UCLIBC_RUNTIME_PREFIX "/usr/lib");
            scan_dir(UCLIBC_RUNTIME_PREFIX "/lib");
        }
 
#ifdef USE_CACHE
        if (!nocache)
            cache_write();
#endif
    }
 
    exit(EXIT_OK);
}
 
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[/] [or1k/] [trunk/] [linux/] [uClibc/] [utils/] [ldconfig.c] - Blame information for rev 1771

Line No.	Rev	Author	Line
1	1325	phoenix	`/*`
2			`* ldconfig - update shared library symlinks`
3			`*`
4			`* usage: ldconfig [-DvqnNX] [-f conf] [-C cache] [-r root] dir ...`
5			`* ldconfig -l [-Dv] lib ...`
6			`* ldconfig -p`
7			`* -D: debug mode, don't update links`
8			`* -v: verbose mode, print things as we go`
9			`* -q: quiet mode, don't print warnings`
10			`* -n: don't process standard directories`
11			`* -N: don't update the library cache`
12			`* -X: don't update the library links`
13			`* -l: library mode, manually link libraries`
14			`* -p: print the current library cache`
15			`* -f conf: use conf instead of /etc/ld.so.conf`
16			`* -C cache: use cache instead of /etc/ld.so.cache`
17			`* -r root: first, do a chroot to the indicated directory`
18			`* dir ...: directories to process`
19			`* lib ...: libraries to link`
20			`*`
21			`* Copyright 1994-2000 David Engel and Mitch D'Souza`
22			`*`
23			`* This program may be used for any purpose as long as this`
24			`* copyright notice is kept.`
25			`*/`
26
27			`#include <stdio.h>`
28			`#include <stdlib.h>`
29			`#include <stdarg.h>`
30			`#include <string.h>`
31			`#include <ctype.h>`
32			`#include <getopt.h>`
33			`#include <dirent.h>`
34			`#include <unistd.h>`
35			`#include <link.h>`
36			`#include <fcntl.h>`
37			`#include <errno.h>`
38			`#include <sys/stat.h>`
39			`#include <sys/mman.h>`
40			`#include <ld_elf.h>`