src/platform_unix.c
author Ryan C. Gordon <icculus@icculus.org>
Mon, 15 Feb 2010 14:02:36 -0500
changeset 1054 57f4af811ffb
parent 1047 18ae36a7f55b
child 1059 2076e853ce57
permissions -rw-r--r--
THIS is Christoph's PHYSFS_stat() work. I've merged some basic ideas from the other patch, which was Indy Sam's work, and cleaned up a few things.
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/*
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 * Unix support routines for PhysicsFS.
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 *
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 * Please see the file LICENSE.txt in the source's root directory.
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 *
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 *  This file written by Ryan C. Gordon.
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 */
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_platforms.h"
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#ifdef PHYSFS_PLATFORM_UNIX
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <dirent.h>
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#include <time.h>
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#include <errno.h>
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#if (!defined PHYSFS_NO_PTHREADS_SUPPORT)
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#include <pthread.h>
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#endif
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#ifdef PHYSFS_HAVE_SYS_UCRED_H
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#  ifdef PHYSFS_HAVE_MNTENT_H
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#    undef PHYSFS_HAVE_MNTENT_H /* don't do both... */
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#  endif
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#  include <sys/mount.h>
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#  include <sys/ucred.h>
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#endif
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#ifdef PHYSFS_HAVE_MNTENT_H
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#include <mntent.h>
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#endif
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#ifdef PHYSFS_HAVE_SYS_MNTTAB_H
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#include <sys/mnttab.h>
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#endif
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#include "physfs_internal.h"
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int __PHYSFS_platformInit(void)
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{
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    return 1;  /* always succeed. */
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} /* __PHYSFS_platformInit */
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int __PHYSFS_platformDeinit(void)
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{
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    return 1;  /* always succeed. */
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} /* __PHYSFS_platformDeinit */
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/* Stub version for platforms without CD-ROM support. */
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void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)
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{
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#if (defined PHYSFS_NO_CDROM_SUPPORT)
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    /* no-op. */
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#elif (defined PHYSFS_HAVE_SYS_UCRED_H)
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    int i;
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    struct statfs *mntbufp = NULL;
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    int mounts = getmntinfo(&mntbufp, MNT_WAIT);
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    for (i = 0; i < mounts; i++)
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    {
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        int add_it = 0;
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        if (strcmp(mntbufp[i].f_fstypename, "iso9660") == 0)
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            add_it = 1;
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        else if (strcmp( mntbufp[i].f_fstypename, "cd9660") == 0)
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            add_it = 1;
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        /* add other mount types here */
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        if (add_it)
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            cb(data, mntbufp[i].f_mntonname);
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    } /* for */
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#elif (defined PHYSFS_HAVE_MNTENT_H)
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    FILE *mounts = NULL;
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    struct mntent *ent = NULL;
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    mounts = setmntent("/etc/mtab", "r");
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    BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, /*return void*/);
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    while ( (ent = getmntent(mounts)) != NULL )
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    {
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        int add_it = 0;
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        if (strcmp(ent->mnt_type, "iso9660") == 0)
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            add_it = 1;
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        /* add other mount types here */
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        if (add_it)
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            cb(data, ent->mnt_dir);
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    } /* while */
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    endmntent(mounts);
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#elif (defined PHYSFS_HAVE_SYS_MNTTAB_H)
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    FILE *mounts = fopen(MNTTAB, "r");
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    struct mnttab ent;
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    BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, /*return void*/);
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    while (getmntent(mounts, &ent) == 0)
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    {
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        int add_it = 0;
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        if (strcmp(ent.mnt_fstype, "hsfs") == 0)
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            add_it = 1;
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        /* add other mount types here */
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        if (add_it)
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            cb(data, ent.mnt_mountp);
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    } /* while */
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    fclose(mounts);
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#else
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#error Unknown platform. Should have defined PHYSFS_NO_CDROM_SUPPORT, perhaps.
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#endif
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} /* __PHYSFS_platformDetectAvailableCDs */
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/* this is in posix.c ... */
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extern char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname);
20
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efdde0d21521 Implementation compiles and links with no actual archive support. No test
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225
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/*
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 * See where program (bin) resides in the $PATH specified by (envr).
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 *  returns a copy of the first element in envr that contains it, or NULL
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 *  if it doesn't exist or there were other problems. PHYSFS_SetError() is
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 *  called if we have a problem.
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 *
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 * (envr) will be scribbled over, and you are expected to allocator.Free() the
225
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 *  return value when you're done with it.
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 */
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static char *findBinaryInPath(const char *bin, char *envr)
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{
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    size_t alloc_size = 0;
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    char *exe = NULL;
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    char *start = envr;
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    char *ptr;
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    BAIL_IF_MACRO(bin == NULL, ERR_INVALID_ARGUMENT, NULL);
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    BAIL_IF_MACRO(envr == NULL, ERR_INVALID_ARGUMENT, NULL);
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    do
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    {
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        size_t size;
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        ptr = strchr(start, ':');  /* find next $PATH separator. */
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        if (ptr)
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            *ptr = '\0';
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        size = strlen(start) + strlen(bin) + 2;
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        if (size > alloc_size)
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        {
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            char *x = (char *) allocator.Realloc(exe, size);
225
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            if (x == NULL)
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            {
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                if (exe != NULL)
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                    allocator.Free(exe);
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                BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
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            } /* if */
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            alloc_size = size;
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            exe = x;
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        } /* if */
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        /* build full binary path... */
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        strcpy(exe, start);
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        if ((exe[0] == '\0') || (exe[strlen(exe) - 1] != '/'))
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            strcat(exe, "/");
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        strcat(exe, bin);
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        if (access(exe, X_OK) == 0)  /* Exists as executable? We're done. */
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        {
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            strcpy(exe, start);  /* i'm lazy. piss off. */
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            return exe;
225
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        } /* if */
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        start = ptr + 1;  /* start points to beginning of next element. */
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    } while (ptr != NULL);
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    if (exe != NULL)
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        allocator.Free(exe);
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    return NULL;  /* doesn't exist in path. */
225
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} /* findBinaryInPath */
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static char *readSymLink(const char *path)
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{
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    ssize_t len = 64;
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    ssize_t rc = -1;
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    char *retval = NULL;
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    while (1)
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    {
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         char *ptr = (char *) allocator.Realloc(retval, (size_t) len);
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         if (ptr == NULL)
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             break;   /* out of memory. */
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         retval = ptr;
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         rc = readlink(path, retval, len);
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         if (rc == -1)
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             break;  /* not a symlink, i/o error, etc. */
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         else if (rc < len)
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         {
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             retval[rc] = '\0';  /* readlink doesn't null-terminate. */
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             return retval;  /* we're good to go. */
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         } /* else if */
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         len *= 2;  /* grow buffer, try again. */
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    } /* while */
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    if (retval != NULL)
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        allocator.Free(retval);
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    return NULL;
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} /* readSymLink */
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23
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char *__PHYSFS_platformCalcBaseDir(const char *argv0)
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{
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    char *retval = NULL;
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    char *envr = NULL;
23
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    /* fast path: default behaviour can handle this. */
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    if ( (argv0 != NULL) && (strchr(argv0, '/') != NULL) )
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        return NULL;  /* higher level will parse out real path from argv0. */
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    /*
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     * Try to avoid using argv0 unless forced to. If there's a Linux-like
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     *  /proc filesystem, you can get the full path to the current process from
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     *  the /proc/self/exe symlink.
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     */
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    retval = readSymLink("/proc/self/exe");
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    if (retval == NULL)
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    {
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        /* older kernels don't have /proc/self ... try PID version... */
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        const unsigned long long pid = (unsigned long long) getpid();
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        char path[64];
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        const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);
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        if ( (rc > 0) && (rc < sizeof(path)) )
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            retval = readSymLink(path);
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   256
    } /* if */
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    if (retval != NULL)  /* chop off filename. */
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    {
1001
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        char *ptr = strrchr(retval, '/');
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        if (ptr != NULL)
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            *ptr = '\0';
840
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    } /* if */
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840
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    if ((retval == NULL) && (argv0 != NULL))
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    {
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        /* If there's no dirsep on argv0, then look through $PATH for it. */
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        envr = __PHYSFS_platformCopyEnvironmentVariable("PATH");
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        BAIL_IF_MACRO(!envr, NULL, NULL);
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        retval = findBinaryInPath(argv0, envr);
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        allocator.Free(envr);
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    } /* if */
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1002
001380a457a0 Try to shrink returned buffer's allocation.
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    if (retval != NULL)
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    {
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        /* try to shrink buffer... */
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        char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1);
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        if (ptr != NULL)
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            retval = ptr;  /* oh well if it failed. */
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    } /* if */
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    return retval;
23
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} /* __PHYSFS_platformCalcBaseDir */
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39
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char *__PHYSFS_platformRealPath(const char *path)
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{
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    char resolved_path[MAXPATHLEN];
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    char *retval = NULL;
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    errno = 0;
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    BAIL_IF_MACRO(!realpath(path, resolved_path), strerror(errno), NULL);
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    retval = (char *) allocator.Malloc(strlen(resolved_path) + 1);
39
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    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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    strcpy(retval, resolved_path);
520
a72bbf255074 Added hack for OSX bundles, from Eric Wing.
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    return retval;
39
bc29e1ee7ef6 Lots of bugfixes, enhancements, and corrections due to the work on
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} /* __PHYSFS_platformRealPath */
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69
546a95cc5591 Updates, corrections and enhancements to get this ported to win32.
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847
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char *__PHYSFS_platformCurrentDir(void)
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{
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    /*
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     * This can't just do platformRealPath("."), since that would eventually
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     *  just end up calling back into here.
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     */
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   307
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    int allocSize = 0;
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    char *retval = NULL;
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    char *ptr;
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    do
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    {
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        allocSize += 100;
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        ptr = (char *) allocator.Realloc(retval, allocSize);
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        if (ptr == NULL)
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        {
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            if (retval != NULL)
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                allocator.Free(retval);
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            BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
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   321
        } /* if */
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   322
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        retval = ptr;
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        ptr = getcwd(retval, allocSize);
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   325
    } while (ptr == NULL && errno == ERANGE);
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   326
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   327
    if (ptr == NULL && errno)
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   328
    {
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   329
            /*
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   330
             * getcwd() failed for some reason, for example current
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   331
             * directory not existing.
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   332
             */
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   333
        if (retval != NULL)
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   334
            allocator.Free(retval);
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   335
        BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
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   336
    } /* if */
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   337
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957c97389257 Cleaned up returns that look like function calls for my updated coding style.
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    return retval;
847
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   339
} /* __PHYSFS_platformCurrentDir */
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   340
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   341
845
3f150ffcf50c Since all the platform layers were using the same cut-and-paste of the
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   342
int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)
3f150ffcf50c Since all the platform layers were using the same cut-and-paste of the
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   343
{
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   344
    return 0;  /* just use malloc() and friends. */
845
3f150ffcf50c Since all the platform layers were using the same cut-and-paste of the
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   345
} /* __PHYSFS_platformSetDefaultAllocator */
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diff changeset
   346
3f150ffcf50c Since all the platform layers were using the same cut-and-paste of the
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   347
1054
57f4af811ffb THIS is Christoph's PHYSFS_stat() work.
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diff changeset
   348
#if (defined PHYSFS_NO_PTHREADS_SUPPORT)
390
6649d6caecf2 Stub code for platforms without functional pthreads.
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   349
1016
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   350
void *__PHYSFS_platformGetThreadID(void) { return ((void *) 0x0001); }
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   351
void *__PHYSFS_platformCreateMutex(void) { return ((void *) 0x0001); }
390
6649d6caecf2 Stub code for platforms without functional pthreads.
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diff changeset
   352
void __PHYSFS_platformDestroyMutex(void *mutex) {}
1016
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   353
int __PHYSFS_platformGrabMutex(void *mutex) { return 1; }
390
6649d6caecf2 Stub code for platforms without functional pthreads.
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   354
void __PHYSFS_platformReleaseMutex(void *mutex) {}
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   355
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diff changeset
   356
#else
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   357
889
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   358
typedef struct
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   359
{
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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   360
    pthread_mutex_t mutex;
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   361
    pthread_t owner;
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   362
    PHYSFS_uint32 count;
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   363
} PthreadMutex;
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diff changeset
   364
452
89578e99ba6e Attempt to fix pthread-to-ui64 cast issue.
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diff changeset
   365
1012
f254870dd7dd Attempt to clean up the thread ID mess in platform_unix ...
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diff changeset
   366
void *__PHYSFS_platformGetThreadID(void)
390
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   367
{
1016
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   368
    return ( (void *) ((size_t) pthread_self()) );
390
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diff changeset
   369
} /* __PHYSFS_platformGetThreadID */
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   370
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diff changeset
   371
145
d6385584f6c4 First shot at thread-safety.
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diff changeset
   372
void *__PHYSFS_platformCreateMutex(void)
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   373
{
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   374
    int rc;
889
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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   375
    PthreadMutex *m = (PthreadMutex *) allocator.Malloc(sizeof (PthreadMutex));
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   376
    BAIL_IF_MACRO(m == NULL, ERR_OUT_OF_MEMORY, NULL);
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   377
    rc = pthread_mutex_init(&m->mutex, NULL);
145
d6385584f6c4 First shot at thread-safety.
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diff changeset
   378
    if (rc != 0)
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diff changeset
   379
    {
691
71d9affe0d8a All memory management now goes through allocation hooks instead of directly to
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diff changeset
   380
        allocator.Free(m);
145
d6385584f6c4 First shot at thread-safety.
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diff changeset
   381
        BAIL_MACRO(strerror(rc), NULL);
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diff changeset
   382
    } /* if */
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diff changeset
   383
889
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   384
    m->count = 0;
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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   385
    m->owner = (pthread_t) 0xDEADBEEF;
1016
957c97389257 Cleaned up returns that look like function calls for my updated coding style.
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diff changeset
   386
    return ((void *) m);
145
d6385584f6c4 First shot at thread-safety.
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   387
} /* __PHYSFS_platformCreateMutex */
d6385584f6c4 First shot at thread-safety.
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diff changeset
   388
d6385584f6c4 First shot at thread-safety.
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diff changeset
   389
d6385584f6c4 First shot at thread-safety.
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   390
void __PHYSFS_platformDestroyMutex(void *mutex)
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diff changeset
   391
{
889
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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diff changeset
   392
    PthreadMutex *m = (PthreadMutex *) mutex;
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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diff changeset
   393
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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   394
    /* Destroying a locked mutex is a bug, but we'll try to be helpful. */
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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diff changeset
   395
    if ((m->owner == pthread_self()) && (m->count > 0))
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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parents: 847
diff changeset
   396
        pthread_mutex_unlock(&m->mutex);
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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diff changeset
   397
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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diff changeset
   398
    pthread_mutex_destroy(&m->mutex);
757
50e6457e78be Made unix mutexes recursive.
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parents: 691
diff changeset
   399
    allocator.Free(m);
145
d6385584f6c4 First shot at thread-safety.
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diff changeset
   400
} /* __PHYSFS_platformDestroyMutex */
d6385584f6c4 First shot at thread-safety.
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parents: 137
diff changeset
   401
d6385584f6c4 First shot at thread-safety.
Ryan C. Gordon <icculus@icculus.org>
parents: 137
diff changeset
   402
d6385584f6c4 First shot at thread-safety.
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diff changeset
   403
int __PHYSFS_platformGrabMutex(void *mutex)
d6385584f6c4 First shot at thread-safety.
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parents: 137
diff changeset
   404
{
889
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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parents: 847
diff changeset
   405
    PthreadMutex *m = (PthreadMutex *) mutex;
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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parents: 847
diff changeset
   406
    pthread_t tid = pthread_self();
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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parents: 847
diff changeset
   407
    if (m->owner != tid)
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   408
    {
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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parents: 847
diff changeset
   409
        if (pthread_mutex_lock(&m->mutex) != 0)
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957c97389257 Cleaned up returns that look like function calls for my updated coding style.
Ryan C. Gordon <icculus@icculus.org>
parents: 1012
diff changeset
   410
            return 0;
889
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   411
        m->owner = tid;
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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parents: 847
diff changeset
   412
    } /* if */
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   413
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
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diff changeset
   414
    m->count++;
1016
957c97389257 Cleaned up returns that look like function calls for my updated coding style.
Ryan C. Gordon <icculus@icculus.org>
parents: 1012
diff changeset
   415
    return 1;
145
d6385584f6c4 First shot at thread-safety.
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parents: 137
diff changeset
   416
} /* __PHYSFS_platformGrabMutex */
d6385584f6c4 First shot at thread-safety.
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parents: 137
diff changeset
   417
d6385584f6c4 First shot at thread-safety.
Ryan C. Gordon <icculus@icculus.org>
parents: 137
diff changeset
   418
d6385584f6c4 First shot at thread-safety.
Ryan C. Gordon <icculus@icculus.org>
parents: 137
diff changeset
   419
void __PHYSFS_platformReleaseMutex(void *mutex)
d6385584f6c4 First shot at thread-safety.
Ryan C. Gordon <icculus@icculus.org>
parents: 137
diff changeset
   420
{
889
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   421
    PthreadMutex *m = (PthreadMutex *) mutex;
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   422
    if (m->owner == pthread_self())
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   423
    {
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   424
        if (--m->count == 0)
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   425
        {
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   426
            m->owner = (pthread_t) 0xDEADBEEF;
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   427
            pthread_mutex_unlock(&m->mutex);
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   428
        } /* if */
0364fa566f29 Reverted change r857:858...recursive mutex APIs sort of suck for portability.
Ryan C. Gordon <icculus@icculus.org>
parents: 847
diff changeset
   429
    } /* if */
145
d6385584f6c4 First shot at thread-safety.
Ryan C. Gordon <icculus@icculus.org>
parents: 137
diff changeset
   430
} /* __PHYSFS_platformReleaseMutex */
d6385584f6c4 First shot at thread-safety.
Ryan C. Gordon <icculus@icculus.org>
parents: 137
diff changeset
   431
1054
57f4af811ffb THIS is Christoph's PHYSFS_stat() work.
Ryan C. Gordon <icculus@icculus.org>
parents: 1047
diff changeset
   432
#endif /* !PHYSFS_NO_PTHREADS_SUPPORT */
390
6649d6caecf2 Stub code for platforms without functional pthreads.
Ryan C. Gordon <icculus@icculus.org>
parents: 381
diff changeset
   433
818
e36f23f49042 Now compiles everything whether we need it or not, removing whole files with
Ryan C. Gordon <icculus@icculus.org>
parents: 809
diff changeset
   434
#endif /* PHYSFS_PLATFORM_UNIX */
233
1b74a7df1ca6 Split some of the unix.c code out to posix.c for BeOS to use.
Ryan C. Gordon <icculus@icculus.org>
parents: 225
diff changeset
   435
17
7337737f5120 Moved from root source dir.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   436
/* end of unix.c ... */
7337737f5120 Moved from root source dir.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   437