/
platform_unix.c
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/**
* MojoSetup; a portable, flexible installation application.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
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#if PLATFORM_UNIX
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#if PLATFORM_MACOSX
#include <Carbon/Carbon.h>
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#undef true
#undef false
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#endif
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#include <sys/time.h>
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
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#include <sys/utsname.h>
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#include <sys/mount.h>
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#include <stdio.h>
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#include <time.h>
#include <unistd.h>
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#include <signal.h>
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#include <syslog.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include <limits.h>
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#include <errno.h>
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#if MOJOSETUP_HAVE_SYS_UCRED_H
# ifdef MOJOSETUP_HAVE_MNTENT_H
# undef MOJOSETUP_HAVE_MNTENT_H /* don't do both... */
# endif
# include <sys/ucred.h>
#endif
#if MOJOSETUP_HAVE_MNTENT_H
# include <mntent.h>
#endif
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#if MOJOSETUP_HAVE_SYS_MNTTAB_H
# include <sys/mnttab.h>
#endif
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#if PLATFORM_BEOS
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#define DLOPEN_ARGS 0
void *beos_dlopen(const char *fname, int unused);
void *beos_dlsym(void *lib, const char *sym);
void beos_dlclose(void *lib);
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void beos_usleep(unsigned long ticks);
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#define dlopen beos_dlopen
#define dlsym beos_dlsym
#define dlclose beos_dlclose
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#define usleep beos_usleep
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#else
#include <dlfcn.h>
#define DLOPEN_ARGS (RTLD_NOW | RTLD_GLOBAL)
#endif
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#include "platform.h"
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#include "gui.h"
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#include "fileio.h"
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static struct timeval startup_time;
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boolean MojoPlatform_istty(void)
{
static boolean already_checked = false; // this never changes in a run.
static boolean retval = false;
if (!already_checked)
{
retval = isatty(0) && isatty(1) ? true : false;
already_checked = true;
} // if
return retval;
} // MojoPlatform_istty
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char *MojoPlatform_currentWorkingDir(void)
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{
char *retval = NULL;
size_t len;
// loop a few times in case we don't have a large enough buffer.
for (len = 128; len <= (16*1024); len *= 2)
{
retval = (char *) xrealloc(retval, len);
if (getcwd(retval, len-1) != NULL)
{
size_t slen = strlen(retval);
if (retval[slen-1] != '/') // make sure this ends with '/' ...
{
retval[slen] = '/';
retval[slen+1] = '\0';
} // if
return retval;
} // if
} // for
free(retval);
return NULL;
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} // MojoPlatform_currentWorkingDir
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char *MojoPlatform_readlink(const char *linkname)
{
size_t alloclen = 16;
char *retval = NULL;
char *buf = NULL;
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ssize_t len = -1;
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do
{
alloclen *= 2;
buf = xrealloc(buf, alloclen);
len = readlink(linkname, buf, alloclen-1);
if ( (len != -1) && (len < (alloclen-1)) ) // !error && !overflow
{
buf[len] = '\0'; // readlink() doesn't null-terminate!
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retval = xrealloc(buf, (size_t) (len+1)); // shrink it down.
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} // if
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} while (len >= (((ssize_t)alloclen)-1)); // loop if we need bigger buf.
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return retval; // caller must free() this.
} // MojoPlatform_readlink
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static void *guaranteeAllocation(void *ptr, size_t len, size_t *_alloclen)
{
void *retval = NULL;
size_t alloclen = *_alloclen;
if (alloclen > len)
return ptr;
if (!alloclen)
alloclen = 1;
while (alloclen <= len)
alloclen *= 2;
retval = xrealloc(ptr, alloclen);
if (retval != NULL)
*_alloclen = alloclen;
return retval;
} // guaranteeAllocation
// This is a mess, but I'm not sure it can be done more cleanly.
static char *realpathInternal(char *path, const char *cwd, int linkloop)
{
char *linkname = NULL;
char *retval = NULL;
size_t len = 0;
size_t alloclen = 0;
if (*path == '/') // absolute path.
{
retval = xstrdup("/");
path++;
len = 1;
} // if
else // relative path.
{
if (cwd != NULL)
retval = xstrdup(cwd);
else
{
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if ((retval = MojoPlatform_currentWorkingDir()) == NULL)
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return NULL;
} // else
len = strlen(retval);
} // else
while (true)
{
struct stat statbuf;
size_t newlen;
char *nextpath = strchr(path, '/');
if (nextpath != NULL)
*nextpath = '\0';
newlen = strlen(path);
retval = guaranteeAllocation(retval, len + newlen + 2, &alloclen);
strcpy(retval + len, path);
if (*path == '\0')
retval[--len] = '\0'; // chop ending "/" bit, it gets readded later.
else if (strcmp(path, ".") == 0)
{
retval[--len] = '\0'; // chop ending "/." bit
} // else if
else if (strcmp(path, "..") == 0)
{
char *ptr;
retval[--len] = '\0'; // chop ending "/.." bit
ptr = strrchr(retval, '/');
if ((ptr == NULL) || (ptr == retval))
{
strcpy(retval, "/");
len = 0;
} // if
else
{
*ptr = '\0';
len -= (size_t) ((retval+len)-ptr);
} // else
} // else if
// it may be a symlink...check it.
else if (lstat(retval, &statbuf) == -1)
goto realpathInternal_failed;
else if (S_ISLNK(statbuf.st_mode))
{
char *newresolve = NULL;
if (linkloop > 255)
goto realpathInternal_failed;
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linkname = MojoPlatform_readlink(retval);
if (linkname == NULL)
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goto realpathInternal_failed;
// chop off symlink name for its cwd.
retval[len] = '\0';
// resolve the link...
newresolve = realpathInternal(linkname, retval, linkloop + 1);
if (newresolve == NULL)
goto realpathInternal_failed;
len = strlen(newresolve);
retval = guaranteeAllocation(retval, len + 2, &alloclen);
strcpy(retval, newresolve);
free(newresolve);
free(linkname);
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linkname = NULL;
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} // else if
else
{
len += newlen;
} // else
if (nextpath == NULL)
break; // holy crap we're done!
else // append a '/' before the next path element.
{
path = nextpath + 1;
retval[len++] = '/';
retval[len] = '\0';
} // else
} // while
// Shrink string if we're using more memory than necessary...
if (alloclen > len+1)
retval = (char *) xrealloc(retval, len+1);
return retval;
realpathInternal_failed:
free(linkname);
free(retval);
return NULL;
} // realpathInternal
// Rolling my own realpath, even if the runtime has one, since apparently
// the spec is a little flakey, and it can overflow PATH_MAX. On BeOS <= 5,
// we'd have to resort to BPath to do this, too, and I'd rather avoid the C++
// dependencies and headers.
char *MojoPlatform_realpath(const char *_path)
{
char *path = xstrdup(_path);
char *retval = realpathInternal(path, NULL, 0);
free(path);
return retval;
} // MojoPlatform_realpath
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// (Stolen from physicsfs: http://icculus.org/physfs/ ...)
/*
* See where program (bin) resides in the $PATH. Returns a copy of the first
* element in $PATH that contains it, or NULL if it doesn't exist or there
* were other problems.
*
* You are expected to free() the return value when you're done with it.
*/
static char *findBinaryInPath(const char *bin)
{
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const char *_envr = getenv("PATH");
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size_t alloc_size = 64;
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char *envr = NULL;
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char *exe = NULL;
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char *start = NULL;
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char *ptr = NULL;
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if ((_envr == NULL) || (bin == NULL))
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return NULL;
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envr = xstrdup(_envr);
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exe = (char *) xmalloc(alloc_size);
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start = envr;
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do
{
size_t size;
ptr = strchr(start, ':'); // find next $PATH separator.
if (ptr)
*ptr = '\0';
size = strlen(start) + strlen(bin) + 2;
if (size > alloc_size)
{
char *x = (char *) xrealloc(exe, size);
alloc_size = size;
exe = x;
} // if
// build full binary path...
strcpy(exe, start);
if ((exe[0] == '\0') || (exe[strlen(exe) - 1] != '/'))
strcat(exe, "/");
strcat(exe, bin);
if (access(exe, X_OK) == 0) // Exists as executable? We're done.
{
strcpy(exe, start); // i'm lazy. piss off.
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free(envr);
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return(exe);
} // if
start = ptr + 1; // start points to beginning of next element.
} while (ptr != NULL);
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free(exe);
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free(envr);
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return NULL; // doesn't exist in path.
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} // findBinaryInPath
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char *MojoPlatform_appBinaryPath(void)
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{
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const char *argv0 = GArgv[0];
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char *retval = NULL;
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// !!! FIXME: try /proc/$PID/exe here?
if (strchr(argv0, '/') != NULL)
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retval = MojoPlatform_realpath(argv0); // argv[0] contains a path?
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else // slow path...have to search the whole $PATH for this one...
{
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char *found = findBinaryInPath(argv0);
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if (found)
retval = MojoPlatform_realpath(found);
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free(found);
} // else
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return retval;
} // MojoPlatform_appBinaryPath
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char *MojoPlatform_homedir(void)
{
const char *envr = getenv("HOME");
return xstrdup(envr ? envr : "/");
} // MojoPlatform_homedir
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// This implementation is a bit naive.
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char *MojoPlatform_locale(void)
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{
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char *retval = NULL;
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char *ptr = NULL;
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const char *envr = getenv("LANG");
if (envr != NULL)
{
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retval = xstrdup(envr);
ptr = strchr(retval, '.'); // chop off encoding if explicitly listed.
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if (ptr != NULL)
*ptr = '\0';
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ptr = strchr(retval, '@'); // chop off extra bits if explicitly listed.
if (ptr != NULL)
*ptr = '\0';
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} // if
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#if PLATFORM_MACOSX
else if (CFLocaleCreateCanonicalLocaleIdentifierFromString == NULL)
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retval = NULL; // !!! FIXME: 10.2 compatibility?
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else if (CFLocaleCreateCanonicalLocaleIdentifierFromString != NULL)
{
CFPropertyListRef languages = CFPreferencesCopyAppValue(
CFSTR("AppleLanguages"),
kCFPreferencesCurrentApplication);
if (languages != NULL)
{
CFStringRef primary = CFArrayGetValueAtIndex(languages, 0);
if (primary != NULL)
{
CFStringRef locale =
CFLocaleCreateCanonicalLocaleIdentifierFromString(
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kCFAllocatorDefault, primary);
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if (locale != NULL)
{
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const CFIndex len = (CFStringGetLength(locale) + 1) * 6;
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ptr = (char*) xmalloc(len);
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CFStringGetCString(locale, ptr, len, kCFStringEncodingUTF8);
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CFRelease(locale);
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retval = xrealloc(ptr, strlen(ptr) + 1);
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// !!! FIXME: this may not be 100% right, but change
// !!! FIXME: xx-YY to xx_YY (lang_country).
if (retval[2] == '-')
retval[2] = '_';
if (retval[3] == '-')
retval[3] = '_';
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} // if
} // if
CFRelease(languages);
} // if
} // else if
#endif
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return retval;
} // MojoPlatform_locale
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char *MojoPlatform_osType(void)
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{
#if PLATFORM_MACOSX
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return xstrdup("macosx");
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#elif PLATFORM_BEOS
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return xstrdup("beos"); // !!! FIXME: zeta? haiku?
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#elif defined(linux) || defined(__linux) || defined(__linux__)
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return xstrdup("linux");
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#elif defined(__FreeBSD__) || defined(__DragonFly__)
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return xstrdup("freebsd");
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#elif defined(__NetBSD__)
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return xstrdup("netbsd");
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#elif defined(__OpenBSD__)
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return xstrdup("openbsd");
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#elif defined(bsdi) || defined(__bsdi) || defined(__bsdi__)
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return xstrdup("bsdi");
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#elif defined(_AIX)
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return xstrdup("aix");
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#elif defined(hpux) || defined(__hpux) || defined(__hpux__)
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return xstrdup("hpux");
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#elif defined(sgi) || defined(__sgi) || defined(__sgi__) || defined(_SGI_SOURCE)
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return xstrdup("irix");
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#elif defined(sun)
return xstrdup("solaris");
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#else
# error Please define your platform.
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return NULL;
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#endif
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} // MojoPlatform_ostype
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char *MojoPlatform_osVersion(void)
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{
#if PLATFORM_MACOSX
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SInt32 ver, major, minor, patch;
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boolean convert = false;
char *buf = NULL;
char dummy = 0;
int len = 0;
if (Gestalt(gestaltSystemVersion, &ver) != noErr)
return NULL;
if (ver < 0x1030)
convert = true; // split (ver) into (major),(minor),(patch).
else
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{
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// presumably this won't fail. But if it does, we'll just use the
// original version value. This might cut the value--10.12.11 will
// come out to 10.9.9, for example--but it's better than nothing.
if (Gestalt(gestaltSystemVersionMajor, &major) != noErr)
convert = true;
if (Gestalt(gestaltSystemVersionMinor, &minor) != noErr)
convert = true;
if (Gestalt(gestaltSystemVersionBugFix, &patch) != noErr)
convert = true;
} /* else */
if (convert)
{
major = ((ver & 0xFF00) >> 8);
major = (((major / 16) * 10) + (major % 16));
minor = ((ver & 0xF0) >> 4);
patch = (ver & 0xF);
} /* if */
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len = snprintf(&dummy, sizeof (dummy), "%d.%d.%d",
(int) major, (int) minor, (int) patch);
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buf = (char *) xmalloc(len+1);
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snprintf(buf, len+1, "%d.%d.%d", (int) major, (int) minor, (int) patch);
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return buf;
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#else
// This information may or may not actually MEAN anything. On BeOS, it's
// useful, but on other things, like Linux, it'll give you the kernel
// version, which doesn't necessarily help.
struct utsname un;
if (uname(&un) == 0)
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return xstrdup(un.release);
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#endif
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return NULL;
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} // MojoPlatform_osversion
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char *MojoPlatform_osMachine(void)
{
struct utsname un;
if (uname(&un) == 0)
return xstrdup(un.machine);
return NULL;
} // MojoPlatform_osMachine
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void MojoPlatform_sleep(uint32 ticks)
{
usleep(ticks * 1000);
} // MojoPlatform_sleep
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uint32 MojoPlatform_ticks(void)
{
uint64 then_ms, now_ms;
struct timeval now;
gettimeofday(&now, NULL);
then_ms = (((uint64) startup_time.tv_sec) * 1000) +
(((uint64) startup_time.tv_usec) / 1000);
now_ms = (((uint64) now.tv_sec) * 1000) + (((uint64) now.tv_usec) / 1000);
return ((uint32) (now_ms - then_ms));
} // MojoPlatform_ticks
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void MojoPlatform_die(void)
{
_exit(86);
} // MojoPlatform_die
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boolean MojoPlatform_unlink(const char *fname)
{
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boolean retval = false;
struct stat statbuf;
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if (lstat(fname, &statbuf) != -1)
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{
if (S_ISDIR(statbuf.st_mode))
retval = (rmdir(fname) == 0);
else
retval = (unlink(fname) == 0);
} // if
return retval;
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} // MojoPlatform_unlink
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boolean MojoPlatform_symlink(const char *src, const char *dst)
{
return (symlink(dst, src) == 0);
} // MojoPlatform_symlink
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boolean MojoPlatform_mkdir(const char *path, uint16 perms)
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{
// !!! FIXME: error if already exists?
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return (mkdir(path, perms) == 0);
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} // MojoPlatform_mkdir
boolean MojoPlatform_rename(const char *src, const char *dst)
{
return (rename(src, dst) == 0);
} // MojoPlatform_rename
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boolean MojoPlatform_exists(const char *dir, const char *fname)
{
boolean retval = false;
if (fname == NULL)
retval = (access(dir, F_OK) != -1);
else
{
const size_t len = strlen(dir) + strlen(fname) + 2;
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char *buf = (char *) xmalloc(len);
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snprintf(buf, len, "%s/%s", dir, fname);
retval = (access(buf, F_OK) != -1);
free(buf);
} // else
return retval;
} // MojoPlatform_exists
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boolean MojoPlatform_writable(const char *fname)
{
return (access(fname, W_OK) == 0);
} // MojoPlatform_writable
boolean MojoPlatform_isdir(const char *dir)
{
boolean retval = false;
struct stat statbuf;
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if (lstat(dir, &statbuf) != -1)
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{
if (S_ISDIR(statbuf.st_mode))
retval = true;
} // if
return retval;
} // MojoPlatform_isdir
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boolean MojoPlatform_issymlink(const char *dir)
{
boolean retval = false;
struct stat statbuf;
if (lstat(dir, &statbuf) != -1)
{
if (S_ISLNK(statbuf.st_mode))
retval = true;
} // if
return retval;
} // MojoPlatform_issymlink
boolean MojoPlatform_isfile(const char *dir)
{
boolean retval = false;
struct stat statbuf;
if (lstat(dir, &statbuf) != -1)
{
if (S_ISREG(statbuf.st_mode))
retval = true;
} // if
return retval;
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} // MojoPlatform_isfile
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void *MojoPlatform_stdout(void)
{
int *retval = (int *) xmalloc(sizeof (int));
*retval = 1; // stdout.
return retval;
} // MojoPlatform_stdout
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void *MojoPlatform_open(const char *fname, uint32 flags, uint16 mode)
{
void *retval = NULL;
int fd = -1;
int unixflags = 0;
if ((flags & MOJOFILE_READ) && (flags & MOJOFILE_WRITE))
unixflags |= O_RDWR;
else if (flags & MOJOFILE_READ)
unixflags |= O_RDONLY;
else if (flags & MOJOFILE_WRITE)
unixflags |= O_WRONLY;
else
return NULL; // have to specify SOMETHING.
if (flags & MOJOFILE_APPEND)
unixflags |= O_APPEND;
if (flags & MOJOFILE_TRUNCATE)
unixflags |= O_TRUNC;
if (flags & MOJOFILE_CREATE)
unixflags |= O_CREAT;
if (flags & MOJOFILE_EXCLUSIVE)
unixflags |= O_EXCL;
fd = open(fname, unixflags, (mode_t) mode);
if (fd != -1)
{
int *intptr = (int *) xmalloc(sizeof (int));
*intptr = fd;
retval = intptr;
} // if
return retval;
} // MojoPlatform_open
int64 MojoPlatform_read(void *fd, void *buf, uint32 bytes)
{
return (int64) read(*((int *) fd), buf, bytes);
} // MojoPlatform_read
int64 MojoPlatform_write(void *fd, const void *buf, uint32 bytes)
{
return (int64) write(*((int *) fd), buf, bytes);
} // MojoPlatform_write
int64 MojoPlatform_tell(void *fd)
{
return (int64) lseek(*((int *) fd), 0, SEEK_CUR);
} // MojoPlatform_tell
int64 MojoPlatform_seek(void *fd, int64 offset, MojoFileSeek whence)
{
int unixwhence;
switch (whence)
{
case MOJOSEEK_SET: unixwhence = SEEK_SET; break;
case MOJOSEEK_CURRENT: unixwhence = SEEK_CUR; break;
case MOJOSEEK_END: unixwhence = SEEK_END; break;
default: return -1; // !!! FIXME: maybe just abort?
} // switch
return (int64) lseek(*((int *) fd), offset, unixwhence);
} // MojoPlatform_seek
int64 MojoPlatform_flen(void *fd)
{
struct stat statbuf;
if (fstat(*((int *) fd), &statbuf) == -1)
return -1;
return((int64) statbuf.st_size);
} // MojoPlatform_flen
boolean MojoPlatform_flush(void *fd)
{
return (fsync(*((int *) fd)) == 0);
} // MojoPlatform_flush
boolean MojoPlatform_close(void *fd)
{
boolean retval = false;
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int handle = *((int *) fd);
// don't close stdin, stdout, or stderr.
if ((handle == 0) || (handle == 1) || (handle == 2))
{
free(fd);
return true;
} // if
if (close(handle) == 0)
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free(fd);
return retval;
} // MojoPlatform_close
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void *MojoPlatform_opendir(const char *dirname)
{
return opendir(dirname);
} // MojoPlatform_opendir
char *MojoPlatform_readdir(void *_dirhandle)
{
DIR *dirhandle = (DIR *) _dirhandle;
struct dirent *dent = NULL;
while ((dent = readdir(dirhandle)) != NULL)
{
if (strcmp(dent->d_name, ".") == 0)
continue; // skip these.
else if (strcmp(dent->d_name, "..") == 0)
continue; // skip these, too.
else
break; // found a valid entry, go on.
} // while
return ((dent) ? xstrdup(dent->d_name) : NULL);
} // MojoPlatform_readdir
void MojoPlatform_closedir(void *dirhandle)
{
closedir((DIR *) dirhandle);
} // MojoPlatform_closedir
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int64 MojoPlatform_filesize(const char *fname)
{
int retval = -1;
struct stat statbuf;
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if ( (lstat(fname, &statbuf) != -1) && (S_ISREG(statbuf.st_mode)) )
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retval = (int64) statbuf.st_size;
return retval;
} // MojoPlatform_filesize
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boolean MojoPlatform_perms(const char *fname, uint16 *p)
{
boolean retval = false;
struct stat statbuf;
if (stat(fname, &statbuf) != -1)
{
*p = statbuf.st_mode;
retval = true;
} // if
return retval;
} // MojoPlatform_perms
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uint16 MojoPlatform_defaultFilePerms(void)
{
return 0644;
} // MojoPlatform_defaultFilePerms
uint16 MojoPlatform_defaultDirPerms(void)
{
return 0755;
} // MojoPlatform_defaultDirPerms
uint16 MojoPlatform_makePermissions(const char *str, boolean *_valid)
{
uint16 retval = 0644;
boolean valid = true;
if (str != NULL)
{
char *endptr = NULL;
long strval = strtol(str, &endptr, 8);
// complete string was a valid number?
valid = ((*endptr == '\0') && (strval >= 0) && (strval <= 0xFFFF));
if (valid)
retval = (uint16) strval;
} // if
*_valid = valid;
return retval;
} // MojoPlatform_makePermissions
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boolean MojoPlatform_chmod(const char *fname, uint16 p)
{
return (chmod(fname, p) != -1);
} // MojoPlatform_chmod
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char *MojoPlatform_findMedia(const char *uniquefile)
{
#if MOJOSETUP_HAVE_SYS_UCRED_H
int i = 0;
struct statfs *mntbufp = NULL;
int mounts = getmntinfo(&mntbufp, MNT_WAIT);
for (i = 0; i < mounts; i++)
{
const char *mnt = mntbufp[i].f_mntonname;
if (MojoPlatform_exists(mnt, uniquefile))
return xstrdup(mnt);
} // for
#elif MOJOSETUP_HAVE_MNTENT_H
FILE *mounts = setmntent("/etc/mtab", "r");
if (mounts != NULL)
{
struct mntent *ent = NULL;
while ((ent = getmntent(mounts)) != NULL)
{
const char *mnt = ent->mnt_dir;
if (MojoPlatform_exists(mnt, uniquefile))
{
endmntent(mounts);
return xstrdup(mnt);
} // if
} // while
endmntent(mounts);
} // if
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#elif MOJOSETUP_HAVE_SYS_MNTTAB_H
FILE *mounts = fopen(MNTTAB, "r");
if (mounts != NULL)
{
struct mnttab ent;
while (getmntent(mounts, &ent) == 0)
{
const char *mnt = ent.mnt_mountp;
if (MojoPlatform_exists(mnt, uniquefile))
{
fclose(mounts);
return xstrdup(mnt);
} // if
} // while
fclose(mounts);
} // if
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#else
# warning No mountpoint detection on this platform...
#endif
return NULL;
} // MojoPlatform_findMedia
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void MojoPlatform_log(const char *str)
{
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syslog(LOG_USER | LOG_INFO, "%s", str);
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#if PLATFORM_MACOSX
// put to stdout too, if this isn't the stdio UI.
// This will let the info show up in /Applications/Utilities/Console.app
if ((GGui != NULL) && (strcmp(GGui->name(), "stdio") != 0))
printf("%s\n", str);
#endif
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} // MojoPlatform_log
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static boolean testTmpDir(const char *dname, char *buf,
size_t len, const char *tmpl)
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{
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boolean retval = false;
if ( (dname != NULL) && (access(dname, R_OK | W_OK | X_OK) == 0) )
{
struct stat statbuf;
if ( (stat(dname, &statbuf) == 0) && (S_ISDIR(statbuf.st_mode)) )
{
const size_t rc = snprintf(buf, len, "%s/%s", dname, tmpl);
if (rc < len)
retval = true;
} // if
} // if
return retval;
} // testTmpDir
void *MojoPlatform_dlopen(const uint8 *img, size_t len)
{
// Write the image to a temporary file, dlopen() it, and delete it
// immediately. The inode will be kept around by the Unix kernel until
// we either dlclose() it or the process terminates, but we don't have
// to worry about polluting the /tmp directory or cleaning this up later.
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// We'll try every reasonable temp directory location until we find one
// that works, in case (say) one lets us write a file, but there
// isn't enough space for the data.
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// /dev/shm may be able to avoid writing to physical media...try it first.
const char *dirs[] = { "/dev/shm", getenv("TMPDIR"), P_tmpdir, "/tmp" };
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const char *tmpl = "mojosetup-plugin-XXXXXX";
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char fname[PATH_MAX];
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void *retval = NULL;
int i = 0;
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#if PLATFORM_MACOSX
if (dlopen == NULL) return NULL; // weak symbol on older Mac OS X
#endif
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#ifndef P_tmpdir // glibc defines this, maybe others.
#define P_tmpdir NULL
#endif
for (i = 0; (i < STATICARRAYLEN(dirs)) && (retval == NULL); i++)
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{
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if (testTmpDir(dirs[i], fname, sizeof (fname), tmpl))
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{
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const int fd = mkstemp(fname);
if (fd != -1)
{
const size_t bw = write(fd, img, len);
const int rc = close(fd);
if ((bw == len) && (rc != -1))
retval = dlopen(fname, DLOPEN_ARGS);
unlink(fname);
} // if
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} // if
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} // for
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return retval;
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} // MojoPlatform_dlopen
void *MojoPlatform_dlsym(void *lib, const char *sym)
{
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#if PLATFORM_MACOSX
if (dlsym == NULL) return NULL; // weak symbol on older Mac OS X
#endif
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return dlsym(lib, sym);
} // MojoPlatform_dlsym
void MojoPlatform_dlclose(void *lib)
{
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#if PLATFORM_MACOSX
if (dlclose == NULL) return; // weak symbol on older Mac OS X
#endif