forked from enlightenment/enlightenment
404 lines
8.2 KiB
C
404 lines
8.2 KiB
C
#include "config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dlfcn.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/utsname.h>
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#include <fcntl.h>
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#ifdef HAVE_ALLOCA_H
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#include <alloca.h>
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#endif
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static void env_set(const char *var, const char *val);
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static int prefix_determine(char *argv0);
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static void
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env_set(const char *var, const char *val)
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{
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if (val)
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{
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#ifdef HAVE_SETENV
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setenv(var, val, 1);
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#else
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char *buf;
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buf = alloca(strlen(var) + 1 + strlen(val) + 1);
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snprintf(buf, sizeof(buf), "%s=%s", var, val);
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if (getenv(var))
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putenv(buf);
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else
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putenv(strdup(buf));
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#endif
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}
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else
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{
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#ifdef HAVE_UNSETENV
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unsetenv(var);
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#else
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if (getenv(var)) putenv(var);
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#endif
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}
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}
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/* local subsystem functions */
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static int _prefix_fallbacks(void);
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static int _prefix_try_proc(void);
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static int _prefix_try_argv(char *argv0);
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/* local subsystem globals */
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static char *_exe_path = NULL;
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static char *_prefix_path = NULL;
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/* externally accessible functions */
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static int
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prefix_determine(char *argv0)
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{
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char *p;
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if (!_prefix_try_proc())
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{
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if (!_prefix_try_argv(argv0))
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{
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_prefix_fallbacks();
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return 0;
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}
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}
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/* _exe_path is now a full absolute path TO this exe - figure out rest */
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/* if
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* exe = /blah/whatever/bin/exe
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* then
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* prefix = /blah/whatever
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*/
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p = strrchr(_exe_path, '/');
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if (p)
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{
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p--;
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while (p >= _exe_path)
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{
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if (*p == '/')
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{
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_prefix_path = malloc(p - _exe_path + 1);
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if (_prefix_path)
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{
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strncpy(_prefix_path, _exe_path, p - _exe_path);
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_prefix_path[p - _exe_path] = 0;
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return 1;
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}
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else
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{
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free(_exe_path);
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_exe_path = NULL;
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_prefix_fallbacks();
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return 0;
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}
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}
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p--;
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}
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}
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free(_exe_path);
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_exe_path = NULL;
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_prefix_fallbacks();
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return 0;
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}
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static int
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_prefix_fallbacks(void)
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{
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char *p;
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_prefix_path = strdup(PACKAGE_BIN_DIR);
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p = strrchr(_prefix_path, '/');
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if (p) *p = 0;
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printf("WARNING: Enlightenment could not determine its installed prefix\n"
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" and is falling back on the compiled in default:\n"
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" %s\n", _prefix_path);
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return 1;
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}
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static int
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_prefix_try_proc(void)
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{
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FILE *f;
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char buf[4096];
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void *func = NULL;
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func = (void *)_prefix_try_proc;
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f = fopen("/proc/self/maps", "r");
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if (!f) return 0;
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while (fgets(buf, sizeof(buf), f))
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{
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int len;
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char *p, mode[5] = "";
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unsigned long ptr1 = 0, ptr2 = 0;
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len = strlen(buf);
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if (buf[len - 1] == '\n')
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{
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buf[len - 1] = 0;
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len--;
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}
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if (sscanf(buf, "%lx-%lx %4s", &ptr1, &ptr2, mode) == 3)
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{
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if (!strcmp(mode, "r-xp"))
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{
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if (((void *)ptr1 <= func) && (func < (void *)ptr2))
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{
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p = strchr(buf, '/');
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if (p)
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{
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if (len > 10)
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{
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if (!strcmp(buf + len - 10, " (deleted)"))
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buf[len - 10] = 0;
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}
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_exe_path = strdup(p);
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fclose(f);
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return 1;
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}
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else
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break;
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}
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}
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}
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}
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fclose(f);
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return 0;
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}
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static int
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_prefix_try_argv(char *argv0)
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{
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char *path, *p, *cp, *s;
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int len, lenexe;
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#ifdef PATH_MAX
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char buf[PATH_MAX], buf2[PATH_MAX], buf3[PATH_MAX];
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#else
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char buf[4096], buf2[4096], buf3[4096];
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#endif
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/* 1. is argv0 abs path? */
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if (argv0[0] == '/')
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{
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_exe_path = strdup(argv0);
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if (access(_exe_path, X_OK) == 0) return 1;
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free(_exe_path);
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_exe_path = NULL;
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return 0;
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}
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/* 2. relative path */
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if (strchr(argv0, '/'))
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{
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if (getcwd(buf3, sizeof(buf3)))
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{
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snprintf(buf2, sizeof(buf2), "%s/%s", buf3, argv0);
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if (realpath(buf2, buf))
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{
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_exe_path = strdup(buf);
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if (access(_exe_path, X_OK) == 0) return 1;
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free(_exe_path);
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_exe_path = NULL;
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}
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}
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}
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/* 3. argv0 no path - look in PATH */
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path = getenv("PATH");
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if (!path) return 0;
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p = path;
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cp = p;
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lenexe = strlen(argv0);
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while ((p = strchr(cp, ':')))
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{
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len = p - cp;
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s = malloc(len + 1 + lenexe + 1);
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if (s)
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{
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strncpy(s, cp, len);
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s[len] = '/';
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strcpy(s + len + 1, argv0);
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if (realpath(s, buf))
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{
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if (access(buf, X_OK) == 0)
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{
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_exe_path = strdup(buf);
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free(s);
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return 1;
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}
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}
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free(s);
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}
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cp = p + 1;
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}
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len = strlen(cp);
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s = malloc(len + 1 + lenexe + 1);
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if (s)
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{
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strncpy(s, cp, len);
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s[len] = '/';
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strcpy(s + len + 1, argv0);
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if (realpath(s, buf))
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{
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if (access(buf, X_OK) == 0)
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{
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_exe_path = strdup(buf);
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free(s);
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return 1;
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}
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}
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free(s);
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}
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/* 4. big problems. arg[0] != executable - weird execution */
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return 0;
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}
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static void
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precache(void)
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{
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FILE *f;
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char *home;
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char buf[4096], tbuf[256 * 1024];
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struct stat st;
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int l, fd, children = 0, cret;
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home = getenv("HOME");
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if (home) snprintf(buf, sizeof(buf), "%s/.e-precache", home);
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else snprintf(buf, sizeof(buf), "/tmp/.e-precache");
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f = fopen(buf, "r");
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if (!f) return;
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unlink(buf);
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if (fork()) return;
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// while (fgets(buf, sizeof(buf), f));
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// rewind(f);
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while (fgets(buf, sizeof(buf), f))
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{
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l = strlen(buf);
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if (l > 0) buf[l - 1] = 0;
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if (!fork())
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{
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if (buf[0] == 's')
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{
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stat(buf + 2, &st);
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}
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else if (buf[0] == 'o')
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{
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fd = open(buf + 2, O_RDONLY);
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if (fd >= 0)
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{
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while (read(fd, tbuf, 256 * 1024) > 0);
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close(fd);
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}
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}
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else if (buf[0] == 'd')
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{
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fd = open(buf + 2, O_RDONLY);
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if (fd >= 0)
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{
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while (read(fd, tbuf, 256 * 1024) > 0);
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close(fd);
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}
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}
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exit(0);
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}
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children++;
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if (children > 400)
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{
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wait(&cret);
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children--;
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}
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}
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fclose(f);
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while (children > 0)
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{
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wait(&cret);
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children--;
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}
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exit(0);
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}
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int
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main(int argc, char **argv)
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{
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int i, do_precache = 0;
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char buf[16384], **args, *p;
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prefix_determine(argv[0]);
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env_set("E_START", argv[0]);
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p = getenv("PATH");
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if (p) snprintf(buf, sizeof(buf), "%s/bin:%s", _prefix_path, p);
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else snprintf(buf, sizeof(buf), "%s/bin", _prefix_path);
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env_set("PATH", buf);
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p = getenv("LD_LIBRARY_PATH");
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if (p) snprintf(buf, sizeof(buf), "%s/lib:%s", _prefix_path, p);
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else snprintf(buf, sizeof(buf), "%s/lib", _prefix_path);
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env_set("LD_LIBRARY_PATH", buf);
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for (i = 1; i < argc; i++)
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{
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if (!strcmp(argv[i], "-no-precache")) do_precache = 0;
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else if ((!strcmp(argv[i], "-h")) ||
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(!strcmp(argv[i], "-help")) ||
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(!strcmp(argv[i], "--help")))
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{
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printf
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("Options:\n"
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"\t-no-precache\n"
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"\t\tDisable pre-caching of files\n"
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"\n"
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"Please run:\n"
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"\tenlightenment %s\n"
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"for more options.\n",
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argv[i]
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);
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exit(0);
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}
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}
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printf("E - PID=%i, do_precache=%i\n", getpid(), do_precache);
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if (do_precache)
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{
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void *lib, *func;
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do_precache = 0;
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/* sanity checks - if precache might fail - check here first */
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lib = dlopen("libevas.so", RTLD_GLOBAL | RTLD_LAZY);
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if (!lib) dlopen("libevas.so.1", RTLD_GLOBAL | RTLD_LAZY);
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if (!lib) goto done;
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func = dlsym(lib, "evas_init");
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if (!func) goto done;
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lib = dlopen("libecore_file.so", RTLD_GLOBAL | RTLD_LAZY);
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if (!lib) dlopen("libecore_file.so.1", RTLD_GLOBAL | RTLD_LAZY);
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if (!lib) goto done;
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func = dlsym(lib, "ecore_file_init");
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if (!func) goto done;
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lib = dlopen("libeet.so", RTLD_GLOBAL | RTLD_LAZY);
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if (!lib) dlopen("libeet.so.0", RTLD_GLOBAL | RTLD_LAZY);
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if (!lib) goto done;
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func = dlsym(lib, "eet_init");
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if (!func) goto done;
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/* precache SHOULD work */
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snprintf(buf, sizeof(buf), "%s/lib/enlightenment/preload/e_precache.so", _prefix_path);
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env_set("LD_PRELOAD", buf);
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printf("E - PRECACHE GOING NOW...\n");
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fflush(stdout);
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precache();
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}
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done:
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args = alloca((argc + 1) * sizeof(char *));
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args[0] = "enlightenment";
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for (i = 1; i < argc; i++) args[i] = argv[i];
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args[i] = NULL;
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snprintf(buf, sizeof(buf), "%s/bin/enlightenment", _prefix_path);
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execv(buf, args);
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printf("FAILED TO RUN:\n");
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printf(" %s\n", buf);
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perror("execv");
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return -1;
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}
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