mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-01-05 18:49:06 +00:00
6ad21447f8
ExecveHandler.c: * Use "" instead of <> for LLVM include files * Use raw I/O, we don't need buffering * Set errno = 0 before using open() * strlen() doesn't count NULL terminator in its size * Use memcmp() instead of strcmp() * Return result of the real execve(), not 0 * Search for path to bytecode file if not absolute/relative path SysUtils.c: * Convert all comments to C-style * Stop using `bool', use `unsigned' instead SysUtils.h: * Stop using `bool', use `unsigned' instead * Updated comment to FindExecutable() README.txt: * Describe the goal of LLEE and an application llvm-svn: 7911
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
//===- SystemUtils.h - Utilities to do low-level system stuff --*- C++ -*--===//
|
|
//
|
|
// This file contains functions used to do a variety of low-level, often
|
|
// system-specific, tasks.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "SysUtils.h"
|
|
#include "Config/sys/types.h"
|
|
#include "Config/sys/stat.h"
|
|
#include "Config/fcntl.h"
|
|
#include "Config/sys/wait.h"
|
|
#include "Config/unistd.h"
|
|
#include "Config/errno.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* isExecutableFile - This function returns true if the filename specified
|
|
* exists and is executable.
|
|
*/
|
|
unsigned isExecutableFile(const char *ExeFileName) {
|
|
struct stat Buf;
|
|
if (stat(ExeFileName, &Buf))
|
|
return 0; // Must not be executable!
|
|
|
|
if (!(Buf.st_mode & S_IFREG))
|
|
return 0; // Not a regular file?
|
|
|
|
if (Buf.st_uid == getuid()) // Owner of file?
|
|
return Buf.st_mode & S_IXUSR;
|
|
else if (Buf.st_gid == getgid()) // In group of file?
|
|
return Buf.st_mode & S_IXGRP;
|
|
else // Unrelated to file?
|
|
return Buf.st_mode & S_IXOTH;
|
|
}
|
|
|
|
/*
|
|
* FindExecutable - Find a named executable in the directories listed in $PATH.
|
|
* If the executable cannot be found, returns NULL.
|
|
*/
|
|
char *FindExecutable(const char *ExeName) {
|
|
/* Try to find the executable in the path */
|
|
const char *PathStr = getenv("PATH");
|
|
if (PathStr == 0) return "";
|
|
|
|
/* Now we have a colon separated list of directories to search, try them. */
|
|
unsigned PathLen = strlen(PathStr);
|
|
while (PathLen) {
|
|
/* Find the next colon */
|
|
const char *Colon = strchr(PathStr, ':');
|
|
|
|
/* Check to see if this first directory contains the executable... */
|
|
unsigned DirLen = Colon ? (Colon-PathStr) : strlen(PathStr);
|
|
char *FilePath = alloca(sizeof(char) * (DirLen+1+strlen(ExeName)+1));
|
|
unsigned i, e;
|
|
for (i = 0; i != DirLen; ++i)
|
|
FilePath[i] = PathStr[i];
|
|
FilePath[i] = '/';
|
|
for (i = 0, e = strlen(ExeName); i != e; ++i)
|
|
FilePath[DirLen + 1 + i] = ExeName[i];
|
|
FilePath[DirLen + 1 + i] = '\0';
|
|
if (isExecutableFile(FilePath))
|
|
return strdup(FilePath); /* Found the executable! */
|
|
|
|
/* If Colon is NULL, there are no more colon separators and no more dirs */
|
|
if (!Colon) break;
|
|
|
|
/* Nope, it wasn't in this directory, check the next range! */
|
|
PathLen -= DirLen;
|
|
PathStr = Colon;
|
|
while (*PathStr == ':') { /* Advance past colons */
|
|
PathStr++;
|
|
PathLen--;
|
|
}
|
|
|
|
/* Advance past the colon */
|
|
++Colon;
|
|
}
|
|
|
|
/* If we fell out, we ran out of directories to search, return failure. */
|
|
return NULL;
|
|
}
|