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593ece0050
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7911 91177308-0d34-0410-b5e6-96231b3b80d8
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
//===- SystemUtils.h - Utilities to do low-level system stuff --*- C++ -*--===//
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//
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// This file contains functions used to do a variety of low-level, often
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// system-specific, tasks.
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//
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//===----------------------------------------------------------------------===//
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#include "SysUtils.h"
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#include "Config/sys/types.h"
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#include "Config/sys/stat.h"
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#include "Config/fcntl.h"
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#include "Config/sys/wait.h"
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#include "Config/unistd.h"
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#include "Config/errno.h"
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#include <stdlib.h>
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#include <string.h>
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/*
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* isExecutableFile - This function returns true if the filename specified
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* exists and is executable.
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*/
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unsigned isExecutableFile(const char *ExeFileName) {
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struct stat Buf;
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if (stat(ExeFileName, &Buf))
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return 0; // Must not be executable!
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if (!(Buf.st_mode & S_IFREG))
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return 0; // Not a regular file?
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if (Buf.st_uid == getuid()) // Owner of file?
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return Buf.st_mode & S_IXUSR;
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else if (Buf.st_gid == getgid()) // In group of file?
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return Buf.st_mode & S_IXGRP;
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else // Unrelated to file?
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return Buf.st_mode & S_IXOTH;
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}
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/*
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* FindExecutable - Find a named executable in the directories listed in $PATH.
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* If the executable cannot be found, returns NULL.
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*/
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char *FindExecutable(const char *ExeName) {
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/* Try to find the executable in the path */
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const char *PathStr = getenv("PATH");
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if (PathStr == 0) return "";
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/* Now we have a colon separated list of directories to search, try them. */
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unsigned PathLen = strlen(PathStr);
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while (PathLen) {
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/* Find the next colon */
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const char *Colon = strchr(PathStr, ':');
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/* Check to see if this first directory contains the executable... */
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unsigned DirLen = Colon ? (Colon-PathStr) : strlen(PathStr);
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char *FilePath = alloca(sizeof(char) * (DirLen+1+strlen(ExeName)+1));
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unsigned i, e;
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for (i = 0; i != DirLen; ++i)
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FilePath[i] = PathStr[i];
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FilePath[i] = '/';
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for (i = 0, e = strlen(ExeName); i != e; ++i)
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FilePath[DirLen + 1 + i] = ExeName[i];
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FilePath[DirLen + 1 + i] = '\0';
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if (isExecutableFile(FilePath))
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return strdup(FilePath); /* Found the executable! */
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/* If Colon is NULL, there are no more colon separators and no more dirs */
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if (!Colon) break;
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/* Nope, it wasn't in this directory, check the next range! */
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PathLen -= DirLen;
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PathStr = Colon;
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while (*PathStr == ':') { /* Advance past colons */
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PathStr++;
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PathLen--;
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}
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/* Advance past the colon */
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++Colon;
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}
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/* If we fell out, we ran out of directories to search, return failure. */
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return NULL;
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}
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