#include "Support/FileUtilities.h"
#include "Config/unistd.h"
+#include "Config/sys/stat.h"
+#include "Config/sys/types.h"
#include <fstream>
#include <iostream>
#include <cstdio>
exit(1);
}
- // We don't need to hold the temp file descriptor... we will trust that noone
+ // We don't need to hold the temp file descriptor... we will trust that no one
// will overwrite/delete the file while we are working on it...
close(TempFD);
std::string Result(FNBuffer);
delete[] FNBuffer;
return Result;
}
+
+///
+/// Method: MakeFileExecutable ()
+///
+/// Description:
+/// This method makes the specified filename executable by giving it
+/// execute permission. It respects the umask value of the process, and it
+/// does not enable any unnecessary access bits.
+///
+/// Algorithm:
+/// o Get file's current permissions.
+/// o Get the process's current umask.
+/// o Take the set of all execute bits and disable those found in the umask.
+/// o Add the remaining permissions to the file's permissions.
+///
+bool
+MakeFileExecutable (const std::string & Filename)
+{
+ // Permissions masking value of the user
+ mode_t mask;
+
+ // Permissions currently enabled on the file
+ struct stat fstat;
+
+ //
+ // Grab the umask value from the operating system. We want to use it when
+ // changing the file's permissions.
+ //
+ // Note:
+ // Umask() is one of those annoying system calls. You have to call it
+ // to get the current value and then set it back.
+ //
+ mask = umask (0x777);
+ umask (mask);
+
+ //
+ // Go fetch the file's current permission bits. We want to *add* execute
+ // access to the file.
+ //
+ if ((stat (Filename.c_str(), &fstat)) == -1)
+ {
+ return false;
+ }
+
+ //
+ // Make the file executable...
+ //
+ if ((chmod(Filename.c_str(), (fstat.st_mode | (0111 & ~mask)))) == -1)
+ {
+ return false;
+ }
+
+ return true;
+}
+
+///
+/// Method: MakeFileReadable ()
+///
+/// Description:
+/// This method makes the specified filename readable by giving it
+/// read permission. It respects the umask value of the process, and it
+/// does not enable any unnecessary access bits.
+///
+/// Algorithm:
+/// o Get file's current permissions.
+/// o Get the process's current umask.
+/// o Take the set of all read bits and disable those found in the umask.
+/// o Add the remaining permissions to the file's permissions.
+///
+bool
+MakeFileReadable (const std::string & Filename)
+{
+ // Permissions masking value of the user
+ mode_t mask;
+
+ // Permissions currently enabled on the file
+ struct stat fstat;
+
+ //
+ // Grab the umask value from the operating system. We want to use it when
+ // changing the file's permissions.
+ //
+ // Note:
+ // Umask() is one of those annoying system calls. You have to call it
+ // to get the current value and then set it back.
+ //
+ mask = umask (0x777);
+ umask (mask);
+
+ //
+ // Go fetch the file's current permission bits. We want to *add* execute
+ // access to the file.
+ //
+ if ((stat (Filename.c_str(), &fstat)) == -1)
+ {
+ return false;
+ }
+
+ //
+ // Make the file executable...
+ //
+ if ((chmod(Filename.c_str(), (fstat.st_mode | (0444 & ~mask)))) == -1)
+ {
+ return false;
+ }
+
+ return true;
+}
+