[io] Replace hardcoded 0644 permissions with 0666 to respect umask

This change allows the system umask to control file permissions
instead of hardcoding them to 0644. Files will now be created with
permissions determined by (0666 & ~umask), which is the standard
Unix behavior.

Files modified:
- io/io/src/TFile.cxx
- io/io/src/TMapFile.cxx
- io/io/src/TMemFile.cxx
- io/dcache/src/TDCacheFile.cxx
- net/net/src/TFTP.cxx
- net/net/src/TApplicationServer.cxx

Fixes #17095

Author: Ahmed Bilal

io/dcache/src/TDCacheFile.cxx

@@ -140,7 +140,7 @@ TDCacheFile::TDCacheFile(const char *path, Option_t *option,
 
    if (create || update) {
 #ifndef WIN32
-      fD = SysOpen(fname, O_RDWR | O_CREAT, 0644);
+      fD = SysOpen(fname, O_RDWR | O_CREAT, 0666);
 #else
       fD = SysOpen(fname, O_RDWR | O_CREAT | O_BINARY, S_IREAD | S_IWRITE);
 #endif
@@ -151,7 +151,7 @@ TDCacheFile::TDCacheFile(const char *path, Option_t *option,
       fWritable = kTRUE;
    } else {
 #ifndef WIN32
-      fD = SysOpen(fname, O_RDONLY, 0644);
+      fD = SysOpen(fname, O_RDONLY, 0666);
 #else
       fD = SysOpen(fname, O_RDONLY | O_BINARY, S_IREAD | S_IWRITE);
 #endif

io/io/src/TFile.cxx

@@ -533,7 +533,7 @@ TFile::TFile(const char *fname1, Option_t *option, const char *ftitle, Int_t com
    // Connect to file system stream
    if (create || update) {
 #ifndef WIN32
-      fD = TFile::SysOpen(fname.Data(), O_RDWR | O_CREAT, 0644);
+      fD = TFile::SysOpen(fname.Data(), O_RDWR | O_CREAT, 0666);
 #else
       fD = TFile::SysOpen(fname.Data(), O_RDWR | O_CREAT | O_BINARY, S_IREAD | S_IWRITE);
 #endif
@@ -545,7 +545,7 @@ TFile::TFile(const char *fname1, Option_t *option, const char *ftitle, Int_t com
       fWritable = kTRUE;
    } else {
 #ifndef WIN32
-      fD = TFile::SysOpen(fname.Data(), O_RDONLY, 0644);
+      fD = TFile::SysOpen(fname.Data(), O_RDONLY, 0666);
 #else
       fD = TFile::SysOpen(fname.Data(), O_RDONLY | O_BINARY, S_IREAD | S_IWRITE);
 #endif
@@ -2236,7 +2236,7 @@ Int_t TFile::ReOpen(Option_t *mode)
       // open in READ mode
       fOption = opt;    // set fOption before SysOpen() for TNetFile
 #ifndef WIN32
-      fD = SysOpen(fRealName, O_RDONLY, 0644);
+      fD = SysOpen(fRealName, O_RDONLY, 0666);
 #else
       fD = SysOpen(fRealName, O_RDONLY | O_BINARY, S_IREAD | S_IWRITE);
 #endif
@@ -2258,7 +2258,7 @@ Int_t TFile::ReOpen(Option_t *mode)
       // open in UPDATE mode
       fOption = opt;    // set fOption before SysOpen() for TNetFile
 #ifndef WIN32
-      fD = SysOpen(fRealName, O_RDWR | O_CREAT, 0644);
+      fD = SysOpen(fRealName, O_RDWR | O_CREAT, 0666);
 #else
       fD = SysOpen(fRealName, O_RDWR | O_CREAT | O_BINARY, S_IREAD | S_IWRITE);
 #endif

io/io/src/TMapFile.cxx

@@ -333,7 +333,7 @@ TMapFile::TMapFile(const char *name, const char *title, Option_t *option,
    // Open file to which memory will be mapped
    if (create || update) {
 #ifndef WIN32
-      fFd = open(fname, O_RDWR | O_CREAT, 0644);
+      fFd = open(fname, O_RDWR | O_CREAT, 0666);
 #else
       fFd = (Longptr_t) CreateFile(fname,                    // pointer to name of the file
                      GENERIC_WRITE | GENERIC_READ,       // access (read-write) mode

io/io/src/TMemFile.cxx

@@ -179,15 +179,15 @@ TMemFile::TMemFile(const char *path, char *buffer, Long64_t size, Option_t *opti
       Int_t mode = O_RDWR | O_CREAT;
       if (optmode == EMode::kRecreate) mode |= O_TRUNC;
 
-      fD = TMemFile::SysOpen(path, mode, 0644);
+      fD = TMemFile::SysOpen(path, mode, 0666);
       if (fD == -1) {
          SysError("TMemFile", "file %s can not be opened", path);
          goto zombie;
       }
       fWritable = kTRUE;
 
    } else {
-      fD = TMemFile::SysOpen(path, O_RDONLY, 0644);
+      fD = TMemFile::SysOpen(path, O_RDONLY, 0666);
       if (fD == -1) {
          SysError("TMemFile", "file %s can not be opened for reading", path);
          goto zombie;

net/net/src/TApplicationServer.cxx

@@ -788,7 +788,7 @@ Int_t TApplicationServer::ReceiveFile(const char *file, Bool_t bin, Long64_t siz
 
    close(fd);
 
-   chmod(file, 0644);
+   chmod(file, 0666);
 
    return 0;
 }

net/net/src/TFTP.cxx

@@ -593,7 +593,7 @@ Long64_t TFTP::GetFile(const char *file, const char *localName)
    delete [] buf; delete [] buf2;
 
 #ifndef R__WIN32
-   fchmod(fd, 0644);
+   fchmod(fd, 0666);
 #endif
 
    close(fd);