diff options
Diffstat (limited to 'lldb/tools/debugserver/source/PseudoTerminal.cpp')
| -rw-r--r-- | lldb/tools/debugserver/source/PseudoTerminal.cpp | 199 |
1 files changed, 84 insertions, 115 deletions
diff --git a/lldb/tools/debugserver/source/PseudoTerminal.cpp b/lldb/tools/debugserver/source/PseudoTerminal.cpp index f1b505cabd4..616aec989c8 100644 --- a/lldb/tools/debugserver/source/PseudoTerminal.cpp +++ b/lldb/tools/debugserver/source/PseudoTerminal.cpp @@ -19,11 +19,8 @@ //---------------------------------------------------------------------- // PseudoTerminal constructor //---------------------------------------------------------------------- -PseudoTerminal::PseudoTerminal() : - m_master_fd(invalid_fd), - m_slave_fd(invalid_fd) -{ -} +PseudoTerminal::PseudoTerminal() + : m_master_fd(invalid_fd), m_slave_fd(invalid_fd) {} //---------------------------------------------------------------------- // Destructor @@ -32,36 +29,29 @@ PseudoTerminal::PseudoTerminal() : // to release any file descriptors that are needed beyond the lifespan // of this object. //---------------------------------------------------------------------- -PseudoTerminal::~PseudoTerminal() -{ - CloseMaster(); - CloseSlave(); +PseudoTerminal::~PseudoTerminal() { + CloseMaster(); + CloseSlave(); } //---------------------------------------------------------------------- // Close the master file descriptor if it is valid. //---------------------------------------------------------------------- -void -PseudoTerminal::CloseMaster() -{ - if (m_master_fd > 0) - { - ::close (m_master_fd); - m_master_fd = invalid_fd; - } +void PseudoTerminal::CloseMaster() { + if (m_master_fd > 0) { + ::close(m_master_fd); + m_master_fd = invalid_fd; + } } //---------------------------------------------------------------------- // Close the slave file descriptor if it is valid. //---------------------------------------------------------------------- -void -PseudoTerminal::CloseSlave() -{ - if (m_slave_fd > 0) - { - ::close (m_slave_fd); - m_slave_fd = invalid_fd; - } +void PseudoTerminal::CloseSlave() { + if (m_slave_fd > 0) { + ::close(m_slave_fd); + m_slave_fd = invalid_fd; + } } //---------------------------------------------------------------------- @@ -75,31 +65,26 @@ PseudoTerminal::CloseSlave() // RETURNS: // Zero when successful, non-zero indicating an error occurred. //---------------------------------------------------------------------- -PseudoTerminal::Error -PseudoTerminal::OpenFirstAvailableMaster(int oflag) -{ - // Open the master side of a pseudo terminal - m_master_fd = ::posix_openpt (oflag); - if (m_master_fd < 0) - { - return err_posix_openpt_failed; - } +PseudoTerminal::Error PseudoTerminal::OpenFirstAvailableMaster(int oflag) { + // Open the master side of a pseudo terminal + m_master_fd = ::posix_openpt(oflag); + if (m_master_fd < 0) { + return err_posix_openpt_failed; + } - // Grant access to the slave pseudo terminal - if (::grantpt (m_master_fd) < 0) - { - CloseMaster(); - return err_grantpt_failed; - } + // Grant access to the slave pseudo terminal + if (::grantpt(m_master_fd) < 0) { + CloseMaster(); + return err_grantpt_failed; + } - // Clear the lock flag on the slave pseudo terminal - if (::unlockpt (m_master_fd) < 0) - { - CloseMaster(); - return err_unlockpt_failed; - } + // Clear the lock flag on the slave pseudo terminal + if (::unlockpt(m_master_fd) < 0) { + CloseMaster(); + return err_unlockpt_failed; + } - return success; + return success; } //---------------------------------------------------------------------- @@ -112,27 +97,23 @@ PseudoTerminal::OpenFirstAvailableMaster(int oflag) // RETURNS: // Zero when successful, non-zero indicating an error occurred. //---------------------------------------------------------------------- -PseudoTerminal::Error -PseudoTerminal::OpenSlave(int oflag) -{ - CloseSlave(); +PseudoTerminal::Error PseudoTerminal::OpenSlave(int oflag) { + CloseSlave(); - // Open the master side of a pseudo terminal - const char *slave_name = SlaveName(); + // Open the master side of a pseudo terminal + const char *slave_name = SlaveName(); - if (slave_name == NULL) - return err_ptsname_failed; + if (slave_name == NULL) + return err_ptsname_failed; - m_slave_fd = ::open (slave_name, oflag); + m_slave_fd = ::open(slave_name, oflag); - if (m_slave_fd < 0) - return err_open_slave_failed; + if (m_slave_fd < 0) + return err_open_slave_failed; - return success; + return success; } - - //---------------------------------------------------------------------- // Get the name of the slave pseudo terminal. A master pseudo terminal // should already be valid prior to calling this function (see @@ -144,15 +125,12 @@ PseudoTerminal::OpenSlave(int oflag) // that comes from static memory, so a copy of the string should be // made as subsequent calls can change this value. //---------------------------------------------------------------------- -const char* -PseudoTerminal::SlaveName() const -{ - if (m_master_fd < 0) - return NULL; - return ::ptsname (m_master_fd); +const char *PseudoTerminal::SlaveName() const { + if (m_master_fd < 0) + return NULL; + return ::ptsname(m_master_fd); } - //---------------------------------------------------------------------- // Fork a child process that and have its stdio routed to a pseudo // terminal. @@ -175,53 +153,44 @@ PseudoTerminal::SlaveName() const // in the child process: zero //---------------------------------------------------------------------- -pid_t -PseudoTerminal::Fork(PseudoTerminal::Error& error) -{ - pid_t pid = invalid_pid; - error = OpenFirstAvailableMaster (O_RDWR|O_NOCTTY); - - if (error == 0) - { - // Successfully opened our master pseudo terminal - - pid = ::fork (); - if (pid < 0) - { - // Fork failed - error = err_fork_failed; - } - else if (pid == 0) - { - // Child Process - ::setsid(); - - error = OpenSlave (O_RDWR); - if (error == 0) - { - // Successfully opened slave - // We are done with the master in the child process so lets close it - CloseMaster (); - -#if defined (TIOCSCTTY) - // Acquire the controlling terminal - if (::ioctl (m_slave_fd, TIOCSCTTY, (char *)0) < 0) - error = err_failed_to_acquire_controlling_terminal; +pid_t PseudoTerminal::Fork(PseudoTerminal::Error &error) { + pid_t pid = invalid_pid; + error = OpenFirstAvailableMaster(O_RDWR | O_NOCTTY); + + if (error == 0) { + // Successfully opened our master pseudo terminal + + pid = ::fork(); + if (pid < 0) { + // Fork failed + error = err_fork_failed; + } else if (pid == 0) { + // Child Process + ::setsid(); + + error = OpenSlave(O_RDWR); + if (error == 0) { + // Successfully opened slave + // We are done with the master in the child process so lets close it + CloseMaster(); + +#if defined(TIOCSCTTY) + // Acquire the controlling terminal + if (::ioctl(m_slave_fd, TIOCSCTTY, (char *)0) < 0) + error = err_failed_to_acquire_controlling_terminal; #endif - // Duplicate all stdio file descriptors to the slave pseudo terminal - if (::dup2 (m_slave_fd, STDIN_FILENO) != STDIN_FILENO) - error = error ? error : err_dup2_failed_on_stdin; - if (::dup2 (m_slave_fd, STDOUT_FILENO) != STDOUT_FILENO) - error = error ? error : err_dup2_failed_on_stdout; - if (::dup2 (m_slave_fd, STDERR_FILENO) != STDERR_FILENO) - error = error ? error : err_dup2_failed_on_stderr; - } - } - else - { - // Parent Process - // Do nothing and let the pid get returned! - } + // Duplicate all stdio file descriptors to the slave pseudo terminal + if (::dup2(m_slave_fd, STDIN_FILENO) != STDIN_FILENO) + error = error ? error : err_dup2_failed_on_stdin; + if (::dup2(m_slave_fd, STDOUT_FILENO) != STDOUT_FILENO) + error = error ? error : err_dup2_failed_on_stdout; + if (::dup2(m_slave_fd, STDERR_FILENO) != STDERR_FILENO) + error = error ? error : err_dup2_failed_on_stderr; + } + } else { + // Parent Process + // Do nothing and let the pid get returned! } - return pid; + } + return pid; } |
