diff options
Diffstat (limited to 'lldb/source/Utility/PseudoTerminal.cpp')
| -rw-r--r-- | lldb/source/Utility/PseudoTerminal.cpp | 322 |
1 files changed, 138 insertions, 184 deletions
diff --git a/lldb/source/Utility/PseudoTerminal.cpp b/lldb/source/Utility/PseudoTerminal.cpp index 7a200f2a817..555dcf1a01d 100644 --- a/lldb/source/Utility/PseudoTerminal.cpp +++ b/lldb/source/Utility/PseudoTerminal.cpp @@ -7,13 +7,13 @@ // //===----------------------------------------------------------------------===// -#include "lldb/Host/Config.h" #include "lldb/Utility/PseudoTerminal.h" +#include "lldb/Host/Config.h" #include <errno.h> +#include <stdio.h> #include <stdlib.h> #include <string.h> -#include <stdio.h> #if defined(TIOCSCTTY) #include <sys/ioctl.h> #endif @@ -29,11 +29,8 @@ using namespace lldb_utility; //---------------------------------------------------------------------- // 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 @@ -43,40 +40,33 @@ PseudoTerminal::PseudoTerminal () : // ReleaseMasterFileDescriptor() or the ReleaseSaveFileDescriptor() // member functions. //---------------------------------------------------------------------- -PseudoTerminal::~PseudoTerminal () -{ - CloseMasterFileDescriptor(); - CloseSlaveFileDescriptor(); +PseudoTerminal::~PseudoTerminal() { + CloseMasterFileDescriptor(); + CloseSlaveFileDescriptor(); } //---------------------------------------------------------------------- // Close the master file descriptor if it is valid. //---------------------------------------------------------------------- -void -PseudoTerminal::CloseMasterFileDescriptor () -{ - if (m_master_fd >= 0) - { - // Don't call 'close' on m_master_fd for Windows as a dummy implementation of - // posix_openpt above always gives it a 0 value. +void PseudoTerminal::CloseMasterFileDescriptor() { + if (m_master_fd >= 0) { +// Don't call 'close' on m_master_fd for Windows as a dummy implementation of +// posix_openpt above always gives it a 0 value. #ifndef _WIN32 - ::close (m_master_fd); + ::close(m_master_fd); #endif - m_master_fd = invalid_fd; - } + m_master_fd = invalid_fd; + } } //---------------------------------------------------------------------- // Close the slave file descriptor if it is valid. //---------------------------------------------------------------------- -void -PseudoTerminal::CloseSlaveFileDescriptor () -{ - if (m_slave_fd >= 0) - { - ::close (m_slave_fd); - m_slave_fd = invalid_fd; - } +void PseudoTerminal::CloseSlaveFileDescriptor() { + if (m_slave_fd >= 0) { + ::close(m_slave_fd); + m_slave_fd = invalid_fd; + } } //---------------------------------------------------------------------- @@ -93,40 +83,36 @@ PseudoTerminal::CloseSlaveFileDescriptor () // RETURNS: // Zero when successful, non-zero indicating an error occurred. //---------------------------------------------------------------------- -bool -PseudoTerminal::OpenFirstAvailableMaster (int oflag, char *error_str, size_t error_len) -{ +bool PseudoTerminal::OpenFirstAvailableMaster(int oflag, char *error_str, + size_t error_len) { + if (error_str) + error_str[0] = '\0'; + + // Open the master side of a pseudo terminal + m_master_fd = ::posix_openpt(oflag); + if (m_master_fd < 0) { if (error_str) - error_str[0] = '\0'; - - // Open the master side of a pseudo terminal - m_master_fd = ::posix_openpt (oflag); - if (m_master_fd < 0) - { - if (error_str) - ::strerror_r (errno, error_str, error_len); - return false; - } + ::strerror_r(errno, error_str, error_len); + return false; + } - // Grant access to the slave pseudo terminal - if (::grantpt (m_master_fd) < 0) - { - if (error_str) - ::strerror_r (errno, error_str, error_len); - CloseMasterFileDescriptor (); - return false; - } + // Grant access to the slave pseudo terminal + if (::grantpt(m_master_fd) < 0) { + if (error_str) + ::strerror_r(errno, error_str, error_len); + CloseMasterFileDescriptor(); + return false; + } - // Clear the lock flag on the slave pseudo terminal - if (::unlockpt (m_master_fd) < 0) - { - if (error_str) - ::strerror_r (errno, error_str, error_len); - CloseMasterFileDescriptor (); - return false; - } + // Clear the lock flag on the slave pseudo terminal + if (::unlockpt(m_master_fd) < 0) { + if (error_str) + ::strerror_r(errno, error_str, error_len); + CloseMasterFileDescriptor(); + return false; + } - return true; + return true; } //---------------------------------------------------------------------- @@ -140,34 +126,29 @@ PseudoTerminal::OpenFirstAvailableMaster (int oflag, char *error_str, size_t err // RETURNS: // Zero when successful, non-zero indicating an error occurred. //---------------------------------------------------------------------- -bool -PseudoTerminal::OpenSlave (int oflag, char *error_str, size_t error_len) -{ - if (error_str) - error_str[0] = '\0'; +bool PseudoTerminal::OpenSlave(int oflag, char *error_str, size_t error_len) { + if (error_str) + error_str[0] = '\0'; - CloseSlaveFileDescriptor(); + CloseSlaveFileDescriptor(); - // Open the master side of a pseudo terminal - const char *slave_name = GetSlaveName (error_str, error_len); + // Open the master side of a pseudo terminal + const char *slave_name = GetSlaveName(error_str, error_len); - if (slave_name == nullptr) - return false; + if (slave_name == nullptr) + return false; - m_slave_fd = ::open (slave_name, oflag); + m_slave_fd = ::open(slave_name, oflag); - if (m_slave_fd < 0) - { - if (error_str) - ::strerror_r (errno, error_str, error_len); - return false; - } + if (m_slave_fd < 0) { + if (error_str) + ::strerror_r(errno, error_str, error_len); + return false; + } - return true; + return true; } - - //---------------------------------------------------------------------- // Get the name of the slave pseudo terminal. A master pseudo terminal // should already be valid prior to calling this function (see @@ -179,27 +160,25 @@ PseudoTerminal::OpenSlave (int oflag, char *error_str, size_t error_len) // that comes from static memory, so a copy of the string should be // made as subsequent calls can change this value. //---------------------------------------------------------------------- -const char* -PseudoTerminal::GetSlaveName (char *error_str, size_t error_len) const -{ - if (error_str) - error_str[0] = '\0'; +const char *PseudoTerminal::GetSlaveName(char *error_str, + size_t error_len) const { + if (error_str) + error_str[0] = '\0'; - if (m_master_fd < 0) - { - if (error_str) - ::snprintf (error_str, error_len, "%s", "master file descriptor is invalid"); - return nullptr; - } - const char *slave_name = ::ptsname (m_master_fd); + if (m_master_fd < 0) { + if (error_str) + ::snprintf(error_str, error_len, "%s", + "master file descriptor is invalid"); + return nullptr; + } + const char *slave_name = ::ptsname(m_master_fd); - if (error_str && slave_name == nullptr) - ::strerror_r (errno, error_str, error_len); + if (error_str && slave_name == nullptr) + ::strerror_r(errno, error_str, error_len); - return slave_name; + return slave_name; } - //---------------------------------------------------------------------- // Fork a child process and have its stdio routed to a pseudo terminal. // @@ -221,74 +200,62 @@ PseudoTerminal::GetSlaveName (char *error_str, size_t error_len) const // in the parent process: the pid of the child, or -1 if fork fails // in the child process: zero //---------------------------------------------------------------------- -lldb::pid_t -PseudoTerminal::Fork (char *error_str, size_t error_len) -{ - if (error_str) - error_str[0] = '\0'; - pid_t pid = LLDB_INVALID_PROCESS_ID; +lldb::pid_t PseudoTerminal::Fork(char *error_str, size_t error_len) { + if (error_str) + error_str[0] = '\0'; + pid_t pid = LLDB_INVALID_PROCESS_ID; #if !defined(LLDB_DISABLE_POSIX) - int flags = O_RDWR; - flags |= O_CLOEXEC; - if (OpenFirstAvailableMaster (flags, error_str, error_len)) - { - // Successfully opened our master pseudo terminal - - pid = ::fork (); - if (pid < 0) - { - // Fork failed - if (error_str) - ::strerror_r (errno, error_str, error_len); - } - else if (pid == 0) - { - // Child Process - ::setsid(); - - if (OpenSlave (O_RDWR, error_str, error_len)) - { - // Successfully opened slave - - // Master FD should have O_CLOEXEC set, but let's close it just in case... - CloseMasterFileDescriptor (); + int flags = O_RDWR; + flags |= O_CLOEXEC; + if (OpenFirstAvailableMaster(flags, error_str, error_len)) { + // Successfully opened our master pseudo terminal + + pid = ::fork(); + if (pid < 0) { + // Fork failed + if (error_str) + ::strerror_r(errno, error_str, error_len); + } else if (pid == 0) { + // Child Process + ::setsid(); + + if (OpenSlave(O_RDWR, error_str, error_len)) { + // Successfully opened slave + + // Master FD should have O_CLOEXEC set, but let's close it just in + // case... + CloseMasterFileDescriptor(); #if defined(TIOCSCTTY) - // Acquire the controlling terminal - if (::ioctl (m_slave_fd, TIOCSCTTY, (char *)0) < 0) - { - if (error_str) - ::strerror_r (errno, error_str, error_len); - } + // Acquire the controlling terminal + if (::ioctl(m_slave_fd, TIOCSCTTY, (char *)0) < 0) { + if (error_str) + ::strerror_r(errno, error_str, error_len); + } #endif - // Duplicate all stdio file descriptors to the slave pseudo terminal - if (::dup2 (m_slave_fd, STDIN_FILENO) != STDIN_FILENO) - { - if (error_str && !error_str[0]) - ::strerror_r (errno, error_str, error_len); - } - - if (::dup2 (m_slave_fd, STDOUT_FILENO) != STDOUT_FILENO) - { - if (error_str && !error_str[0]) - ::strerror_r (errno, error_str, error_len); - } - - if (::dup2 (m_slave_fd, STDERR_FILENO) != STDERR_FILENO) - { - if (error_str && !error_str[0]) - ::strerror_r (errno, error_str, error_len); - } - } + // Duplicate all stdio file descriptors to the slave pseudo terminal + if (::dup2(m_slave_fd, STDIN_FILENO) != STDIN_FILENO) { + if (error_str && !error_str[0]) + ::strerror_r(errno, error_str, error_len); } - else - { - // Parent Process - // Do nothing and let the pid get returned! + + if (::dup2(m_slave_fd, STDOUT_FILENO) != STDOUT_FILENO) { + if (error_str && !error_str[0]) + ::strerror_r(errno, error_str, error_len); } + + if (::dup2(m_slave_fd, STDERR_FILENO) != STDERR_FILENO) { + if (error_str && !error_str[0]) + ::strerror_r(errno, error_str, error_len); + } + } + } else { + // Parent Process + // Do nothing and let the pid get returned! } + } #endif - return pid; + return pid; } //---------------------------------------------------------------------- @@ -300,11 +267,7 @@ PseudoTerminal::Fork (char *error_str, size_t error_len) // Returns the master file descriptor, or -1 if the master file // descriptor is not currently valid. //---------------------------------------------------------------------- -int -PseudoTerminal::GetMasterFileDescriptor () const -{ - return m_master_fd; -} +int PseudoTerminal::GetMasterFileDescriptor() const { return m_master_fd; } //---------------------------------------------------------------------- // The slave file descriptor accessor. @@ -312,11 +275,7 @@ PseudoTerminal::GetMasterFileDescriptor () const // Returns the slave file descriptor, or -1 if the slave file // descriptor is not currently valid. //---------------------------------------------------------------------- -int -PseudoTerminal::GetSlaveFileDescriptor () const -{ - return m_slave_fd; -} +int PseudoTerminal::GetSlaveFileDescriptor() const { return m_slave_fd; } //---------------------------------------------------------------------- // Release ownership of the master pseudo terminal file descriptor @@ -324,15 +283,13 @@ PseudoTerminal::GetSlaveFileDescriptor () const // master file descriptor if the ownership isn't released using this // call and the master file descriptor has been opened. //---------------------------------------------------------------------- -int -PseudoTerminal::ReleaseMasterFileDescriptor () -{ - // Release ownership of the master pseudo terminal file - // descriptor without closing it. (the destructor for this - // class will close it otherwise!) - int fd = m_master_fd; - m_master_fd = invalid_fd; - return fd; +int PseudoTerminal::ReleaseMasterFileDescriptor() { + // Release ownership of the master pseudo terminal file + // descriptor without closing it. (the destructor for this + // class will close it otherwise!) + int fd = m_master_fd; + m_master_fd = invalid_fd; + return fd; } //---------------------------------------------------------------------- @@ -341,14 +298,11 @@ PseudoTerminal::ReleaseMasterFileDescriptor () // slave file descriptor if the ownership isn't released using this // call and the slave file descriptor has been opened. //---------------------------------------------------------------------- -int -PseudoTerminal::ReleaseSlaveFileDescriptor () -{ - // Release ownership of the slave pseudo terminal file - // descriptor without closing it (the destructor for this - // class will close it otherwise!) - int fd = m_slave_fd; - m_slave_fd = invalid_fd; - return fd; +int PseudoTerminal::ReleaseSlaveFileDescriptor() { + // Release ownership of the slave pseudo terminal file + // descriptor without closing it (the destructor for this + // class will close it otherwise!) + int fd = m_slave_fd; + m_slave_fd = invalid_fd; + return fd; } - |
