Operating System

include: co/os.h.

#os

#os::cpunum

int cpunum();
  • Returns the number of system CPU cores.

#os::cwd

fastring cwd();
  • Returns path of the current working directory.
  • On windows, \ in the results will be converted to /.

#os::daemon

void daemon();
  • Put the current process to run in the background, for linux only.

#os::env

1. fastring env(const char* name);
2. bool env(const char* name, const char* value);
  • 1, get value of the environment variable.
  • 2, added in v2.0.2, set value of the environment variable, return true on success, otherwise false.

#os::exename

fastring exename();
  • Returns name of the current process (without path).

#os::exepath

fastring exepath();
  • Returns the full path of the current process.
  • On windows, \ in the results will be converted to /.

#os::homedir

fastring homedir();
  • Returns path of the home directory of the current user.
  • On windows, \ in the results will be converted to /.

#os::pid

int pid();
  • Returns the id of the current process.

#os::signal

typedef void (*sig_handler_t)(int);
sig_handler_t signal(int sig, sig_handler_t handler, int flag=0);

  • Set a handler for a signal, the parameter sig is the signal value, and the parameter flag is the combination of SA_RESTART, SA_ONSTACK or other options.

  • The parameter flag is only applicable to linux/mac platforms.

  • This function returns the old signal handler.

  • Example

void f(int);
os::signal(SIGINT, f);        // user defined handler
os::signal(SIGABRT, SIG_DFL); // default handler
os::signal(SIGPIPE, SIG_IGN); // ignore SIGPIPE