Defined in 4 files as a macro:

• include/spawn.h, line 42 (as a macro)
• include/termios.h, line 32 (as a macro)
• include/unistd.h, line 104 (as a macro)
• include/utmpx.h, line 67 (as a macro)

Referenced in 4 files:

• include/spawn.h, line 40
• include/termios.h, line 30
• include/unistd.h, line 103
• include/utmpx.h, line 66