/* * unistd.h - standard system calls */ /* $Id$ */ #ifndef _UNISTD_H #define _UNISTD_H #include /* Types */ typedef int pid_t; typedef int mode_t; /* Constants for file access (open and friends) */ enum { O_ACCMODE = 0x3, O_RDONLY = 0, O_WRONLY = 1, O_RDWR = 2, O_CREAT = 0100, O_TRUNC = 01000, O_APPEND = 02000, O_NONBLOCK = 04000 }; /* Special variables */ extern char** environ; /* Implemented system calls */ extern void _exit(int); extern pid_t getpid(void); extern void* sbrk(intptr_t increment); extern int isatty(int d); extern off_t lseek(int fildes, off_t offset, int whence); extern int close(int d); extern int open(const char* path, int access, ...); extern int creat(const char* path, mode_t mode); extern int read(int fd, void* buffer, size_t count); extern int write(int fd, void* buffer, size_t count); /* Unimplemented system calls (these are just prototypes to let the library * compile). */ extern int fcntl(int fd, int op, ...); /* Signal handling */ typedef int sig_atomic_t; #define SIG_ERR ((sighandler_t) -1) /* Error return. */ #define SIG_DFL ((sighandler_t) 0) /* Default action. */ #define SIG_IGN ((sighandler_t) 1) /* Ignore signal. */ #define SIGABRT 6 /* Abort (ANSI) */ #define SIGILL 11 /* Illegal instruction */ #define _NSIG 32 /* Biggest signal number + 1 (not including real-time signals). */ typedef void (*sighandler_t)(int); extern sighandler_t signal(int signum, sighandler_t handler); extern int raise(int signum); #endif