86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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* unistd.h - standard system calls
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*/
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#ifndef _UNISTD_H
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#define _UNISTD_H
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#include <stddef.h>
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/* Types */
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typedef int pid_t;
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typedef int mode_t;
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/* Constants for file access (open and friends) */
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enum
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{
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O_ACCMODE = 0x3,
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O_RDONLY = 0,
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O_WRONLY = 1,
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O_RDWR = 2,
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O_CREAT = 0100,
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O_TRUNC = 01000,
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O_APPEND = 02000,
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O_NONBLOCK = 04000
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};
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/* Special variables */
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extern char** environ;
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/* Implemented system calls */
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extern void _exit(int);
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extern pid_t getpid(void);
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extern int brk(void* addr);
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extern void* sbrk(int increment);
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extern int isatty(int d);
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extern off_t lseek(int fildes, off_t offset, int whence);
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extern int close(int d);
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extern int open(const char* path, int access, ...);
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extern int creat(const char* path, mode_t mode);
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extern int read(int fd, void* buffer, size_t count);
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extern int write(int fd, void* buffer, size_t count);
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/* Unimplemented system calls (these are just prototypes to let the library
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* compile). */
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extern int fcntl(int fd, int op, ...);
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/* Signal handling */
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typedef int sig_atomic_t;
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#define SIG_ERR ((sighandler_t) -1) /* Error return. */
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#define SIG_DFL ((sighandler_t) 0) /* Default action. */
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#define SIG_IGN ((sighandler_t) 1) /* Ignore signal. */
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#define _NSIG 16 /* number of signals used */
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#define SIGHUP 1 /* hangup */
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#define SIGINT 2 /* interrupt (DEL) */
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#define SIGQUIT 3 /* quit (ASCII FS) */
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#define SIGILL 4 /* illegal instruction */
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#define SIGTRAP 5 /* trace trap (not reset when caught) */
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#define SIGABRT 6 /* IOT instruction */
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#define SIGIOT 6 /* SIGABRT for people who speak PDP-11 */
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#define SIGEMT 7 /* EMT instruction */
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#define SIGFPE 8 /* floating point exception */
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#define SIGKILL 9 /* kill (cannot be caught or ignored) */
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#define SIGBUS 10 /* bus error */
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#define SIGSEGV 11 /* segmentation violation */
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#define SIGSYS 12 /* bad argument to system call */
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#define SIGPIPE 13 /* write on a pipe with no one to read it */
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#define SIGALRM 14 /* alarm clock */
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#define SIGTERM 15 /* software termination signal from kill */
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typedef void (*sighandler_t)(int);
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extern sighandler_t signal(int signum, sighandler_t handler);
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extern int raise(int signum);
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#endif
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