a C standard library for fx Casio calculators
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fxlibc/include/unistd.h

91 lines
2.5 KiB

#ifndef __LIB_UNISTD_H__
# define __LIB_UNISTD_H__
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
//---
// Process part
///---
/* Get the process ID of the calling process. */
extern pid_t getpid(void);
/* Get the process group ID of the calling process. */
extern pid_t getpgid(void);
/* Get the process ID of the calling process's parent. */
extern pid_t getppid(void);
/*
** Set the process group ID of the process matching PID to PGID.
** If PID is zero, the current process's process group ID is set.
** If PGID is zero, the process ID of the process is used.
*/
extern int setpgid(pid_t __pid, pid_t __pgid);
//---
// File part
//---
/* Standard file descriptors. */
#define STDIN_FILENO 0 /* Standard input. */
#define STDOUT_FILENO 1 /* Standard output. */
#define STDERR_FILENO 2 /* Standard error output. */
/*
** Write N bytes of BUF to FD.
** Return the number written, or -1.
*/
extern ssize_t write(int __fd, const void *__buf, size_t __nbytes);
/*
** Read NBYTES into BUF from FD.
** Return the number read, -1 for errors or 0 for EOF.
*/
extern ssize_t read(int __fd, void *__buf, size_t __nbytes);
/*
** Read NBYTES into BUF from FD at the given position OFFSET without
** changing the file pointer.
** Return the number read, -1 for errors or 0 for EOF.
*/
extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, off_t __offset);
/*
** Write N bytes of BUF to FD at the given position OFFSET without
** changing the file pointer.
** Return the number written, or -1.
*/
extern ssize_t pwrite (int __fd, const void *__buf, size_t __n, off_t __offset);
/* Values for the WHENCE argument to lseek. */
#define SEEK_SET 0 /* Seek from beginning of file. */
#define SEEK_CUR 1 /* Seek from current position. */
#define SEEK_END 2 /* Seek from end of file. */
/*
** Move FD's file position to OFFSET bytes from the beginning of the file
** (if WHENCE is SEEK_SET), the current position (if WHENCE is SEEK_CUR),
** or the end of the file (if WHENCE is SEEK_END).
** Return the new file position.
*/
extern off_t lseek (int __fd, off_t __offset, int __whence);
/* Close the file descriptor FD */
extern int close(int __fd);
//---
// System part
//---
/*
** Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
** the `_SC_*' symbols for the NAME argument to `sysconf'; and the `_CS_*'
** symbols for the NAME argument to `confstr'.
*/
#include <bits/confname.h>
/* Get the value of the system variable NAME. */
extern long int sysconf(int __name);
#endif /*__LIB_UNISTD_H__*/