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