?? linux_ptyopen.c
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#include "apue.h"#include <fcntl.h>#ifndef _HAS_OPENPTintposix_openpt(int oflag){ int fdm; fdm = open("/dev/ptmx", oflag); return(fdm);}#endif#ifndef _HAS_PTSNAMEchar *ptsname(int fdm){ int sminor; static char pts_name[16]; if (ioctl(fdm, TIOCGPTN, &sminor) < 0) return(NULL); snprintf(pts_name, sizeof(pts_name), "/dev/pts/%d", sminor); return(pts_name);}#endif#ifndef _HAS_GRANTPTintgrantpt(int fdm){ char *pts_name; pts_name = ptsname(fdm); return(chmod(pts_name, S_IRUSR | S_IWUSR | S_IWGRP));}#endif#ifndef _HAS_UNLOCKPTintunlockpt(int fdm){ int lock = 0; return(ioctl(fdm, TIOCSPTLCK, &lock));}#endifintptym_open(char *pts_name, int pts_namesz){ char *ptr; int fdm; /* * Return the name of the master device so that on failure * the caller can print an error message. Null terminate * to handle case where string length > pts_namesz. */ strncpy(pts_name, "/dev/ptmx", pts_namesz); pts_name[pts_namesz - 1] = '\0'; fdm = posix_openpt(O_RDWR); if (fdm < 0) return(-1); if (grantpt(fdm) < 0) { /* grant access to slave */ close(fdm); return(-2); } if (unlockpt(fdm) < 0) { /* clear slave's lock flag */ close(fdm); return(-3); } if ((ptr = ptsname(fdm)) == NULL) { /* get slave's name */ close(fdm); return(-4); } /* * Return name of slave. Null terminate to handle case * where strlen(ptr) > pts_namesz. */ strncpy(pts_name, ptr, pts_namesz); pts_name[pts_namesz - 1] = '\0'; return(fdm); /* return fd of master */}intptys_open(char *pts_name){ int fds; if ((fds = open(pts_name, O_RDWR)) < 0) return(-5); return(fds);}?? 快捷鍵說明
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