66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
#include <sys/types.h>
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#include <termios.h>
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#ifndef TIOCGWINSZ
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#include <sys/ioctl.h> /* 44BSD requires this too */
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#endif
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#include "ourhdr.h"
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pid_t
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pty_fork(int *ptrfdm, char *slave_name,
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const struct termios *slave_termios,
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const struct winsize *slave_winsize)
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{
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int fdm, fds;
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pid_t pid;
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char pts_name[20];
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if ( (fdm = ptym_open(pts_name)) < 0)
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err_sys("can't open master pty: %s", pts_name);
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if (slave_name != NULL)
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strcpy(slave_name, pts_name); /* return name of slave */
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if ( (pid = fork()) < 0)
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return(-1);
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else if (pid == 0) { /* child */
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if (setsid() < 0)
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err_sys("setsid error");
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/* SVR4 acquires controlling terminal on open() */
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if ( (fds = ptys_open(fdm, pts_name)) < 0)
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err_sys("can't open slave pty");
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close(fdm); /* all done with master in child */
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#if defined(TIOCSCTTY) && !defined(CIBAUD)
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/* 44BSD way to acquire controlling terminal */
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/* !CIBAUD to avoid doing this under SunOS */
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if (ioctl(fds, TIOCSCTTY, (char *) 0) < 0)
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err_sys("TIOCSCTTY error");
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#endif
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/* set slave's termios and window size */
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if (slave_termios != NULL) {
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if (tcsetattr(fds, TCSANOW, slave_termios) < 0)
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err_sys("tcsetattr error on slave pty");
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}
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if (slave_winsize != NULL) {
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if (ioctl(fds, TIOCSWINSZ, slave_winsize) < 0)
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err_sys("TIOCSWINSZ error on slave pty");
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}
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/* slave becomes stdin/stdout/stderr of child */
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if (dup2(fds, STDIN_FILENO) != STDIN_FILENO)
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err_sys("dup2 error to stdin");
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if (dup2(fds, STDOUT_FILENO) != STDOUT_FILENO)
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err_sys("dup2 error to stdout");
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if (dup2(fds, STDERR_FILENO) != STDERR_FILENO)
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err_sys("dup2 error to stderr");
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if (fds > STDERR_FILENO)
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close(fds);
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return(0); /* child returns 0 just like fork() */
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} else { /* parent */
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*ptrfdm = fdm; /* return fd of master */
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return(pid); /* parent returns pid of child */
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}
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}
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