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68 lines
1.3 KiB
68 lines
1.3 KiB
#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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int openpty(int* amaster, int* aslave, char* name, struct termios* termp, struct winsize* winp)
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{
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char buf[512];
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int master = open("/dev/ptmx", O_RDWR);
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if (master == -1) return -1;
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if (grantpt(master) || unlockpt(master) || ptsname_r(master, buf, sizeof buf)) goto fail;
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int slave = open(buf, O_RDWR | O_NOCTTY);
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if (slave == -1) goto fail;
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/* XXX Should we ignore errors here? */
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if (termp) tcsetattr(slave, TCSAFLUSH, termp);
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if (winp) ioctl(slave, TIOCSWINSZ, winp);
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*amaster = master;
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*aslave = slave;
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if (name != NULL) strcpy(name, buf);
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return 0;
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fail:
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close(master);
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return -1;
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}
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int login_tty(int fd)
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{
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setsid();
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if (ioctl(fd, TIOCSCTTY, NULL) == -1) return -1;
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dup2(fd, 0);
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dup2(fd, 1);
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dup2(fd, 2);
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if (fd > 2) close(fd);
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return 0;
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}
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int forkpty(int* amaster, char* name, struct termios* termp, struct winsize* winp)
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{
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int master, slave;
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if (openpty(&master, &slave, name, termp, winp) == -1) {
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return -1;
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}
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int pid;
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switch (pid = fork()) {
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case -1:
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return -1;
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case 0:
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close(master);
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if (login_tty(slave)) _exit(1);
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return 0;
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default:
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*amaster = master;
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close (slave);
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return pid;
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}
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}
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