99 lines
1.8 KiB
C
99 lines
1.8 KiB
C
#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stropts.h>
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#include <fcntl.h>
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#include <termios.h>
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#define TM_YEAR_ORIGIN 1900
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int openpty(int *amaster, int *aslave, char *name, void *termp, void *winp) {
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int ptm;
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char *pname;
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int pts;
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ptm = open("/dev/ptmx", O_RDWR);
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grantpt(ptm);
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unlockpt(ptm);
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pname = ptsname(ptm);
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if (name != NULL) {
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strcpy(name, pname);
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}
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pts = open(pname, O_RDWR);
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ioctl(pts, I_PUSH, "ptem");
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ioctl(pts, I_PUSH, "ldterm");
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ioctl(pts, I_PUSH, "ttcompat");
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if (termp != NULL) {
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tcsetattr(pts, TCSAFLUSH, termp);
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}
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if (winp != NULL) {
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ioctl(pts, TIOCSWINSZ, winp);
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}
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*amaster = ptm;
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*aslave = pts;
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return 0;
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}
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int forkpty(int *amaster, char *name, void *termp, void *winp) {
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int ptm;
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char *pname;
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int pts;
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pid_t pid;
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ptm = open("/dev/ptmx", O_RDWR);
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grantpt(ptm);
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unlockpt(ptm);
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pname = ptsname(ptm);
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if (name != NULL) {
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strcpy(name, pname);
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}
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pts = open(pname, O_RDWR);
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ioctl(pts, I_PUSH, "ptem");
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ioctl(pts, I_PUSH, "ldterm");
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ioctl(pts, I_PUSH, "ttcompat");
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if (termp != NULL) {
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tcsetattr(pts, TCSAFLUSH, termp);
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}
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if (winp != NULL) {
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ioctl(pts, TIOCSWINSZ, winp);
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}
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pid = fork();
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if (!pid) {
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close(ptm);
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dup2(pts, 0);
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dup2(pts, 1);
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dup2(pts, 2);
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close(pts);
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} else {
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*amaster = ptm;
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}
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return pid;
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}
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static long difftm(struct tm *a, struct tm *b) {
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int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
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int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
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long days = (a->tm_yday - b->tm_yday + ((ay >> 2) - (by >> 2)) - (ay / 100 - by / 100) + ((ay / 100 >> 2) - (by / 100 >> 2)) + (long)(ay - by) * 365);
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return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
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}
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long gmtoff(time_t value) {
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struct tm gmt = *gmtime(&value);
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return difftm(localtime(&value), &gmt);
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}
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