51 lines
924 B
C
51 lines
924 B
C
#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#define _PATH_PTS "/dev/pts"
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#define MASTER_PTY(dev) (major(dev) == 128)
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#define SLAVE_PTY(dev) (major(dev) == 136)
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int posix_openpt(int flags)
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{
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return open("/dev/ptmx", flags);
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}
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int ptsname_r(int fd, char* buf, size_t buflen)
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{
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int len = strlen(_PATH_PTS);
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if (buflen < len + 2) {
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set_errno(ERANGE);
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return -ERANGE;
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}
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stat_t stat;
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if (fstat(fd, &stat) < 0) {
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return errno;
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}
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if (!MASTER_PTY(stat.st_dev)) {
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set_errno(ENOTTY);
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return -ENOTTY;
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}
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int ptyno = minor(stat.st_dev);
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char* p = strcpy(buf, _PATH_PTS);
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p[len + 0] = '0' + ptyno;
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p[len + 1] = '\0';
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return 0;
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}
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static char ptsbuf[32];
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char* ptsname(int fd)
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{
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if (ptsname_r(fd, ptsbuf, sizeof(ptsbuf)) < 0) {
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return NULL;
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}
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return ptsbuf;
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}
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