438b4ac286
Testcase: script -q -c "echo hey" /dev/null 0>&- Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini getpty implementation for busybox
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* Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#define DEBUG 0
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int FAST_FUNC xgetpty(char *line)
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{
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int p;
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#if ENABLE_FEATURE_DEVPTS
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p = open("/dev/ptmx", O_RDWR);
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if (p >= 0) {
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grantpt(p); /* chmod+chown corresponding slave pty */
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unlockpt(p); /* (what does this do?) */
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# ifndef HAVE_PTSNAME_R
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{
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const char *name;
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name = ptsname(p); /* find out the name of slave pty */
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if (!name) {
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bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)");
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}
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safe_strncpy(line, name, GETPTY_BUFSIZE);
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}
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# else
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/* find out the name of slave pty */
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if (ptsname_r(p, line, GETPTY_BUFSIZE-1) != 0) {
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bb_perror_msg_and_die("ptsname error (is /dev/pts mounted?)");
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}
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line[GETPTY_BUFSIZE-1] = '\0';
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# endif
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return p;
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}
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#else
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struct stat stb;
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int i;
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int j;
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strcpy(line, "/dev/ptyXX");
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for (i = 0; i < 16; i++) {
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line[8] = "pqrstuvwxyzabcde"[i];
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line[9] = '0';
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if (stat(line, &stb) < 0) {
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continue;
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}
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for (j = 0; j < 16; j++) {
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line[9] = j < 10 ? j + '0' : j - 10 + 'a';
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if (DEBUG)
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fprintf(stderr, "Trying to open device: %s\n", line);
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p = open(line, O_RDWR | O_NOCTTY);
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if (p >= 0) {
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line[5] = 't';
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return p;
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}
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}
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}
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#endif /* FEATURE_DEVPTS */
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bb_error_msg_and_die("can't find free pty");
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}
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