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Work around the problems caused by calling issetugid() in libtermcap in

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a similar way to libc. Sigh.  This is not pretty but seems to work.
Somthing like this was needed in preference to bogusly bumping the major
library number here.

The syscall(SYS_issetugid) idea is originally Bruce's.
This commit is contained in:
Peter Wemm 1997-11-29 11:30:57 +00:00
parent 188e643401
commit cf8e055700
1 changed files with 41 additions and 2 deletions

43
lib/libtermcap/termcap.c

@ -45,6 +45,9 @@ static char sccsid[] = "@(#)termcap.c 8.1 (Berkeley) 6/4/93";
#include <string.h>
#include <unistd.h>
#include <termios.h>
#include <signal.h>
#include <errno.h>
#include <sys/syscall.h>
#include "termcap.h"
#include "pathnames.h"
@ -64,6 +67,8 @@ static char sccsid[] = "@(#)termcap.c 8.1 (Berkeley) 6/4/93";
static char *tbuf; /* termcap buffer */
static int use_issetugid = 1; /* 0 = not present, 1 = try it, 2 = exists */
/*
* Get an entry for terminal name in buffer bp from the termcap file.
*/
@ -115,8 +120,42 @@ tgetent(char *bp, const char *name)
strncpy(pathbuf, cp, PBUFSIZ); /* still can be tokenized */
pathbuf[PBUFSIZ - 1] = '\0';
if (issetugid())
strcpy(pathbuf, _PATH_DEF_SEC);
#ifdef SYS_issetugid
/*
* This stuff is to try and detect the presence of the issetugid()
* syscall without breaking dynamic linking during compiles.. Sigh.
*/
othersyscall:
if (use_issetugid) {
struct sigaction sa, osa;
int sigsys_installed = 0;
int unsafe;
if (use_issetugid == 1) {
bzero(&sa, sizeof(sa));
sa.sa_handler = SIG_IGN;
if (sigaction(SIGSYS, &sa, &osa) >= 0)
sigsys_installed = 1;
}
errno = 0;
unsafe = syscall(SYS_issetugid);
if (sigsys_installed == 1) {
int oerrno = errno;
sigaction(SIGSYS, &osa, NULL);
errno = oerrno;
}
if (errno == ENOSYS || errno == EINVAL) {
use_issetugid = 0;
goto othersyscall;
} else if (sigsys_installed == 1)
sigsys_installed = 2;
if (unsafe)
strcpy(pathbuf, _PATH_DEF_SEC);
} else
#endif /* SYS_issetugid */
/* issetugid() not in kernel or undefined - try second best */
if (getuid() != geteid() || getgid() != getegid())
strcpy(pathbuf, _PATH_DEF_SEC);
*fname++ = pathbuf; /* tokenize path into vector of names */
while (*++p)