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/* oslib.c - functions present only in some unix versions. */
/* Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA */
#include <config.h>
#include <bashtypes.h>
#ifndef _MINIX
# include <sys/param.h>
#endif
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <posixstat.h>
#include <filecntl.h>
#include <bashansi.h>
#include <stdio.h>
#include <errno.h>
#include <chartypes.h>
#include <shell.h>
#if !defined (errno)
extern int errno;
#endif /* !errno */
/* Make the functions strchr and strrchr if they do not exist. */
#if !defined (HAVE_STRCHR)
char *
strchr (string, c)
char *string;
int c;
{
register char *s;
for (s = string; s && *s; s++)
if (*s == c)
return (s);
return ((char *) NULL);
}
char *
strrchr (string, c)
char *string;
int c;
{
register char *s, *t;
for (s = string, t = (char *)NULL; s && *s; s++)
if (*s == c)
t = s;
return (t);
}
#endif /* !HAVE_STRCHR */
#if !defined (HAVE_DUP2) || defined (DUP2_BROKEN)
/* Replacement for dup2 (), for those systems which either don't have it,
or supply one with broken behaviour. */
int
dup2 (fd1, fd2)
int fd1, fd2;
{
int saved_errno, r;
/* If FD1 is not a valid file descriptor, then return immediately with
an error. */
if (fcntl (fd1, F_GETFL, 0) == -1)
return (-1);
if (fd2 < 0 || fd2 >= getdtablesize ())
{
errno = EBADF;
return (-1);
}
if (fd1 == fd2)
return (0);
saved_errno = errno;
(void) close (fd2);
r = fcntl (fd1, F_DUPFD, fd2);
if (r >= 0)
errno = saved_errno;
else
if (errno == EINVAL)
errno = EBADF;
/* Force the new file descriptor to remain open across exec () calls. */
SET_OPEN_ON_EXEC (fd2);
return (r);
}
#endif /* !HAVE_DUP2 */
/*
* Return the total number of available file descriptors.
*
* On some systems, like 4.2BSD and its descendents, there is a system call
* that returns the size of the descriptor table: getdtablesize(). There are
* lots of ways to emulate this on non-BSD systems.
*
* On System V.3, this can be obtained via a call to ulimit:
* return (ulimit(4, 0L));
*
* On other System V systems, NOFILE is defined in /usr/include/sys/param.h
* (this is what we assume below), so we can simply use it:
* return (NOFILE);
*
* On POSIX systems, there are specific functions for retrieving various
* configuration parameters:
* return (sysconf(_SC_OPEN_MAX));
*
*/
#if !defined (HAVE_GETDTABLESIZE)
int
getdtablesize ()
{
# if defined (_POSIX_VERSION) && defined (HAVE_SYSCONF) && defined (_SC_OPEN_MAX)
return (sysconf(_SC_OPEN_MAX)); /* Posix systems use sysconf */
# else /* ! (_POSIX_VERSION && HAVE_SYSCONF && _SC_OPEN_MAX) */
# if defined (ULIMIT_MAXFDS)
return (ulimit (4, 0L)); /* System V.3 systems use ulimit(4, 0L) */
# else /* !ULIMIT_MAXFDS */
# if defined (NOFILE) /* Other systems use NOFILE */
return (NOFILE);
# else /* !NOFILE */
return (20); /* XXX - traditional value is 20 */
# endif /* !NOFILE */
# endif /* !ULIMIT_MAXFDS */
# endif /* ! (_POSIX_VERSION && _SC_OPEN_MAX) */
}
#endif /* !HAVE_GETDTABLESIZE */
#if !defined (HAVE_BCOPY)
# if defined (bcopy)
# undef bcopy
# endif
void
bcopy (s,d,n)
char *d, *s;
int n;
{
FASTCOPY (s, d, n);
}
#endif /* !HAVE_BCOPY */
#if !defined (HAVE_BZERO)
# if defined (bzero)
# undef bzero
# endif
void
bzero (s, n)
char *s;
int n;
{
register int i;
register char *r;
for (i = 0, r = s; i < n; i++)
*r++ = '\0';
}
#endif
#if !defined (HAVE_GETHOSTNAME)
# if defined (HAVE_UNAME)
# include <sys/utsname.h>
int
gethostname (name, namelen)
char *name;
int namelen;
{
int i;
struct utsname ut;
--namelen;
uname (&ut);
i = strlen (ut.nodename) + 1;
strncpy (name, ut.nodename, i < namelen ? i : namelen);
name[namelen] = '\0';
return (0);
}
# else /* !HAVE_UNAME */
int
gethostname (name, namelen)
int name, namelen;
{
strncpy (name, "unknown", namelen);
name[namelen] = '\0';
return 0;
}
# endif /* !HAVE_UNAME */
#endif /* !HAVE_GETHOSTNAME */
#if !defined (HAVE_KILLPG)
int
killpg (pgrp, sig)
pid_t pgrp;
int sig;
{
return (kill (-pgrp, sig));
}
#endif /* !HAVE_KILLPG */
#if !defined (HAVE_MKFIFO) && defined (PROCESS_SUBSTITUTION)
int
mkfifo (path, mode)
char *path;
int mode;
{
#if defined (S_IFIFO)
return (mknod (path, (mode | S_IFIFO), 0));
#else /* !S_IFIFO */
return (-1);
#endif /* !S_IFIFO */
}
#endif /* !HAVE_MKFIFO && PROCESS_SUBSTITUTION */
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