diff options
Diffstat (limited to 'lib/sh/oslib.c')
| -rw-r--r-- | lib/sh/oslib.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/lib/sh/oslib.c b/lib/sh/oslib.c new file mode 100644 index 0000000..edc5c6f --- /dev/null +++ b/lib/sh/oslib.c @@ -0,0 +1,301 @@ +/* oslib.c - functions present only in some unix versions. */ + +/* Copyright (C) 1995,2010 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <config.h> + +#include <bashtypes.h> +#if defined (HAVE_SYS_PARAM_H) +# include <sys/param.h> +#endif + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif + +#if defined (HAVE_LIMITS_H) +# include <limits.h> +#endif + +#include <posixstat.h> +#include <filecntl.h> +#include <bashansi.h> + +#if !defined (HAVE_KILLPG) +# include <signal.h> +#endif + +#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 descendants, 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) + void *d, *s; + size_t n; +{ + FASTCOPY (s, d, n); +} +#endif /* !HAVE_BCOPY */ + +#if !defined (HAVE_BZERO) +# if defined (bzero) +# undef bzero +# endif +void +bzero (s, n) + void *s; + size_t 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; + size_t 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) + char *name; + size_t 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; + mode_t 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 */ + +#define DEFAULT_MAXGROUPS 64 + +int +getmaxgroups () +{ + static int maxgroups = -1; + + if (maxgroups > 0) + return maxgroups; + +#if defined (HAVE_SYSCONF) && defined (_SC_NGROUPS_MAX) + maxgroups = sysconf (_SC_NGROUPS_MAX); +#else +# if defined (NGROUPS_MAX) + maxgroups = NGROUPS_MAX; +# else /* !NGROUPS_MAX */ +# if defined (NGROUPS) + maxgroups = NGROUPS; +# else /* !NGROUPS */ + maxgroups = DEFAULT_MAXGROUPS; +# endif /* !NGROUPS */ +# endif /* !NGROUPS_MAX */ +#endif /* !HAVE_SYSCONF || !SC_NGROUPS_MAX */ + + if (maxgroups <= 0) + maxgroups = DEFAULT_MAXGROUPS; + + return maxgroups; +} + +long +getmaxchild () +{ + static long maxchild = -1L; + + if (maxchild > 0) + return maxchild; + +#if defined (HAVE_SYSCONF) && defined (_SC_CHILD_MAX) + maxchild = sysconf (_SC_CHILD_MAX); +#else +# if defined (CHILD_MAX) + maxchild = CHILD_MAX; +# else +# if defined (MAXUPRC) + maxchild = MAXUPRC; +# endif /* MAXUPRC */ +# endif /* CHILD_MAX */ +#endif /* !HAVE_SYSCONF || !_SC_CHILD_MAX */ + + return (maxchild); +} |