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Diffstat (limited to 'libbb/syscalls.c')
| -rw-r--r-- | libbb/syscalls.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libbb/syscalls.c b/libbb/syscalls.c new file mode 100644 index 000000000..765868840 --- /dev/null +++ b/libbb/syscalls.c @@ -0,0 +1,135 @@ +/* vi: set sw=4 ts=4: */ +/* + * some system calls possibly missing from libc + * + * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen + * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org> + * + * This program 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 of the License, or + * (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <stdio.h> +#include <errno.h> +#include <unistd.h> +/* Kernel headers before 2.1.mumble need this on the Alpha to get + _syscall* defined. */ +#define __LIBRARY__ +#include <sys/syscall.h> +#if __GNU_LIBRARY__ < 5 +/* This is needed for libc5 */ +#include <asm/unistd.h> +#endif +#include "libbb.h" + +#if __GNU_LIBRARY__ < 5 +_syscall3(int, sysfs, int, option, unsigned int, fs_index, char *, buf); +#else +int sysfs( int option, unsigned int fs_index, char * buf) +{ + return(syscall(__NR_sysfs, option, fs_index, buf)); +} +#endif + +#ifndef __NR_pivot_root +#warning This kernel does not support the pivot_root syscall +#warning -> The pivot_root system call is being stubbed out... +int pivot_root(const char * new_root,const char * put_old) +{ + /* BusyBox was compiled against a kernel that did not support + * the pivot_root system call. To make this application work, + * you will need to recompile with a kernel supporting the + * pivot_root system call. + */ + fprintf(stderr, "\n\nTo make this application work, you will need to recompile\n"); + fprintf(stderr, "with a kernel supporting the pivot_root system call. -Erik\n\n"); + errno=ENOSYS; + return -1; +} +#else +# if __GNU_LIBRARY__ < 5 + _syscall2(int,pivot_root,const char *,new_root,const char *,put_old); +# else + int pivot_root(const char * new_root,const char * put_old) + { + return(syscall(__NR_pivot_root, new_root, put_old)); + } +# endif +#endif + + + +/* These syscalls are not included in ancient glibc versions */ +#if __GNU_LIBRARY__ < 5 || ((__GLIBC__ <= 2) && (__GLIBC_MINOR__ < 1)) + + +#if __GNU_LIBRARY__ < 5 +/* These syscalls are not included as part of libc5 */ +_syscall2(int, bdflush, int, func, int, data); +#else +int bdflush(int func, int data) +{ + return(syscall(__NR_bdflush, func, data)); +} +#endif + +#ifndef __alpha__ +#if __GNU_LIBRARY__ < 5 +# define __NR_klogctl __NR_syslog +_syscall3(int, klogctl, int, type, char *, b, int, len); +#else +int klogctl(int type, char *b, int len) +{ + return(syscall(__NR_klogctl, type, b, len)); +} +#endif +#endif + + +int umount2(const char * special_file, int flags) +{ +#ifndef __NR_pivot_root +#warning This kernel does not support the umount2 syscall +#warning -> The umount2 system call is being stubbed out... + /* BusyBox was compiled against a kernel that did not support + * the umount2 system call. To make this application work, + * you will need to recompile with a kernel supporting the + * umount2 system call. + */ + bb_error_msg("\n\nTo make this application work, you will need to recompile\n" + "BusyBox with a kernel supporting the umount2 system call.\n"); + errno=ENOSYS; + return -1; +#else +# if __GNU_LIBRARY__ < 5 + _syscall2(int, umount2, const char *, special_file, int, flags); +# else + return(syscall(__NR_umount2, special_file, flags)); +# endif +#endif +} + + +#endif /* __GNU_LIBRARY__ < 5 || ((__GLIBC__ <= 2) && (__GLIBC_MINOR__ < 1)) */ + + +/* END CODE */ +/* +Local Variables: +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |