diff options
Diffstat (limited to 'usr/src/lib/libast/common/comp/open.c')
| -rw-r--r-- | usr/src/lib/libast/common/comp/open.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/usr/src/lib/libast/common/comp/open.c b/usr/src/lib/libast/common/comp/open.c new file mode 100644 index 0000000000..b9667d859b --- /dev/null +++ b/usr/src/lib/libast/common/comp/open.c @@ -0,0 +1,119 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped + +/* + * -last 3 arg open + */ + +#include <ast.h> + +#if !defined(open) || !defined(_ast_O_LOCAL) + +NoN(open) + +#else + +#undef open + +extern int open(const char*, int, ...); + +#include <ls.h> +#include <error.h> + +#ifdef O_NOCTTY +#include <ast_tty.h> +#endif + +int +_ast_open(const char* path, int op, ...) +{ + int fd; + int mode; + int save_errno; + struct stat st; + va_list ap; + + save_errno = errno; + va_start(ap, op); + mode = (op & O_CREAT) ? va_arg(ap, int) : S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; + va_end(ap); + if (op & ~(_ast_O_LOCAL-1)) + { + if (!(op & O_CREAT)) + op &= ~O_EXCL; + for (;;) + { + if (op & O_TRUNC) + { + if ((op & O_EXCL) && !access(path, F_OK)) + { + errno = EEXIST; + return(-1); + } + if ((fd = creat(path, (op & O_EXCL) ? 0 : mode)) < 0) + return(-1); + if (op & O_EXCL) + { + if (fstat(fd, &st) || (st.st_mode & S_IPERM)) + { + errno = EEXIST; + close(fd); + return(-1); + } +#if _lib_fchmod + if (mode && fchmod(fd, mode)) +#else + if (mode && chmod(path, mode)) +#endif + errno = save_errno; + } + if ((op & O_ACCMODE) == O_RDWR) + { + close(fd); + op &= ~(O_CREAT|O_TRUNC); + continue; + } + } + else if ((fd = open(path, op & (_ast_O_LOCAL-1), mode)) < 0) + { + if (op & O_CREAT) + { + op |= O_TRUNC; + continue; + } + return(-1); + } + else if ((op & O_APPEND) && lseek(fd, 0L, SEEK_END) == -1L) + errno = save_errno; +#if O_NOCTTY + if ((op & O_NOCTTY) && ioctl(fd, TIOCNOTTY, 0)) + errno = save_errno; +#endif + break; + } + } + else fd = open(path, op, mode); + return(fd); +} + +#endif |