ef0a265086
* VFS and installed MFSes must be in sync before and after this change * Use struct stat from NetBSD. It requires adding new STAT, FSTAT and LSTAT syscalls. Libc modification is both backward and forward compatible. Also new struct stat uses modern field sizes to avoid ABI incompatibility, when we update uid_t, gid_t and company. Exceptions are ino_t and off_t in old libc (though paddings added).
131 lines
2.7 KiB
C
131 lines
2.7 KiB
C
#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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#include <sys/stat.h>
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#include <string.h>
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/* XXX until that st_Xtime macroses used, we have to undefine them,
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* because of minix_prev_stat
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*/
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#undef st_atime
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#undef st_ctime
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#undef st_mtime
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static void prev_stat2new_stat(struct stat *new, struct minix_prev_stat *prev)
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{
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/* Copy field by field because of st_gid type mismath and
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* difference in order after atime.
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*/
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new->st_dev = prev->st_dev;
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new->st_ino = prev->st_ino;
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new->st_mode = prev->st_mode;
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new->st_nlink = prev->st_nlink;
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new->st_uid = prev->st_uid;
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new->st_gid = prev->st_gid;
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new->st_rdev = prev->st_rdev;
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new->st_size = prev->st_size;
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new->st_atimespec.tv_sec = prev->st_atime;
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new->st_mtimespec.tv_sec = prev->st_mtime;
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new->st_ctimespec.tv_sec = prev->st_ctime;
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}
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int _stat(name, buffer)
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const char *name;
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struct stat *buffer;
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{
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message m;
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int r;
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struct minix_prev_stat old_sb;
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m.m1_i1 = strlen(name) + 1;
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m.m1_p1 = (char *) name;
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m.m1_p2 = (char *) buffer;
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if((r = _syscall(VFS_PROC_NR, STAT, &m)) >= 0 || errno != ENOSYS)
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return r;
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errno = 0;
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/* ENOSYS: new binary and old VFS, fallback to PREV_STAT.
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* User has struct stat (buffer), VFS still fills minix_prev_stat.
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*/
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m.m1_i1 = strlen(name) + 1;
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m.m1_p1 = (char *) name;
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m.m1_p2 = (char *) &old_sb;
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if((r = _syscall(VFS_PROC_NR, PREV_STAT, &m)) < 0)
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return r;
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memset(buffer, 0, sizeof(struct stat));
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prev_stat2new_stat(buffer, &old_sb);
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return r;
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}
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int _fstat(fd, buffer)
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int fd;
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struct stat *buffer;
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{
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message m;
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int r;
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struct minix_prev_stat old_sb;
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m.m1_i1 = fd;
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m.m1_p1 = (char *) buffer;
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if((r = _syscall(VFS_PROC_NR, FSTAT, &m)) >= 0 || errno != ENOSYS)
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return r;
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errno = 0;
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/* ENOSYS: new binary and old VFS, fallback to PREV_STAT.
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* User has struct stat (buffer), VFS still fills minix_prev_stat.
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*/
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m.m1_i1 = fd;
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m.m1_p1 = (char *) &old_sb;
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if((r = _syscall(VFS_PROC_NR, PREV_FSTAT, &m)) < 0)
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return r;
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memset(buffer, 0, sizeof(struct stat));
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prev_stat2new_stat(buffer, &old_sb);
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return r;
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}
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int _lstat(name, buffer)
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const char *name;
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struct stat *buffer;
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{
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message m;
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int r;
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struct minix_prev_stat old_sb;
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m.m1_i1 = strlen(name) + 1;
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m.m1_p1 = (char *) name;
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m.m1_p2 = (char *) buffer;
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if((r = _syscall(VFS_PROC_NR, LSTAT, &m)) >= 0 || errno != ENOSYS)
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return r;
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errno = 0;
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/* ENOSYS: new binary and old VFS, fallback to PREV_STAT.
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* User has struct stat (buffer), VFS still fills minix_prev_stat.
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*/
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m.m1_i1 = strlen(name) + 1;
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m.m1_p1 = (char *) name;
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m.m1_p2 = (char *) &old_sb;
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if((r = _syscall(VFS_PROC_NR, PREV_LSTAT, &m)) < 0)
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return r;
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memset(buffer, 0, sizeof(struct stat));
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prev_stat2new_stat(buffer, &old_sb);
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return r;
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}
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