1*0Sstevel@tonic-gate /*- 2*0Sstevel@tonic-gate * See the file LICENSE for redistribution information. 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * Copyright (c) 1997, 1998 5*0Sstevel@tonic-gate * Sleepycat Software. All rights reserved. 6*0Sstevel@tonic-gate */ 7*0Sstevel@tonic-gate 8*0Sstevel@tonic-gate #include "config.h" 9*0Sstevel@tonic-gate 10*0Sstevel@tonic-gate #ifndef lint 11*0Sstevel@tonic-gate static const char sccsid[] = "@(#)os_rw.c 10.11 (Sleepycat) 10/12/98"; 12*0Sstevel@tonic-gate #endif /* not lint */ 13*0Sstevel@tonic-gate 14*0Sstevel@tonic-gate #ifndef NO_SYSTEM_INCLUDES 15*0Sstevel@tonic-gate #include <sys/types.h> 16*0Sstevel@tonic-gate 17*0Sstevel@tonic-gate #include <errno.h> 18*0Sstevel@tonic-gate #include <unistd.h> 19*0Sstevel@tonic-gate #endif 20*0Sstevel@tonic-gate 21*0Sstevel@tonic-gate #include "db_int.h" 22*0Sstevel@tonic-gate #include "os_jump.h" 23*0Sstevel@tonic-gate 24*0Sstevel@tonic-gate /* 25*0Sstevel@tonic-gate * __os_io -- 26*0Sstevel@tonic-gate * Do an I/O. 27*0Sstevel@tonic-gate * 28*0Sstevel@tonic-gate * PUBLIC: int __os_io __P((DB_IO *, int, ssize_t *)); 29*0Sstevel@tonic-gate */ 30*0Sstevel@tonic-gate int 31*0Sstevel@tonic-gate __os_io(db_iop, op, niop) 32*0Sstevel@tonic-gate DB_IO *db_iop; 33*0Sstevel@tonic-gate int op; 34*0Sstevel@tonic-gate ssize_t *niop; 35*0Sstevel@tonic-gate { 36*0Sstevel@tonic-gate int ret; 37*0Sstevel@tonic-gate 38*0Sstevel@tonic-gate #ifdef HAVE_PREAD 39*0Sstevel@tonic-gate switch (op) { 40*0Sstevel@tonic-gate case DB_IO_READ: 41*0Sstevel@tonic-gate if (__db_jump.j_read != NULL) 42*0Sstevel@tonic-gate goto slow; 43*0Sstevel@tonic-gate *niop = pread(db_iop->fd_io, db_iop->buf, 44*0Sstevel@tonic-gate db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize); 45*0Sstevel@tonic-gate break; 46*0Sstevel@tonic-gate case DB_IO_WRITE: 47*0Sstevel@tonic-gate if (__db_jump.j_write != NULL) 48*0Sstevel@tonic-gate goto slow; 49*0Sstevel@tonic-gate *niop = pwrite(db_iop->fd_io, db_iop->buf, 50*0Sstevel@tonic-gate db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize); 51*0Sstevel@tonic-gate break; 52*0Sstevel@tonic-gate } 53*0Sstevel@tonic-gate if (*niop == db_iop->bytes) 54*0Sstevel@tonic-gate return (0); 55*0Sstevel@tonic-gate slow: 56*0Sstevel@tonic-gate #endif 57*0Sstevel@tonic-gate if (db_iop->mutexp != NULL) 58*0Sstevel@tonic-gate (void)__db_mutex_lock(db_iop->mutexp, db_iop->fd_lock); 59*0Sstevel@tonic-gate 60*0Sstevel@tonic-gate if ((ret = __os_seek(db_iop->fd_io, 61*0Sstevel@tonic-gate db_iop->pagesize, db_iop->pgno, 0, 0, SEEK_SET)) != 0) 62*0Sstevel@tonic-gate goto err; 63*0Sstevel@tonic-gate switch (op) { 64*0Sstevel@tonic-gate case DB_IO_READ: 65*0Sstevel@tonic-gate ret = 66*0Sstevel@tonic-gate __os_read(db_iop->fd_io, db_iop->buf, db_iop->bytes, niop); 67*0Sstevel@tonic-gate break; 68*0Sstevel@tonic-gate case DB_IO_WRITE: 69*0Sstevel@tonic-gate ret = 70*0Sstevel@tonic-gate __os_write(db_iop->fd_io, db_iop->buf, db_iop->bytes, niop); 71*0Sstevel@tonic-gate break; 72*0Sstevel@tonic-gate } 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate err: if (db_iop->mutexp != NULL) 75*0Sstevel@tonic-gate (void)__db_mutex_unlock(db_iop->mutexp, db_iop->fd_lock); 76*0Sstevel@tonic-gate 77*0Sstevel@tonic-gate return (ret); 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate } 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate /* 82*0Sstevel@tonic-gate * __os_read -- 83*0Sstevel@tonic-gate * Read from a file handle. 84*0Sstevel@tonic-gate * 85*0Sstevel@tonic-gate * PUBLIC: int __os_read __P((int, void *, size_t, ssize_t *)); 86*0Sstevel@tonic-gate */ 87*0Sstevel@tonic-gate int 88*0Sstevel@tonic-gate __os_read(fd, addr, len, nrp) 89*0Sstevel@tonic-gate int fd; 90*0Sstevel@tonic-gate void *addr; 91*0Sstevel@tonic-gate size_t len; 92*0Sstevel@tonic-gate ssize_t *nrp; 93*0Sstevel@tonic-gate { 94*0Sstevel@tonic-gate size_t offset; 95*0Sstevel@tonic-gate ssize_t nr; 96*0Sstevel@tonic-gate u_int8_t *taddr; 97*0Sstevel@tonic-gate 98*0Sstevel@tonic-gate for (taddr = addr, 99*0Sstevel@tonic-gate offset = 0; offset < len; taddr += nr, offset += nr) { 100*0Sstevel@tonic-gate if ((nr = __db_jump.j_read != NULL ? 101*0Sstevel@tonic-gate __db_jump.j_read(fd, taddr, len - offset) : 102*0Sstevel@tonic-gate read(fd, taddr, len - offset)) < 0) 103*0Sstevel@tonic-gate return (errno); 104*0Sstevel@tonic-gate if (nr == 0) 105*0Sstevel@tonic-gate break; 106*0Sstevel@tonic-gate } 107*0Sstevel@tonic-gate *nrp = taddr - (u_int8_t *)addr; 108*0Sstevel@tonic-gate return (0); 109*0Sstevel@tonic-gate } 110*0Sstevel@tonic-gate 111*0Sstevel@tonic-gate /* 112*0Sstevel@tonic-gate * __os_write -- 113*0Sstevel@tonic-gate * Write to a file handle. 114*0Sstevel@tonic-gate * 115*0Sstevel@tonic-gate * PUBLIC: int __os_write __P((int, void *, size_t, ssize_t *)); 116*0Sstevel@tonic-gate */ 117*0Sstevel@tonic-gate int 118*0Sstevel@tonic-gate __os_write(fd, addr, len, nwp) 119*0Sstevel@tonic-gate int fd; 120*0Sstevel@tonic-gate void *addr; 121*0Sstevel@tonic-gate size_t len; 122*0Sstevel@tonic-gate ssize_t *nwp; 123*0Sstevel@tonic-gate { 124*0Sstevel@tonic-gate size_t offset; 125*0Sstevel@tonic-gate ssize_t nw; 126*0Sstevel@tonic-gate u_int8_t *taddr; 127*0Sstevel@tonic-gate 128*0Sstevel@tonic-gate for (taddr = addr, 129*0Sstevel@tonic-gate offset = 0; offset < len; taddr += nw, offset += nw) 130*0Sstevel@tonic-gate if ((nw = __db_jump.j_write != NULL ? 131*0Sstevel@tonic-gate __db_jump.j_write(fd, taddr, len - offset) : 132*0Sstevel@tonic-gate write(fd, taddr, len - offset)) < 0) 133*0Sstevel@tonic-gate return (errno); 134*0Sstevel@tonic-gate *nwp = len; 135*0Sstevel@tonic-gate return (0); 136*0Sstevel@tonic-gate } 137