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| author | rtm <rtm> | 2006-07-29 09:35:02 +0000 |
|---|---|---|
| committer | rtm <rtm> | 2006-07-29 09:35:02 +0000 |
| commit | 32630628a996e29018641af262272339ed6fef88 (patch) | |
| tree | 73c9a7dee75f96c0ce0e9c804d379dd60bf254b4 /syscall.c | |
| parent | e46fb46fcf4302bf5ed913101c5c7b510fe03ad4 (diff) | |
| download | xv6-labs-32630628a996e29018641af262272339ed6fef88.tar.gz xv6-labs-32630628a996e29018641af262272339ed6fef88.tar.bz2 xv6-labs-32630628a996e29018641af262272339ed6fef88.zip | |
open()
Diffstat (limited to 'syscall.c')
| -rw-r--r-- | syscall.c | 39 |
1 files changed, 39 insertions, 0 deletions
@@ -11,6 +11,7 @@ #include "fs.h" #include "fsvar.h" #include "elf.h" +#include "fd.h" /* * User code makes a system call with INT T_SYSCALL. @@ -244,6 +245,41 @@ sys_cons_puts(void) } int +sys_open(void) +{ + struct proc *cp = curproc[cpu()]; + struct inode *ip; + uint arg0, arg1; + int ufd; + struct fd *fd; + + if(fetcharg(0, &arg0) < 0 || fetcharg(1, &arg1) < 0) + return -1; + if(checkstring(arg0) < 0) + return -1; + if((ip = namei(cp->mem + arg0)) == 0) + return -1; + if((fd = fd_alloc()) == 0){ + iput(ip); + return -1; + } + if((ufd = fd_ualloc()) < 0){ + iput(ip); + fd_close(fd); + return -1; + } + + iunlock(ip); + fd->type = FD_FILE; + fd->readable = 1; + fd->writeable = 0; + fd->ip = ip; + cp->fds[ufd] = fd; + + return ufd; +} + +int sys_exec(void) { struct proc *cp = curproc[cpu()]; @@ -467,6 +503,9 @@ syscall(void) case SYS_exec: ret = sys_exec(); break; + case SYS_open: + ret = sys_open(); + break; default: cprintf("unknown sys call %d\n", num); // XXX fault |