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syscall: support pread, pwrite

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This commit is contained in:
K. Lange 2024-02-08 16:48:25 +09:00
parent 8ce8d8d397
commit b96c18b508
2 changed files with 28 additions and 0 deletions
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2
base/usr/include/syscall_nums.h
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@ -80,3 +80,5 @@
#define SYS_SIGWAIT 77
#define SYS_GETSOCKNAME 78
#define SYS_GETPEERNAME 79
#define SYS_PREAD 80
#define SYS_PWRITE 81

26
kernel/sys/syscall.c
View File

@ -240,6 +240,30 @@ long sys_write(int fd, char * ptr, unsigned long len) {
return -EBADF;
}
long sys_pwrite(int fd, void * ptr, size_t count, off_t offset) {
if (FD_CHECK(fd)) {
if ((FD_ENTRY(fd)->flags & FS_PIPE) || (FD_ENTRY(fd)->flags & FS_CHARDEVICE) || (FD_ENTRY(fd)->flags & FS_SOCKET)) return -ESPIPE;
PTRCHECK(ptr,count,MMU_PTR_NULL);
fs_node_t * node = FD_ENTRY(fd);
if (!(FD_MODE(fd) & 2)) return -EACCES;
if (count && !ptr) return -EFAULT;
return write_fs(node, offset, count, (uint8_t*)ptr);
}
return -EBADF;
}
long sys_pread(int fd, void * ptr, size_t count, off_t offset) {
if (FD_CHECK(fd)) {
if ((FD_ENTRY(fd)->flags & FS_PIPE) || (FD_ENTRY(fd)->flags & FS_CHARDEVICE) || (FD_ENTRY(fd)->flags & FS_SOCKET)) return -ESPIPE;
PTRCHECK(ptr,count,MMU_PTR_NULL|MMU_PTR_WRITE);
fs_node_t * node = FD_ENTRY(fd);
if (!(FD_MODE(fd) & 01)) return -EACCES;
if (count && !ptr) return -EFAULT;
return read_fs(node, offset, count, (uint8_t *)ptr);
}
return -EBADF;
}
static long stat_node(fs_node_t * fn, uintptr_t st) {
struct stat * f = (struct stat *)st;
@ -1239,6 +1263,8 @@ static scall_func syscalls[] = {
[SYS_SIGPROCMASK] = (scall_func)(uintptr_t)sys_sigprocmask,
[SYS_SIGSUSPEND] = (scall_func)(uintptr_t)sys_sigsuspend_cur,
[SYS_SIGWAIT] = (scall_func)(uintptr_t)sys_sigwait,
[SYS_PREAD] = (scall_func)(uintptr_t)sys_pread,
[SYS_PWRITE] = (scall_func)(uintptr_t)sys_pwrite,
[SYS_SOCKET] = (scall_func)(uintptr_t)net_socket,
[SYS_SETSOCKOPT] = (scall_func)(uintptr_t)net_setsockopt,