minix3/lib/libc/sys/open.c

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2020-02-21 00:59:27 +05:30
#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
int open(const char *name, int flags, ...)
{
va_list argp;
message m;
int call;
memset(&m, 0, sizeof(m));
va_start(argp, flags);
/* Depending on whether O_CREAT is set, a different message layout is used,
* and therefore a different call number as well.
*/
if (flags & O_CREAT) {
m.m_lc_vfs_creat.len = strlen(name) + 1;
m.m_lc_vfs_creat.flags = flags;
m.m_lc_vfs_creat.mode = va_arg(argp, mode_t);
m.m_lc_vfs_creat.name = (vir_bytes)name;
call = VFS_CREAT;
} else {
_loadname(name, &m);
m.m_lc_vfs_path.flags = flags;
call = VFS_OPEN;
}
va_end(argp);
return (_syscall(VFS_PROC_NR, call, &m));
}