source: azure_iot_hub/trunk/musl-1.1.18/src/stdio/fopen.c@ 388

#include "stdio_impl.h"
#include <fcntl.h>
#include <string.h>
#include <errno.h>

FILE *fopen(const char *restrict filename, const char *restrict mode)
{
        FILE *f;
        int fd;
        int flags;

        /* Check for valid initial mode character */
        if (!strchr("rwa", *mode)) {
                errno = EINVAL;
                return 0;
        }

        /* Compute the flags to pass to open() */
        flags = __fmodeflags(mode);

        fd = sys_open(filename, flags, 0666);
        if (fd < 0) return 0;
        if (flags & O_CLOEXEC)
                __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);

        f = __fdopen(fd, mode);
        if (f) return f;

        __syscall(SYS_close, fd);
        return 0;
}

LFS64(fopen);