diff options
Diffstat (limited to '05/musl-0.6.0/src/unistd/ttyname_r.c')
-rw-r--r-- | 05/musl-0.6.0/src/unistd/ttyname_r.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/05/musl-0.6.0/src/unistd/ttyname_r.c b/05/musl-0.6.0/src/unistd/ttyname_r.c new file mode 100644 index 0000000..f86fbd9 --- /dev/null +++ b/05/musl-0.6.0/src/unistd/ttyname_r.c @@ -0,0 +1,19 @@ +#include <unistd.h> +#include <errno.h> +#include <stdio.h> +#include <string.h> + +int ttyname_r(int fd, char *name, size_t size) +{ + char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2]; + ssize_t l; + + if (!isatty(fd)) return ENOTTY; + + snprintf(procname, sizeof procname, "/proc/self/fd/%d", fd); + l = readlink(procname, name, size); + + if (l < 0) return errno; + else if (l == size) return ERANGE; + else return 0; +} |