diff options
| -rw-r--r-- | toys/mountpoint.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/toys/mountpoint.c b/toys/mountpoint.c new file mode 100644 index 00000000..405bb3a5 --- /dev/null +++ b/toys/mountpoint.c @@ -0,0 +1,56 @@ +/* vi: set sw=4 ts=4: + * + * mountpoint.c - Check if a directory is a mountpoint. + * + * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com> + * + * Not in SUSv4. + +USE_MOUNTPOINT(NEWTOY(mountpoint, "<1qdx", TOYFLAG_BIN)) + +config MOUNTPOINT + bool "mountpoint" + default y + help + usage: mountpoint [-q] [-d] directory + mountpoint [-q] [-x] device + -q Be quiet, return zero if directory is a mountpoint + -d Print major/minor device number of the directory + -x Print major/minor device number of the block device +*/ + +#include "toys.h" + +void mountpoint_main(void) +{ + struct stat st1, st2; + int res = 0; + int quiet = toys.optflags & 0x4; + toys.exitval = 1; // be pessimistic + strncpy(toybuf, toys.optargs[0], sizeof(toybuf)); + if (((toys.optflags & 0x1) && lstat(toybuf, &st1)) || stat(toybuf, &st1)) + perror_exit("%s", toybuf); + + if (toys.optflags & 0x1){ + if (S_ISBLK(st1.st_mode)) { + if (!quiet) printf("%u:%u\n", major(st1.st_rdev), minor(st1.st_rdev)); + toys.exitval = 0; + return; + } + if (!quiet) printf("%s: not a block device\n", toybuf); + return; + } + + if(!S_ISDIR(st1.st_mode)){ + if (!quiet) printf("%s: not a directory\n", toybuf); + return; + } + strncat(toybuf, "/..", sizeof(toybuf)); + stat(toybuf, &st2); + res = (st1.st_dev != st2.st_dev) || + (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino); + if (!quiet) printf("%s is %sa mountpoint\n", toys.optargs[0], res ? "" : "not "); + if (toys.optflags & 0x2) + printf("%u:%u\n", major(st1.st_dev), minor(st1.st_dev)); + toys.exitval = res ? 0 : 1; +} |