Proc - maps file

The /proc/PID/maps file containing the currently mapped memory regions and their access permissions.

The format is:

address	perms	offset	dev	inode	pathname
08048000-08049000	r-xp	00000000	03:00	8312	/opt/test
08049000-0804a000	rw-p	00001000	03:00	8312	/opt/test
0804a000-0806b000	rw-p	00000000	00:00	0	[heap]
a7cb1000-a7cb2000	---p	00000000	00:00	0
a7cb2000-a7eb2000	rw-p	00000000	00:00	0
a7eb2000-a7eb3000	---p	00000000	00:00	0
a7eb3000-a7ed5000	rw-p	00000000	00:00	0
a7ed5000-a8008000	r-xp	00000000	03:00	4222	/lib/libc.so.6
a8008000-a800a000	r--p	00133000	03:00	4222	/lib/libc.so.6
a800a000-a800b000	rw-p	00135000	03:00	4222	/lib/libc.so.6
a800b000-a800e000	rw-p	00000000	00:00	0
a800e000-a8022000	r-xp	00000000	03:00	14462	/lib/libpthread.so.0
a8022000-a8023000	r--p	00013000	03:00	14462	/lib/libpthread.so.0
a8023000-a8024000	rw-p	00014000	03:00	14462	/lib/libpthread.so.0
a8024000-a8027000	rw-p	00000000	00:00	0
a8027000-a8043000	r-xp	00000000	03:00	8317	/lib/ld-linux.so.2
a8043000-a8044000	r--p	0001b000	03:00	8317	/lib/ld-linux.so.2
a8044000-a8045000	rw-p	0001c000	03:00	8317	/lib/ld-linux.so.2
aff35000-aff4a000	rw-p	00000000	00:00	0	[stack]
ffffe000-fffff000	r-xp	00000000	00:00	0	[vdso]

where:

address is the address space in the process that it occupies.
perms is a set of permissions:
- r = read.
- w = write.
- x = execute.
- s = shared.
- p = private (copy on write).
offset is the offset into the mapping.
dev is the device (major:minor).
inode is the inode on that device.
- 0 indicates that no inode is associated with the memory region, as the case would be with BSS (uninitialized data).
pathname shows the name associated file for this mapping. If the mapping is not associated with a file:
- [heap] = the heap of the program.
- [stack] = the stack of the main process.
- [vdso] = the “virtual dynamic shared object”, the kernel system call handler.
- If empty, the mapping is anonymous.