syscall.sh / nios2 / dup
dup
duplicate a file descriptor
sys_dup(unsigned int fildes)| number | 23 (0x17) |
|---|---|
| abi | common |
| entry point | sys_dup |
| since | Linux 3.19 |
| man page | dup(2) |
| source | elixir.bootlin.com |
Registers
| register | value |
|---|---|
r2 | 23, the syscall number |
r4 | unsigned int fildes |
r2 | the return value |
Then run trap to enter the kernel.
Same syscall on other architectures
- x64 32
- x86 41
- arm64 23
- arm 41
- riscv64 23
- x32 1073741856
- loongarch64 23
- ppc64 41
- ppc 41
- s390x 41
- mips64 5031
- mipsn32 6031
- mipso32 4041
- alpha 41
- arc 23
- csky 23
- hexagon 23
- m68k 41
- microblaze 41
- openrisc 23
- parisc 41
- sh 41
- sparc 41
- sparc64 41
- xtensa 10
Get this as JSON: https://api.syscall.sh/v2/syscalls/nios2/dup