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Diffstat (limited to '')
| -rw-r--r-- | snippets/fileHandling.s | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/snippets/fileHandling.s b/snippets/fileHandling.s new file mode 100644 index 0000000..17a9428 --- /dev/null +++ b/snippets/fileHandling.s @@ -0,0 +1,16 @@ +# int getFileSize(int fd) +# +# Returns the size (in bytes) of the file indicated by the file descriptor. +.section .data +.Lstat: .space 144 # size of the fstat struct +.section .text +.globl getFileSize +.type getFileSize, @function +getFileSize: + movq $5, %rax # fstat + # rdi already contains the fd + movq $.Lstat, %rsi # buffer to write fstat data into + syscall + movq $.Lstat, %rax + movq 48(%rax), %rax # position of size in the struct + ret |