d1bf69ce0d
Sysfs: - New VFS driver mounted at /sys that lets kernel drivers expose virtual text files via namespace registration - Drivers call sysfs_register(name, ops, ctx) with list/read/write callbacks for their namespace - IDE driver registers 'ide' namespace exposing per-device attributes: model, type, channel, drive, sectors, sector_size - Tested: ls /sys -> ide, ls /sys/ide -> hdd1 cd1, cat /sys/ide/hdd1/model -> QEMU HARDDISK Syscalls: - Added SYS_OPEN (11) and SYS_CLOSE (12) for file I/O from userspace - Extended SYS_READ/SYS_WRITE to handle VFS file descriptors (fd >= 3) - Updated userspace syscalls.h with open()/close() wrappers Apps: - New 'cat' app: reads and displays file contents via open/read/close - Updated 'ls' to accept path argument via ARG1 env var - Updated shell to pass ARG1 env var to external commands
39 lines
877 B
C
39 lines
877 B
C
/**
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* @file ls.c
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* @brief List directory contents.
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*
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* Lists entries in the current working directory (from the CWD
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* environment variable). Uses the SYS_READDIR syscall to enumerate
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* directory entries.
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*/
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#include "syscalls.h"
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int main(void) {
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/* Check for an explicit path argument first */
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char cwd[128];
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if (getenv("ARG1", cwd, sizeof(cwd)) < 0 || cwd[0] == '\0') {
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/* No argument; use the current working directory */
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if (getenv("CWD", cwd, sizeof(cwd)) < 0) {
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cwd[0] = '/';
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cwd[1] = '\0';
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}
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}
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char name[128];
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uint32_t idx = 0;
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int32_t type;
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while ((type = readdir(cwd, idx, name)) >= 0) {
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puts(name);
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if (type == 2) {
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/* Directory: append / indicator */
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putchar('/');
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}
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putchar('\n');
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idx++;
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}
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return 0;
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}
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