apio
da2ede3450
Kernel: Implement a descriptor struct which stores the opened node and read offset, and give each task 8 of those. Implement three syscalls: sys_read, sys_open and sys_close (sys_write still writes to the console instead of using a fd, for now) Implement three new errors: ENOENT, EBADF and EMFILE. libc: Implement the new errors, and the new syscalls in syscall(). Also fix _RETURN_WITH_ERRNO() to set errno correctly, which was making strerror() return null, thus crashing perror(). userspace: make init demonstrate the new file API.
69 lines
1.2 KiB
C
69 lines
1.2 KiB
C
#include <luna.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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typedef long ssize_t;
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int main()
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{
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if (gettid() == 0) // why are we the idle task?
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{
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__luna_abort("SHENANIGANS! init is tid 0 (which is reserved for the idle task)\n");
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}
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printf("Welcome to Luna!\n");
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printf("Running as tid %ld\n\n", gettid());
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sleep(1);
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char version[40];
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syscall(SYS_getversion, version, sizeof(version));
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printf("Your kernel version is %s\n\n", version);
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sleep(2);
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const char* filename = "/sys/config";
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printf("Opening %s for reading...\n", filename);
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int fd = syscall(SYS_open, filename, 1);
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if (fd < 0)
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{
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perror("open");
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// return 1;
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}
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else { printf("Got fd %d\n", fd); }
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char buf[4096];
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ssize_t nread = syscall(SYS_read, fd, sizeof(buf), buf);
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if (nread < 0)
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{
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perror("read");
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// return 1;
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}
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else
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{
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buf[nread] = 0;
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printf("Read %zd bytes\n\n", nread);
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printf("%s", buf);
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}
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if (syscall(SYS_close, fd) < 0)
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{
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perror("close");
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// return 1;
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}
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printf("\n\nPress any key to restart.\n");
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return 0;
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}
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