diff options
| -rw-r--r-- | 4init/config.h | 2 | ||||
| -rwxr-xr-x | 4rc/4rc | bin | 17872 -> 17872 bytes | |||
| -rw-r--r-- | 4rc/4rc.c | 76 | ||||
| -rw-r--r-- | 4rc/README.md | 6 |
4 files changed, 69 insertions, 15 deletions
diff --git a/4init/config.h b/4init/config.h index 3798447..2ff1d6d 100644 --- a/4init/config.h +++ b/4init/config.h @@ -1,7 +1,7 @@ #ifndef CONFIG_H #define CONFIG_H -static const char *rc_path = "/usr/bin/4rc"; +static const char *rc_path = "/usr/local/bin/4rc"; static char *const rc_argv[] = {"4rc", NULL}; @@ -1,36 +1,52 @@ +#define _DEFAULT_SOURCE #define _POSIX_C_SOURCE 200809L +#include <errno.h> +#include <fcntl.h> #include <stdio.h> +#include <string.h> #include <sys/mount.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> void create_vfs(void) { - mkdir("/proc", 0755); - mkdir("/sys", 0755); - mkdir("/dev", 0755); - mkdir("/run", 0755); + if (mkdir("/proc", 0755) != 0 && errno != EEXIST) { + perror("proc"); + } + if (mkdir("/sys", 0755) != 0 && errno != EEXIST) { + perror("sys"); + } + if (mkdir("/dev", 0755) != 0 && errno != EEXIST) { + perror("dev"); + } + if (mkdir("/run", 0755) != 0 && errno != EEXIST) { + perror("run"); + } } void mount_vfs(void) { if (mount("proc", "/proc", "proc", - MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_RELATIME, NULL) != 0) { + MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_RELATIME, NULL) != 0 && + errno != EBUSY) { perror("mount /proc"); } if (mount("sys", "/sys", "sysfs", - MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_RELATIME, NULL) != 0) { + MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_RELATIME, NULL) != 0 && + errno != EBUSY) { perror("mount /sys"); } if (mount("dev", "/dev", "devtmpfs", MS_NOSUID | MS_RELATIME, "mode=755") != - 0) { + 0 && + errno != EBUSY) { perror("mount /dev"); } if (mount("run", "/run", "tmpfs", MS_NOSUID | MS_NODEV | MS_RELATIME, - "mode=755") != 0) { + "mode=755") != 0 && + errno != EBUSY) { perror("mount /run"); } @@ -38,19 +54,59 @@ void mount_vfs(void) { mkdir("/dev/shm", 1777); if (mount("devpts", "/dev/pts", "devpts", - MS_NOSUID | MS_NOEXEC | MS_RELATIME, "gid=5,mode=620") != 0) { + MS_NOSUID | MS_NOEXEC | MS_RELATIME, "gid=5,mode=620") != 0 && + errno != EBUSY) { perror("mount /dev/pts"); } if (mount("shm", "/dev/shm", "tmpfs", MS_NOSUID | MS_NODEV | MS_RELATIME, - "mode=1777") != 0) { + "mode=1777") != 0 && + errno != EBUSY) { perror("mount /dev/shm"); } } +void set_hostname(void) { + char buf[256]; + int fd = open("/etc/hostname", O_RDONLY); + + if (fd < 0) { + perror("open /etc/hostname"); + return; + } + + ssize_t bytes_read = read(fd, buf, sizeof(buf) - 1); + close(fd); + + if (bytes_read > 0) { + buf[bytes_read] = '\0'; + size_t len = strcspn(buf, "\r\n "); + buf[len] = '\0'; + + if (sethostname(buf, len) != 0) { + perror("sethostname"); + } + } +} + int main(void) { create_vfs(); mount_vfs(); + int fd = open("/dev/console", O_RDWR); + + if (fd >= 0) { + dup2(fd, 0); + dup2(fd, 1); + dup2(fd, 2); + if (fd > 2) { + close(fd); + } + } else { + perror("console"); + } + + set_hostname(); + return 0; } diff --git a/4rc/README.md b/4rc/README.md index 44fbde5..9309fc9 100644 --- a/4rc/README.md +++ b/4rc/README.md @@ -1,5 +1,3 @@ -# 4init: minimal but functional init +# 4rc: service manager that larps as being functional -It's only purpose is to manage processes, it by defaults calls 4rc, but you can change that in `config.h`, it's started as PID 1, and if it crashes, the kernel will panic, read the article in Wikipedia if you want to know more. - -Inspired by [rofl0r](https://gist.github.com/rofl0r/6168719)'s minimal init.
\ No newline at end of file +service manager, not much else to explain other for now.. |