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Kernel+Userland: Implement mknod() syscall and add a /bin/mknod program.
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15 changed files with 107 additions and 14 deletions
50
Userland/mknod.cpp
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50
Userland/mknod.cpp
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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inline constexpr unsigned encoded_device(unsigned major, unsigned minor)
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{
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return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
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}
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static int usage()
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{
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printf("usage: mknod <name> <c|b|p> <major> <minor>\n");
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return 0;
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}
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int main(int argc, char** argv)
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{
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// FIXME: When invoked with type "p", no need for major/minor numbers.
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// FIXME: Add some kind of option for specifying the file permissions.
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if (argc != 5)
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return usage();
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const char* name = argv[1];
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mode_t mode = 0666;
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switch (argv[2][0]) {
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case 'c':
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case 'u':
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mode |= S_IFCHR;
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break;
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case 'b':
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mode |= S_IFBLK;
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break;
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case 'p':
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mode |= S_IFIFO;
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break;
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default:
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return usage();
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}
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int major = atoi(argv[3]);
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int minor = atoi(argv[4]);
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int rc = mknod(name, mode, encoded_device(major, minor));
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if (rc < 0) {
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perror("mknod");
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return 1;
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}
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return 0;
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}
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