bore

commit 05429c0040ad1a642daca41782338ea751638764
parent 86b483dfb27ad3bb5e32a55e79e92424d2e9e57b
Author: phoebos <ben@bvnf.space>
Date:   Thu, 10 Mar 2022 03:27:03 +0000

nice: add

Diffstat:
M
Makefile
 | 
1
+
M
PROGRESS
 | 
1
+
M
TODO.posix
 | 
2
+-
A
nice.c
 | 
34
++++++++++++++++++++++++++++++++++

4 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
@@ -9,6 +9,7 @@ BINS = \
 	head \
 	ls \
 	mkdir \
+	nice \
 	pwd \
 	rmdir \
 	sort \
diff --git a/PROGRESS b/PROGRESS
@@ -26,6 +26,7 @@
 [ ] mkdir
 [ ] more
 [ ] mv
+[x] nice [-n]
 [ ] nl
 [ ] printf
 [ ] ps
diff --git a/TODO.posix b/TODO.posix
@@ -70,7 +70,7 @@
 [ ] more
 [ ] mv
 [ ] newgrp
-[ ] nice
+[x] nice
 [ ] nl
 [ ] nm
 [ ] nohup
diff --git a/nice.c b/nice.c
@@ -0,0 +1,34 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int
+main(int argc, char **argv) {
+    int n = 10;
+    if (argc > 3 && strcmp("-n", argv[1]) == 0) {
+        n = atoi(argv[2]);
+        argv += 2;
+        argc -= 2;
+    }
+
+    if (argc == 1) {
+        fprintf(stderr, "usage: nice [-n increment] utility [args]\n");
+        return 1;
+    }
+
+    errno = 0;
+    if (nice(n) == -1 && errno) {
+        perror("nice");
+    }
+
+    errno = 0;
+    execvp(argv[1], argv + 1);
+
+    if (errno) {
+        perror(argv[1]);
+        return 127;
+    }
+    return 126;
+}