add strict option for pidof

Author: jiacai2050

docs/content/programs/pidof.org

@@ -1,8 +1,10 @@
 #+TITLE: pidof
 #+DATE: 2024-08-17T17:52:44+0800
-#+LASTMOD: 2024-09-01T11:56:51+0800
+#+LASTMOD: 2024-10-30T21:53:30+0800
 #+TYPE: docs
-#+DESCRIPTION: Linux has this command, but not macOS, so I write it for you.
+#+DESCRIPTION: Linux has this command, but not in macOS, so I write it for you.
+
+Program name is case insensitive by default, pass =-S= option if you want sensitive match.
 
 #+begin_src bash :results verbatim :exports results :wrap example :dir ../../..
 ./zig-out/bin/pidof -h
@@ -14,9 +16,10 @@
      ./zig-out/bin/pidof [OPTIONS] [--] [program]
 
  OPTIONS:
-	-s, --single                      Single shot - this instructs the program to only return one pid.
-	-S, --separator STRING            Use separator as a separator put between pids.(default:  )
-	-u, --user_only                   Only show process belonging to current user.
-	-v, --version                     Print version.
-	-h, --help                        Print help message.
+  -s, --single                     Only return the first matching pid.
+  -d, --delimiter STRING           Delimiter used if more than one PID is shown.(default:  )
+  -S, --strict                     Case sensitive when matching program name.
+  -u, --user_only                  Only show process belonging to current user.
+  -v, --version                    Print version.
+  -h, --help                       Print help message.
 #+end_example

src/bin/pidof.zig

@@ -12,45 +12,49 @@ const c = @cImport({
 
 pub const Options = struct {
     single: bool = false,
-    separator: []const u8 = " ",
+    delimiter: []const u8 = " ",
+    strict: bool = false,
     user_only: bool = false,
     version: bool = false,
     help: bool = false,
 
     pub const __shorts__ = .{
         .single = .s,
-        .separator = .S,
+        .delimiter = .d,
+        .strict = .S,
         .user_only = .u,
         .version = .v,
         .help = .h,
     };
     pub const __messages__ = .{
-        .single = "Single shot - this instructs the program to only return one pid.",
-        .separator = "Use separator as a separator put between pids.",
+        .single = "Only return the first matching pid.",
+        .delimiter = "Delimiter used if more than one PID is shown.",
+        .strict = "Case sensitive when matching program name.",
         .user_only = "Only show process belonging to current user.",
         .version = "Print version.",
         .help = "Print help message.",
     };
 };
 
-pub fn findPids(allocator: std.mem.Allocator, opt: Options, program: []const u8) !std.ArrayList(c.pid_t) {
+pub fn searchPids(allocator: std.mem.Allocator, opt: Options, program: []const u8) !std.ArrayList(c.pid_t) {
     var mib = [_]c_int{
         c.CTL_KERN,
         c.KERN_PROC,
         c.KERN_PROC_ALL,
     };
     var procSize: usize = 0;
+    // sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen);
     var rc = c.sysctl(&mib, mib.len, null, &procSize, null, 0);
     if (rc != 0) {
-        std.debug.print("get proc size, err:{any}", .{std.posix.errno(rc)});
+        std.log.err("get proc size, err:{any}", .{std.posix.errno(rc)});
         return error.sysctl;
     }
 
     const procList = try allocator.alloc(c.struct_kinfo_proc, procSize / @sizeOf(c.struct_kinfo_proc));
     // https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/sysctl.3.html
     rc = c.sysctl(&mib, mib.len, @ptrCast(procList), &procSize, null, 0);
     if (rc != 0) {
-        std.debug.print("get proc list failed, err:{any}", .{std.posix.errno(rc)});
+        std.log.err("get proc list failed, err:{any}", .{std.posix.errno(rc)});
         return error.sysctl;
     }
 
@@ -69,10 +73,13 @@ pub fn findPids(allocator: std.mem.Allocator, opt: Options, program: []const u8)
             }
         }
 
-        // p_comm is [17]u8
         const name = std.mem.sliceTo(&proc.kp_proc.p_comm, 0);
-        if (program.len >= name.len) {
-            if (std.mem.eql(u8, name, program[0..name.len])) {
+        if (opt.strict) {
+            if (std.mem.eql(u8, name, program)) {
+                try pids.append(proc.kp_proc.p_pid);
+            }
+        } else {
+            if (std.ascii.eqlIgnoreCase(name, program)) {
                 try pids.append(proc.kp_proc.p_pid);
             }
         }
@@ -90,21 +97,20 @@ pub fn main() !void {
     defer opt.deinit();
 
     if (opt.positional_args.len == 0) {
-        std.debug.print("program is not given", .{});
+        std.log.err("program is not given", .{});
         std.posix.exit(1);
     }
 
     const program = opt.positional_args[0];
-
-    const pids = try findPids(allocator, opt.args, program);
+    const pids = try searchPids(allocator, opt.args, program);
     if (pids.items.len == 0) {
         std.posix.exit(1);
     }
 
     var stdout = std.io.getStdOut().writer();
     for (pids.items, 0..) |pid, i| {
         if (i > 0) {
-            try stdout.writeAll(opt.args.separator);
+            try stdout.writeAll(opt.args.delimiter);
         }
         try stdout.print("{d}", .{pid});
     }