Makefile

@@ -32,7 +32,7 @@ RUSTLIBS = --extern getopt=build/o/libgetopt.rlib \
 CFLAGS += -I$(SYSEXITS)
 
 .PHONY: all
-all: dj false fop hru intcmp mm npc rpn simexec scrut str strcmp swab true
+all: dj false fop hru intcmp mm npc rpn scrut str strcmp swab true
 
 # keep build/include until bindgen(1) has stdin support
 # https://github.com/rust-lang/rust-bindgen/issues/2703
@@ -132,11 +132,6 @@ scrut: build/bin/scrut
 build/bin/scrut: src/scrut.c build
 	$(CC) $(CFLAGS) -o $@ src/scrut.c
 
-.PHONY: simexec
-simexec: build/bin/simexec
-build/bin/simexec: src/simexec.c build
-	$(CC) $(CFLAGS) -o $@ src/simexec.c
-
 .PHONY: str
 str: build/bin/str
 build/bin/str: src/str.c build

docs/simexec.1

@@ -1,79 +1,49 @@
-.\" Copyright (c) 2022–2024 DTB <trinity@trinity.moe>
+.TH SIMEXEC 1
-.\"
+
-.\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
-.\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
-.\"
-.TH SIMEXEC 1 2024-07-23 "Harakit-overgrown X.X.X"
 .SH NAME
-simexec \(en execute a program with argv
+
-.\"
+simexec \(en execute a program with the given argv
+
 .SH SYNOPSIS
 
 simexec
-.B binary argv...
+.RB [ pathname ]
+.RB [ argv... ]
+
 .SH DESCRIPTION
-Execute a binary with a certain argv.
-.SH CAVEATS
 
-Non-binary programs cannot be executed on their own. The PATH environment
+Simexec executes a given program with the given argv.
-variable is not used and a valid pathname (relative or absolute) must be
-specified.
 
-.BR simexec (1)
+.SH PITFALLS
-requires caution.
-.B argv
-are not just the operands for the binary but in fact the direct
-.B argv
-it will receive in runtime;
-the first argv entry is the program\(cqs name, and omitting this, though valid
-use of
-.BR simexec (1),
-can break false assumptions made by programmers.
-for example, the
-.BR true (1)
-implementation in the GNU coreutils project suffers a segmentation fault it is
-given no argv[0].
 
-While POSIX.1-2017 doesn't mandate there being an argv[0] per se, a Strictly
+Non-binary programs cannot be executed. The PATH environment variable is not used and a valid pathname (relative or absolute) must be specified.
-Conforming POSIX Application must pass an argv[0]. It has also been said that
+.PP
-those who do not pass an argv[0] are mean and nasty and smell of elderberries.
+Simexec relies on the user to take proper precautions.
+argv is not just the operands for the program but in fact directly the argv it will receive in runtime;
+the first argv entry is the program's name, and forgoing this, though acceptable by simexec, can break customary assumptions.
+for example, the true(1) implementation in the GNU coreutils suffers a segmentation fault if there is no argv[0].
+.PP
+While POSIX.1-2017 doesn't mandate there being an argv[0] per se a Strictly Conforming POSIX Application must pass an argv[0].
+It has also been said that those who do not pass an argv[0] are mean and nasty and smell of elderberries.
+.PP
+Simexec directly uses the execv library function. It cannot execute shell scripts intelligently (via shebang).
+It is inadviseable to use simexec as an alternative to simply calling a program, and in fact probably inadviseable to use simexec at all.
 
-.BR simexec (1)
-directly uses the
-.BR execv (3p)
-library function. It cannot execute shell scripts intelligently (via shebang).
-It is inadviseable to use
-.BR simexec (1)
-to simply execute a program when other methods would suffice.
-.\"
 .SH DIAGNOSTICS
 
-.BR simexec (1)
+Simexec returns the value of execv(3), which will be -1 (or 0xFF; 255) if an error occurs.
-exits with the returned value of
+This is not distinguishable from the executed program returning the same exit status.
-.BR execv (3p),
+.PP
-which will be 255 if an error occurs in execution, such as the binary not being
+Simexec will print a error message and return the proper sysexits(3) value if used in an invalid manner.
-found.
-This is indistinguishable from the executed binary exiting with the same
-status.
 
-Simexec will print a error message and return the proper
-.BR sysexits.h (3)
-value if invoked in an invalid manner.
-.\"
-.SH AUTHOR
-
-Written by DTB
-.MT trinity@trinity.moe
-.ME .
-.\"
 .SH COPYRIGHT
-.\"
+
-Copyright \(co 2022–2024 DTB. License AGPLv3+: GNU AGPL version 3 or later
+Public domain.
-<https://gnu.org/licenses/gpl.html>.
+
-.\"
 .SH SEE ALSO
-.BR execv (3p)
 
+exec(3)
+.PP
 The C89 standard's draft, section 2.1.2.2: "Hosted environment".
-
+.PP
 POSIX.1-2017 System Interfaces: execv. Particularly under the RATIONALE section header.

src/simexec.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022–2024 DTB <trinity@trinity.moe>
+ * Copyright (c) 2023 DTB <trinity@trinity.moe>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  *
  * This program is free software: you can redistribute it and/or modify it under
@@ -23,7 +23,8 @@
 char *program_name = "simexec";
 
 int main(int argc, char *argv[]){
-	if (argc < 2) {
+
+	if(argc < 2){
 		fprintf(stderr, "Usage: %s binary argv...\n",
 			argv[0] == NULL ? program_name : argv[0]
 		);