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if islogin, execfn = shell

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Prior to this, execfn was not being properly set for login shells that
did not receive `$_`, which was the case for iTerm2 on Mac. There were
no observable consequences of this, but fixing it seems good anyway.
This commit is contained in:
Jōshin 2023-12-03 21:56:41 -05:00
parent dc128b0f59
commit ab96e08a65
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1 changed files with 14 additions and 14 deletions
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28
ape/ape-m1.c
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@ -947,8 +947,21 @@ int main(int argc, char **argv, char **envp) {
M->lib.dlclose = dlclose;
M->lib.dlerror = dlerror;
/* getenv("_") is close enough to at_execfn */
/* there is a common convention of shells being told that they
are login shells via the OS prepending a - to their argv[0].
the APE system doesn't like it when argv[0] is not the full
path of the binary. to rectify this, the loader puts a "-l"
flag in argv[1] and ignores the dash. */
if ((islogin = argc > 0 && *argv[0] == '-' && (shell = GetEnv(envp, "SHELL"))
&& !StrCmp(argv[0] + 1, BaseName(shell)))) {
execfn = shell;
dash_l = __builtin_alloca(3);
memmove(dash_l, "-l", 3);
} else {
execfn = argc > 0 ? argv[0] : 0;
}
/* getenv("_") is close enough to at_execfn */
for (i = 0; envp[i]; ++i) {
if (envp[i][0] == '_' && envp[i][1] == '=') {
execfn = envp[i] + 2;
@ -959,21 +972,9 @@ int main(int argc, char **argv, char **envp) {
sp = (long *)(argv - 1);
auxv = (long *)(envp + i + 1);
/* there is a common convention of shells being told that they
are login shells via the OS prepending a - to their argv[0].
the APE system doesn't like it when argv[0] is not the full
path of the binary. to rectify this, the loader puts a "-l"
flag in argv[1] and ignores the dash. */
islogin = argc > 0 && *argv[0] == '-' && (shell = GetEnv(envp, "SHELL")) &&
!StrCmp(argv[0] + 1, BaseName(shell));
/* create new bottom of stack for spawned program
system v abi aligns this on a 16-byte boundary
grows down the alloc by poking the guard pages */
if (islogin) {
dash_l = __builtin_alloca(3);
}
n = (auxv - sp + islogin + AUXV_WORDS + 1) * sizeof(long);
sp2 = (long *)__builtin_alloca(n);
if ((long)sp2 & 15) ++sp2;
@ -982,7 +983,6 @@ int main(int argc, char **argv, char **envp) {
}
if (islogin) {
memmove(sp2, sp, 2 * sizeof(long));
memmove(dash_l, "-l", 3);
*((char **)sp2 + 2) = dash_l;
memmove(sp2 + 3, sp + 2, (auxv - sp - 2) * sizeof(long));
++argc;