Don't ignore SIGCHLD.

Add function system_shell() to replace C library's sysstem().
Update WAITPID macro to handle EINTR.

configure.ac

@@ -209,6 +209,7 @@ AM_GNU_GETTEXT_VERSION([0.21])
 AX_CHECK_OPENSSL([ac_cv_have_openssl='yes'])
 
 AC_FUNC_FORK
+AC_FUNC_VFORK
 AC_FUNC_FSEEKO
 AC_PROG_GCC_TRADITIONAL
 

po/af.po

@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: coreutils 5.2.1\n"
 "Report-Msgid-Bugs-To: [email protected]\n"
-"POT-Creation-Date: 2024-05-25 23:49-0400\n"
+"POT-Creation-Date: 2024-05-27 06:37-0400\n"
 "PO-Revision-Date: 2004-03-17 11:58+0200\n"
 "Last-Translator: Petri Jooste <[email protected]>\n"
 "Language-Team: Afrikaans <[email protected]>\n"
@@ -113,7 +113,7 @@ msgstr ""
 msgid "Invalid range end"
 msgstr "%s: ongeldige reëlmatige uitdrukking: %s"
 
-#: lib/regcomp.c:158 src/aux.c:257 src/buf.c:443 src/buf.c:589 src/glbl.c:171
+#: lib/regcomp.c:158 src/aux.c:267 src/buf.c:443 src/buf.c:589 src/glbl.c:171
 #: src/io.c:318 src/page.c:858 src/parse.c:273 src/parse.c:518 src/re.c:157
 #: src/undo.c:26
 #, fuzzy
@@ -144,50 +144,50 @@ msgstr ""
 msgid "No previous regular expression"
 msgstr "fout in soektog met reëlmatige uitdrukking"
 
-#: src/aux.c:27
+#: src/aux.c:25 src/cmds.c:339
 msgid "Child process error"
 msgstr ""
 
-#: src/aux.c:32
+#: src/aux.c:40 src/cmds.c:346
 #, c-format
 msgid "Exit status: %#x"
 msgstr ""
 
-#: src/aux.c:60
+#: src/aux.c:69
 #, fuzzy
 #| msgid "write error"
 msgid "Flush error"
 msgstr "skryffout"
 
-#: src/aux.c:71 src/aux.c:161
+#: src/aux.c:80 src/aux.c:170
 #, fuzzy
 #| msgid "write error"
 msgid "Pipe open error"
 msgstr "skryffout"
 
-#: src/aux.c:80 src/aux.c:132
+#: src/aux.c:89 src/aux.c:141 src/cmds.c:318
 #, fuzzy
 msgid "Fork error"
 msgstr "leesfout"
 
-#: src/aux.c:175
+#: src/aux.c:184
 msgid "Pipe close error"
 msgstr ""
 
-#: src/aux.c:202
+#: src/aux.c:212
 msgid "Exceeded maximum stack frame depth"
 msgstr ""
 
-#: src/aux.c:218 src/aux.c:232 src/aux.c:286 src/aux.c:326 src/aux.c:365
-#: src/io.c:58 src/io.c:601 src/io.c:935 src/io.c:982 src/io.c:1041
-#: src/io.c:1051 src/io.c:1110 src/io.c:1119 src/io.c:1146 src/main.c:230
+#: src/aux.c:228 src/aux.c:242 src/aux.c:296 src/aux.c:336 src/aux.c:375
+#: src/io.c:58 src/io.c:602 src/io.c:936 src/io.c:983 src/io.c:1042
+#: src/io.c:1052 src/io.c:1111 src/io.c:1120 src/io.c:1147 src/main.c:230
 #: src/main.c:731 src/main.c:793
 #, fuzzy
 #| msgid "write error"
 msgid "File seek error"
 msgstr "skryffout"
 
-#: src/aux.c:268 src/aux.c:311 src/aux.c:350 src/buf.c:120
+#: src/aux.c:278 src/aux.c:321 src/aux.c:360 src/buf.c:120
 #, fuzzy
 msgid "dup2 error"
 msgstr "leesfout"
@@ -229,7 +229,7 @@ msgstr ""
 msgid "Buffer write error"
 msgstr "skryffout"
 
-#: src/buf.c:507 src/exec.c:100 src/exec.c:129 src/exec.c:1889 src/page.c:301
+#: src/buf.c:507 src/exec.c:100 src/exec.c:129 src/exec.c:1873 src/page.c:301
 #: src/parse.c:223
 #, fuzzy
 #| msgid "character out of range"
@@ -254,7 +254,7 @@ msgstr ""
 msgid "Decryption failed (incomplete block)."
 msgstr ""
 
-#: src/cbc.c:384 src/io.c:552 src/io.c:810
+#: src/cbc.c:384 src/io.c:553 src/io.c:811
 #, fuzzy
 #| msgid "write error"
 msgid "File read error"
@@ -294,7 +294,7 @@ msgid "Command prefix unexpected"
 msgstr ""
 
 #: src/exec.c:494 src/exec.c:637 src/exec.c:741 src/exec.c:762 src/exec.c:961
-#: src/exec.c:1003 src/exec.c:1348 src/exec.c:1541 src/exec.c:1751
+#: src/exec.c:1003 src/exec.c:1348 src/exec.c:1541 src/exec.c:1735
 msgid "Address unexpected"
 msgstr ""
 
@@ -328,21 +328,21 @@ msgid "Invalid register"
 msgstr "ongeldige gebruiker"
 
 #: src/exec.c:1179 src/exec.c:1242 src/exec.c:1560 src/exec.c:1619
-#: src/exec.c:1814 src/exec.c:1829
+#: src/exec.c:1798 src/exec.c:1813
 #, fuzzy
 msgid "Unknown command"
 msgstr "Onbekende stelselfout"
 
-#: src/exec.c:1829
+#: src/exec.c:1813
 #, fuzzy
 msgid "Invalid address"
 msgstr "%s: ongeldige reëlmatige uitdrukking: %s"
 
-#: src/exec.c:1847
+#: src/exec.c:1831
 msgid "Command too long"
 msgstr ""
 
-#: src/exec.c:1894
+#: src/exec.c:1878
 #, fuzzy
 msgid "Invalid address range"
 msgstr "%s: ongeldige reëlmatige uitdrukking: %s"
@@ -355,18 +355,18 @@ msgstr ""
 msgid "File does not exist"
 msgstr ""
 
-#: src/io.c:97 src/io.c:166 src/io.c:632 src/io.c:681 src/main.c:781
+#: src/io.c:97 src/io.c:166 src/io.c:633 src/io.c:682 src/main.c:781
 #, fuzzy
 #| msgid "write error"
 msgid "File open error"
 msgstr "skryffout"
 
-#: src/io.c:120 src/io.c:646
+#: src/io.c:120 src/io.c:647
 #, c-format
 msgid "%s: File already locked\n"
 msgstr ""
 
-#: src/io.c:144 src/io.c:623 src/io.c:661
+#: src/io.c:144 src/io.c:624 src/io.c:662
 msgid "File close error"
 msgstr ""
 
@@ -380,37 +380,37 @@ msgstr ""
 msgid "Newline appended\n"
 msgstr ""
 
-#: src/io.c:608 src/io.c:1153
+#: src/io.c:609 src/io.c:1154
 #, fuzzy
 #| msgid "write error"
 msgid "File truncate error"
 msgstr "skryffout"
 
-#: src/io.c:722
+#: src/io.c:723
 msgid "File too big"
 msgstr ""
 
-#: src/io.c:769 src/io.c:789 src/io.c:800 src/main.c:742 src/main.c:750
+#: src/io.c:770 src/io.c:790 src/io.c:801 src/main.c:742 src/main.c:750
 #, fuzzy
 #| msgid "write error"
 msgid "File write error"
 msgstr "skryffout"
 
-#: src/io.c:833 src/parse.c:505
+#: src/io.c:834 src/parse.c:505
 msgid "File status error"
 msgstr ""
 
-#: src/io.c:840
+#: src/io.c:841
 msgid "Access restricted to regular files"
 msgstr ""
 
-#: src/io.c:909
+#: src/io.c:910
 #, fuzzy
 #| msgid "write error"
 msgid "File stat error"
 msgstr "skryffout"
 
-#: src/io.c:1016
+#: src/io.c:1017
 msgid "Cannot append register to itself."
 msgstr ""