libc: expose execvpe for Linux compat

PR:		275370

(cherry picked from commit 8ccd0b8)

cddl/lib/libzfs/Makefile

@@ -99,6 +99,7 @@ CFLAGS+= -I${SRCTOP}/cddl/compat/opensolaris/include
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/module/icp/include
 CFLAGS+= -include ${SRCTOP}/sys/contrib/openzfs/include/os/freebsd/spl/sys/ccompile.h
 CFLAGS+= -DHAVE_ISSETUGID
+CFLAGS+= -DHAVE_EXECVPE
 CFLAGS+= -include ${SRCTOP}/sys/modules/zfs/zfs_config.h
 CFLAGS+= -DSYSCONFDIR=\"/etc\"
 CFLAGS+= -DPKGDATADIR=\"/usr/share/zfs\"

cddl/usr.sbin/zfsd/Makefile.common

@@ -22,8 +22,8 @@ CFLAGS+= -I${SRCTOP}/sys
 CFLAGS+= -include ${SRCTOP}/sys/contrib/openzfs/include/os/freebsd/spl/sys/ccompile.h
 CFLAGS+= -I${SRCTOP}/cddl/usr.sbin
 
-# use issetugid(2)
 CFLAGS+= -DHAVE_ISSETUGID
+CFLAGS+= -DHAVE_EXECVPE
 
 LIBADD+= devdctl zfs util geom bsdxml sbuf nvpair avl uutil zutil
 

include/unistd.h

@@ -504,6 +504,7 @@ int eaccess(const char *, int);
 void endusershell(void);
 int exect(const char *, char * const *, char * const *);
 int execvP(const char *, const char *, char * const *);
+int execvpe(const char *, char * const *, char * const *);
 int feature_present(const char *);
 char *fflagstostr(u_long);
 int getdomainname(char *, int);

lib/libc/gen/Symbol.map

@@ -457,6 +457,10 @@ FBSD_1.7 {
  __cpuset_free;
 };
 
+FBSD_1.8 {
+ execvpe;
+};
+
 FBSDprivate_1.0 {
  /* needed by thread libraries */
  __thr_jtable;

lib/libc/gen/exec.3

@@ -25,9 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\" @(#)exec.3 8.3 (Berkeley) 1/24/94
-.\"
-.Dd March 22, 2020
+.Dd December 11, 2023
 .Dt EXEC 3
 .Os
 .Sh NAME
@@ -37,6 +35,7 @@
 .Nm exect ,
 .Nm execv ,
 .Nm execvp ,
+.Nm execvpe ,
 .Nm execvP
 .Nd execute a file
 .Sh LIBRARY
@@ -58,6 +57,8 @@
 .Ft int
 .Fn execvp "const char *file" "char *const argv[]"
 .Ft int
+.Fn execvpe "const char *file" "char *const argv[]" "char *const envp[]"
+.Ft int
 .Fn execvP "const char *file" "const char *search_path" "char *const argv[]"
 .Sh DESCRIPTION
 The
@@ -99,6 +100,7 @@ The
 .Fn exect ,
 .Fn execv ,
 .Fn execvp ,
+.Fn execvpe ,
 and
 .Fn execvP
 functions provide an array of pointers to null-terminated strings that
@@ -112,9 +114,10 @@ be terminated by a
 pointer.
 .Pp
 The
-.Fn execle
+.Fn execle ,
+.Fn exect ,
 and
-.Fn exect
+.Fn execvpe
 functions also specify the environment of the executed process by following
 the
 .Dv NULL
@@ -136,6 +139,7 @@ Some of these functions have special semantics.
 The functions
 .Fn execlp ,
 .Fn execvp ,
+.Fn execvpe ,
 and
 .Fn execvP
 will duplicate the actions of the shell in searching for an executable file
@@ -146,6 +150,7 @@ For
 .Fn execlp
 and
 .Fn execvp ,
+.Fn execvpe ,
 search path is the path specified in the environment by
 .Dq Ev PATH
 variable.
@@ -271,7 +276,8 @@ The
 .Fn execl ,
 .Fn execle ,
 .Fn execlp ,
-.Fn execvp
+.Fn execvp ,
+.Fn execvpe ,
 and
 .Fn execvP
 functions
@@ -309,6 +315,9 @@ and
 functions
 conform to
 .St -p1003.1-88 .
+The
+.Fn execvpe
+function is a GNU extension.
 .Sh HISTORY
 The
 .Fn exec
@@ -332,6 +341,10 @@ The
 .Fn execvP
 function first appeared in
 .Fx 5.2 .
+The
+.Fn execvpe
+function first appeared in
+.Fx 15.0 .
 .Sh BUGS
 The type of the
 .Fa argv
@@ -342,6 +355,7 @@ parameters to
 .Fn exect ,
 .Fn execv ,
 .Fn execvp ,
+.Fn execvpe ,
 and
 .Fn execvP
 is a historical accident and no sane implementation should modify the provided

lib/libc/gen/exec.c

@@ -138,7 +138,7 @@ execv(const char *name, char * const *argv)
 int
 execvp(const char *name, char * const *argv)
 {
- return (_execvpe(name, argv, environ));
+ return (execvpe(name, argv, environ));
 }
 
 static int
@@ -290,7 +290,7 @@ execvP(const char *name, const char *path, char * const argv[])
 }
 
 int
-_execvpe(const char *name, char * const argv[], char * const envp[])
+execvpe(const char *name, char * const argv[], char * const envp[])
 {
  const char *path;
 

lib/libc/gen/posix_spawn.c

@@ -226,7 +226,7 @@ struct posix_spawn_args {
 #if defined(__i386__) || defined(__amd64__)
 /*
  * Below we'll assume that _RFORK_THREAD_STACK_SIZE is appropriately aligned for
- * the posix_spawn() case where we do not end up calling _execvpe and won't ever
+ * the posix_spawn() case where we do not end up calling execvpe and won't ever
  * try to allocate space on the stack for argv[].
  */
 #define _RFORK_THREAD_STACK_SIZE 4096
@@ -253,7 +253,7 @@ _posix_spawn_thr(void *data)
  }
  envp = psa->envp != NULL ? psa->envp : environ;
  if (psa->use_env_path)
- _execvpe(psa->path, psa->argv, envp);
+ execvpe(psa->path, psa->argv, envp);
  else
  _execve(psa->path, psa->argv, envp);
  psa->error = errno;

lib/libc/include/libc_private.h

@@ -422,9 +422,6 @@ int __sys_futimens(int fd, const struct timespec *times) __hidden;
 int __sys_utimensat(int fd, const char *path,
  const struct timespec *times, int flag) __hidden;
 
-/* execve() with PATH processing to implement posix_spawnp() */
-int _execvpe(const char *, char * const *, char * const *);
-
 int _elf_aux_info(int aux, void *buf, int buflen);
 struct dl_phdr_info;
 int __elf_phdr_match_addr(struct dl_phdr_info *, void *);