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Index: head/usr.bin/elfdump/elfdump.1
===================================================================
--- head/usr.bin/elfdump/elfdump.1
+++ head/usr.bin/elfdump/elfdump.1
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd January 15, 2003
+.Dd November 5, 2018
.Dt ELFDUMP 1
.Os
.Sh NAME
@@ -34,7 +34,7 @@
files
.Sh SYNOPSIS
.Nm
-.Fl a | cdeGhinprs
+.Fl a | E | cdeGhinprs
.Op Fl w Ar file
.Ar file
.Sh DESCRIPTION
@@ -55,6 +55,11 @@
Dump dynamic symbols.
.It Fl e
Dump ELF header.
+.It Fl E
+Return success if
+.Ar file
+is an ELF file and failure if it is not.
+This option is exclusive with other options.
.It Fl G
Dump the GOT.
.It Fl h
Index: head/usr.bin/elfdump/elfdump.c
===================================================================
--- head/usr.bin/elfdump/elfdump.c
+++ head/usr.bin/elfdump/elfdump.c
@@ -60,6 +60,7 @@
#define ED_SHDR (1<<8)
#define ED_SYMTAB (1<<9)
#define ED_ALL ((1<<10)-1)
+#define ED_IS_ELF (1<<10) /* Exclusive with other flags */
#define elf_get_addr elf_get_quad
#define elf_get_off elf_get_quad
@@ -518,7 +519,7 @@
out = stdout;
flags = 0;
- while ((ch = getopt(ac, av, "acdeiGhnprsw:")) != -1)
+ while ((ch = getopt(ac, av, "acdEeiGhnprsw:")) != -1)
switch (ch) {
case 'a':
flags = ED_ALL;
@@ -529,6 +530,9 @@
case 'd':
flags |= ED_DYN;
break;
+ case 'E':
+ flags = ED_IS_ELF;
+ break;
case 'e':
flags |= ED_EHDR;
break;
@@ -566,7 +570,8 @@
}
ac -= optind;
av += optind;
- if (ac == 0 || flags == 0)
+ if (ac == 0 || flags == 0 || ((flags & ED_IS_ELF) &&
+ (ac != 1 || (flags & ~ED_IS_ELF) || out != stdout)))
usage();
if ((fd = open(*av, O_RDONLY)) < 0 ||
fstat(fd, &sb) < 0)
@@ -584,8 +589,12 @@
e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (e == MAP_FAILED)
err(1, NULL);
- if (!IS_ELF(*(Elf32_Ehdr *)e))
+ if (!IS_ELF(*(Elf32_Ehdr *)e)) {
+ if (flags & ED_IS_ELF)
+ exit(1);
errx(1, "not an elf file");
+ } else if (flags & ED_IS_ELF)
+ exit (0);
phoff = elf_get_off(e, e, E_PHOFF);
shoff = elf_get_off(e, e, E_SHOFF);
phentsize = elf_get_quarter(e, e, E_PHENTSIZE);
@@ -1254,6 +1263,7 @@
static void
usage(void)
{
- fprintf(stderr, "usage: elfdump -a | -cdeGhinprs [-w file] file\n");
+ fprintf(stderr,
+ "usage: elfdump -a | -E | -cdeGhinprs [-w file] file\n");
exit(1);
}

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