svn commit: r324952 - head/libexec/rtld-elf
Edward Tomasz Napierala
trasz at FreeBSD.org
Tue Oct 24 12:04:09 UTC 2017
Author: trasz
Date: Tue Oct 24 12:04:07 2017
New Revision: 324952
URL: https://svnweb.freebsd.org/changeset/base/324952
Log:
Replace lseek(2)/read(2) pair with pread(2), removing yet another syscall
from the binary startup code.
MFC after: 2 weeks
Sponsored by: DARPA, AFRL
Modified:
head/libexec/rtld-elf/rtld.c
Modified: head/libexec/rtld-elf/rtld.c
==============================================================================
--- head/libexec/rtld-elf/rtld.c Tue Oct 24 11:24:54 2017 (r324951)
+++ head/libexec/rtld-elf/rtld.c Tue Oct 24 12:04:07 2017 (r324952)
@@ -1824,10 +1824,9 @@ cleanup1:
if (dl > hint_stat.st_size)
goto cleanup1;
p = xmalloc(hdr.dirlistlen + 1);
-
- if (lseek(fd, hdr.strtab + hdr.dirlist, SEEK_SET) == -1 ||
- read(fd, p, hdr.dirlistlen + 1) !=
- (ssize_t)hdr.dirlistlen + 1 || p[hdr.dirlistlen] != '\0') {
+ if (pread(fd, p, hdr.dirlistlen + 1,
+ hdr.strtab + hdr.dirlist) != (ssize_t)hdr.dirlistlen + 1 ||
+ p[hdr.dirlistlen] != '\0') {
free(p);
goto cleanup1;
}
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