mirror of https://gerrit.osmocom.org/libosmocore
bsc_fd: Add a build option to be able to debug fd list corruption
bsc_register_fd on an already registered fd can corrupt the list in a heavy way and make the select end in an infinite loop, this code will workaround the issue and provide a way to set a breakpoint at the right position in the code.
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11
configure.in
11
configure.in
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@ -77,6 +77,17 @@ then
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AC_DEFINE([PANIC_INFLOOP],[1],[Use infinite loop on panic rather than fprintf/abort])
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fi
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AC_ARG_ENABLE(bsc_fd_check,
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[AS_HELP_STRING(
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[--enable-bsc-fd-check],
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[Instrument bsc_register_fd to check that the fd is registered]
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)],
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[fd_check=1], [fd_check=0])
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if test "x$fd_check" = "x1"
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then
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AC_DEFINE([BSC_FD_CHECK],[1],[Instrument the bsc_register_fd])
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fi
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AC_OUTPUT(
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libosmocore.pc
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12
src/select.c
12
src/select.c
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@ -19,6 +19,8 @@
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <osmocore/select.h>
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#include <osmocore/linuxlist.h>
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#include <osmocore/timer.h>
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@ -48,6 +50,16 @@ int bsc_register_fd(struct bsc_fd *fd)
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if (fd->fd > maxfd)
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maxfd = fd->fd;
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#ifdef BSC_FD_CHECK
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struct bsc_fd *entry;
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llist_for_each_entry(entry, &bsc_fds, list) {
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if (entry == fd) {
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fprintf(stderr, "Adding a bsc_fd that is already in the list.\n");
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return 0;
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}
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}
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#endif
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llist_add_tail(&fd->list, &bsc_fds);
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return 0;
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